Balluff LRP2000 Pass Through System User Manual testcov
BALLUFF inc Pass Through System testcov
Balluff >
Contents
- 1. Manual Part1
- 2. Manual Part2
Manual Part2
RFID Interface
LRP2000 Long Range Passice Reader/Writer 79
*******************************************************************************
ABxS Command 8BH: Write Family Code All
DESCRIPTION
This command can be used to write the Family Code of all tags in the
field. It can also be used to selectively rewrite the family codes of tags
with Family Codes already set to a particular value.
The command is formatted as shown below.
Field Remarks
Command Command number in hex preceded
by AAH
Current Family Code Current Tag Family Code
Reserved 00H
Timeout Timeout value given in 1 ms units
(001EH - FFFEH)
New Family Code The value which will be written to
the FamilyCodes of all the
addressed tags
Message Terminator FFFFH
Example
This example will change the Family code depending on the current
value of the family code. Two tags are found with Family Code 02H
and they are changed to 03H.
Command from hoast Response from controller
MSB LSB Remarks MSB LSB Remarks
AAH 8BH Perform
Command 8BH
AAH 8BH Command
Echo
02H 00H Family ID/
Reserved
02H 00H Ntags/Status
07H D0H 2 second Timeout FFH FFH Message
Terminator
00H 03H new family code
FFH FFH Message
Terminator
RFID Interface
80 LRP820S-Series Long-Range Passive Reader/Writers
*******************************************************************************
ABxS Command 8CH: Lock Family Code All
DESCRIPTION
This command locks the family codes of tags in the field. Once locked,
the Family Codes cannot be changed or unlocked.
DISCUSSION
The command must pass a family code to select the tags whose
family code will be locked. The controller will return a response when
the timeout period expires. The parameter of the response in the
number of tags written.
The command is formatted as shown below.
Field Remarks
Command Command number in hex preceded
by AAH
Family Code Family Code, 00H = all tags
Reserved 00H
Timeout Timeout value given in 1 ms units
(001EH - FFFEH)
Message Terminator FFFFH
Example
This example will lock the Family Code on all tags with the Family
Code of 02H. Two tags are found and locked.
Command from host Response from controller
MSB LSB Remarks MSB LSB Remarks
AAH 8CH Perform
Command 8CH
AAH 8BH Command
Echo
02H 00H Family ID/
Reserved
02H 00H Ntags/Status
07H D0H 2 second Timeout FFH FFH Message
Terminator
RFID Interface
LRP2000 Long Range Passice Reader/Writer 81
*******************************************************************************
ABxS Command 8DH: Start/Stop Continuous Read
All
DESCRIPTION
Starts and stops Continuous Read All mode for multiple tags.
DISCUSSION
The Start/Stop Continuous Read All mode is set by the length byte. To
start Continuous Read All mode send the command with valid, non-
zero value for the length of the read . Stop the mode by sending the
command with a read length of 0. While in this mode, any other
command can be issued and it will be handled properly. After
processing the new command, the controller will resume the
Continuous Read All mode. The command has a parameter, tag
repeat count, that can prevent multiple reads of the same tag. A tag is
not read a second time until a specified number of tags have been
read since it was last read. Allowed values are from 0 to 255 (FFH),
where 0 means the tag can be re-read anytime. When Continuous
Read All mode is interrupted with other commands, the tag repeat
count is saved during execution of the other commands such that all
tags will respond to the interrupting command. When the controller
resumes continuous reading, the tag repeat count will be restored.
The controller will respond with an acknowledge packet followed by
data packets for each tag read. CONFIG LED blinks after each packet
transmission.
FFH FFH Message
Terminator
Field Remarks
Command Command number in hex
preceded by AAH
Family ID Tag Family ID - 00H = all tags
Reserved 00H
Start Address Tag address for the start of the
read
Read Length nonzero = start, 0000H = stop
Command from host Response from controller
MSB LSB Remarks MSB LSB Remarks
RFID Interface
82 LRP820S-Series Long-Range Passive Reader/Writers
Example
Reads 4 bytes of data from the tag starting at address 0001H.
TheFamily ID byte is set to zero so all tags will be read. The Tag
Repeat Count is set to 20 (14H). Three tags respond with read data.
Command from host Response from controller
MSB LSB Remarks MSB LSB Remarks
AAH 8DH Perform Command 8D AAH 8DH Command
Echo
00H 00H Tag Family 00/Reserved FFH FFH Message
Terminator
00H 01H Start Address
00H 04H Read Length
00H 14H Tag Delay
FFH FFH Message Terminator
After the controller sends the acknowledgment, it will send the read
data from the 3 tags.
Data response from controller
Tag Delay Number of tag that must be read
before the same tag will be read
again(0-255)
Message Terminator FFFFH
MSB LSB Remarks
AAH 8DH Command Echo/
Tag 1
00H 30H Data byte 1/Tag 1
00H 31H Data byte 2/Tag 1
00H 32H Data byte 3/Tag 1
00H 33H Data byte 4/Tag 1
FFH FFH Terminator/ Tag 1
AAH 8DH Command Echo/
Tag 2
00H 40H Data byte 1/Tag 2
00H 41H Data byte 2/Tag 2
Field Remarks
RFID Interface
LRP2000 Long Range Passice Reader/Writer 83
*******************************************************************************
ABxS Command 8EH: Memory Lock All
DESCRIPTION
This command locks contiguous blocks of read-write memory. Once
Bytes are locked, they cannot be written to, nor can they be unlocked.
DISCUSSION
The memory can be locked only in contiguous blocks. The command
passes one parameter for the first block and another parameter for the
number of blocks to be locked. This is one of only two ABx
commands which address the memory of the tag using these
parameters. The block structure of the tags is governed by the ISO-
15693 specification. ABx command 15H can be used to obtain the
memory organization for a particular tag. Attempting to write to locked
Bytes will return a Write Security Error.
The command is formatted as shown below.
00H 42H Data byte 3/Tag 2
00H 43H Data byte 4/Tag 2
FFH FFH Terminator/ Tag 2
AAH 8DH Command Echo/
Tag 3
00H 34H Data byte 1/Tag 3
00H 35H Data byte 2/Tag 3
00H 36H Data byte 3/Tag 3
Field Remarks
Command Command number in hex
preceded by AAH
Family Code Tag Family ID - 00H = all tags
Reserved 00H
Timeout Timeout value given in 1 ms units
(001EH - FFFEH)
First Block First block of memory to lock
Number of blocks Number of contiguous blocks of
memory to lock
MSB LSB Remarks
RFID Interface
84 LRP820S-Series Long-Range Passive Reader/Writers
Example
This example will lock blocks 0-8 on all tags in range with the Family
ID of 02H. Two tags are found and locked.
Command from host Response from controller
MSB LSB Remarks MSB LSB Remarks
AAH 8EH Perform
Command 8E
AAH 8EH Command
Echo
02H 00H Family ID/
Reserved
02H 08H Ntag/Status
07H D0H 2 second timeout FFH FFH Message
Terminator
00H 08H Lock
Configuration
FFH FFH Message
Terminator
Message Terminator FFFFH
Field Remarks
RFID Interface
LRP2000 Long Range Passice Reader/Writer 85
*******************************************************************************
ABxS Command 94H: SN Fill
DESCRIPTION
Fills only the RFID tag specified by serial number with a one byte
value over multiple contiguous addresses.
DISCUSSION
This command is commonly used to clear an RFID tag's memory. It
writes a one byte value repetitively across a specified range of tag
addresses. Only the tag with the specified serial number will be
affected by this command. The controller will return a response after
the successful fill operation or when the timeout expires. The fill
function requires a Family ID and a Serial Number, one data value
byte, a starting address, and a fill length. It fills the specified tag with
the data value byte, starting at the specified start address for the
specified number of consecutive bytes. When Fill Length is set to 0,
the controller will write fill data from the start address to the end of the
tag's memory. The timeout value is given in 1 msec increments and
can have a value of 001EH to FFFEH (65,534 ms). When the timeout
is set to 0, the controller will return a syntax error. It returns a
response when done or when the timeout expires.
Field Remarks
Command Command number in hex preceded
by AAH
Family Code Tag Family ID - 00H = all tags
Reserved 00H
Start Address The tag address where the fill will
start
RFID Interface
86 LRP820S-Series Long-Range Passive Reader/Writers
A response to a successful command will follow this form.
Field Remarks
Command Echo Command number in hex
preceded by AAH
Number of Tags filled 0 = tag not found, 1 = tag filled
Command Status One byte Error status
Message Terminator FFFFH
Example
Writes 'A' (41H) to a single tag, starting at tag address 0005H for the
following next consecutive 40 bytes. The Family Code is set to 00H. A
timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for
the completion of the command.
Fill Length The number of tag addresses to be
filled
Timeout Timeout value given in 1 ms units
(001EH - FFFEH)
Tag Serial Number The 8-byte serial number
Data Value Byte The byte used to fill
Message Terminator FFFFH
Command from host Response from controller
MSB LSB Remarks MSB LSB Remarks
AAH 94H Perform
Command 94
AAH 94H Command
Echo
00H 00H Family ID/
Reserved
01H 00H Ntag/Status
00H 05H Start Address FFH FFH Message
Terminator
00H 28H Fill Length
07H D0H Timeout
00H 01H SN byte 0
00H ACH SN byte 1
00H 42H SN byte 2
Field Remarks
RFID Interface
LRP2000 Long Range Passice Reader/Writer 87
*******************************************************************************
ABxS Command 95H: SN Block Read
DESCRIPTION
Read a block of data from a specified RFID tag.
DISCUSSION
This command is used to read segments of data from contiguous
areas of tag memory. It is capable of handling up to 48 bytes of data
transferred to the host with one command if there is no tag Family ID.
The timeout value is given in 1 msec increments and can have a value
of 001EH to FFFEH (65,534 ms). When the timeout is set to 0, the
controller will return a syntax error. The SN Block Read consists of a
serial number, a start address and length, followed by a timeout value.
The 8-byte serial number of the target tag is specified. If the read
length exceeds the last tag address, the controller will return error
message in the status byte. It returns a response when done or when
the timeout expires. The data read from the tag is returned in the LSB
of the register, and the MSB is always 00H. A special error packet
(AAH FFH) is sent if the timeout expires.
00H D0H SN byte 3
00H 27H SN
byte 4
00H
1CH SN byte
5
00H
65H SN byte
6
00H
33H SN byte
7
00H
41H Fill
byte
FFH FFH
Message
Terminator
Field Remarks
Command Command number in hex preceded
by AAH
Ta g Fa m i l y Tag Family ID - 00H = all tags
Command from host Response from controller
MSB LSB Remarks MSB LSB Remarks
RFID Interface
88 LRP820S-Series Long-Range Passive Reader/Writers
Example
Reads 4 bytes of data from the tag specified by serial number starting
at address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec
increments) is set for the completion of the SN Block Read. The
Family ID byte is set to zero.
Reserved 00H
Start Address The tag address where the read
will start
Read Length The numbers of tag addresses to
be read
Timeout Timeout value given in 1 ms units
(001EH - FFFEH)
Tag Serial Number 8-byte tag serial number
Message Terminator FFFFH
Command from host Response from controller
MSB LSB Remarks MSB LSB Remarks
AAH 95H Perform
Command 95
AAH 95H Command
Echo
00H 00H Tag Family 00/
Reserved
00H 30H Data byte 1
00H 01H Start Address 00H 31H Data byte 2
00H 04H Read Length 00H 32H Data byte 3
07H D0H Timeout 00H 33H Data byte 4
00H ABH SN byte 0 01H 00H Ntag/Status
00H 02H SN byte 1 FFH FFH Message
Terminator
00H F3H SN byte 2
00H 55H SN byte 3
00H C5H SN byte 4
00H 2DH SN byte 5
00H 41H SN byte 6
00H A0H SN byte 7
Field Remarks
RFID Interface
LRP2000 Long Range Passice Reader/Writer 89
*******************************************************************************
ABxS Command 96 (96H): SN Block Write
DESCRIPTION
Write a block of data to a single RFID tag specified by its serial
number.
DISCUSSION
This command is used to write segments of data to contiguous areas
of tag memory. It is capable of transferring up to 1 kByte of data
transferred from the host to the controller in a single command. The
timeout value is given in 1 msec increments and can have a value of
001EH to FFFEH (65,534 ms). When the timeout is set to 0, the
controller will return a syntax error. The SN BlockWrite consists of a
Family ID, Serial Number and start address followed by the data
stream to be written to the RFID tag. If the write range exceeds the
last tag address, the controller will return a syntax error, 21H. It
returns a response when done or when the timeout expires. The data
to be written to the tag is contained in the LSB of the register, and the
MSB is always 00H.
FFH FFH Message
Terminator
Command from host Response from controller
MSB LSB Remarks MSB LSB Remarks
Field Remarks
Command Command number in hex preceded
by AAH
Family ID Tag Family ID - 00H = all tags
Reserved 00H
Start Address The tag address where the write will
start
Number of Bytes The number of tag addresses to be
written to
Timeout Timeout value given in 1 ms units
(001EH - FFFEH)
Tag Serial Number 8-Byte tag serial number
Write Data The data to be written (1 Byte to
1kByte)
Message Terminator FFFFH
RFID Interface
90 LRP820S-Series Long-Range Passive Reader/Writers
Example
Writes 4 bytes of data, starting at address 0001H. A timeout of 2
seconds (07D0H = 2000 x 1 msec increments) is set for the
completion of the Block Write. The Family ID Code is set to 00H.
Command from host Response from controller
MSB LSB Remarks MSB LSB Remarks
AAH 96H Perform
Command 96
AAH 96H Command
Echo
02H 00H Tag Family 02/
reserved
01H 00H Ntags/Status
00H 01H Start Address FFH FFH Message
Terminator
00H 04H Write Length
07H D0H Timeout
00H A4H SN byte 0
00H 6CH SN byte 1
00H 18H SN byte 2
00H 92H SN byte 3
00H 2DH SN byte 4
RFID Interface
LRP2000 Long Range Passice Reader/Writer 91
*******************************************************************************
ABxS Command 10H: Set Output
DESCRIPTION
Set the states of the output lines and output LEDs "A" through "D."
DISCUSSION
This command will set the state of the digital output lines using a one-
Byte parameter, Output Status. The least significant nibble of the
Output Status Byte will determine the status of the outputs. The least
significant bit of this nibble corresponds to Output A. The most
significant bit of this nibble corresponds to Output D. The most
significate nibble of the Output Status Byte is reserved and should be
set to 0H. An output bit set to one will turn the corresponding LED on
and close the electronic switch of the output, allowing current to flow
through the output circuit. An output bit reset to zero will turn the
corresponding LED off and open the electronic switch in the output
00H 34H SN byte 5
00H DEH SN byte 6
00H 20H SN byte 7
00H 40H Data byte 1
00H 41H Data byte 2
00H 42H Data byte 3
00H 43H Data byte 4
FFH FFH Message
Terminator
Command from host Response from controller
MSB LSB Remarks MSB LSB Remarks
RFID Interface
92 LRP820S-Series Long-Range Passive Reader/Writers
circuit. The following chart shows the hex values for all combinations
of Output Status Bytes. To reset all output bits, issue the command
with 00H for the Output Status Byte.
MSB LSB Remarks LSB Bit 3
Output D
LSB Bit 2
Output C
LSB Bit 1
Output B
LSB Bit 0
Output A
00H 00H Reset A, B, C,
D
0 0 0 0
00H 01H Set Output A -
Reset B, C, D
0 0 0 1
00H 02H Set Output B -
Reset A, C, D
0 0 1 0
00H 03H Set Output A,
B - Reset C, D
00 1 1
00H 04H Set Output C -
Reset A, B, D
0 1 0 0
00H 05H Set Output A,
C - Reset B, D
01 0 1
00H 06H Set Output B,
C - Reset A, D
01 1 0
00H 07H Set Output A,
B, C - Reset D
0 1 1 1
00H 08H Set Output D -
Reset A, B, C
1 0 0 0
00H 09H Set Output A,
D - Reset B, C
1 00 1
00H 0AH Set Output B,
D - Reset A, C
10 1 0
00H 0BH Set Output A,
B, D - Reset C
1 0 1 1
00H 0CH Set Output C,
D - Reset A, B
1 1 0 0
00H 0DH Set Output A,
C, D - Reset B
1 1 0 1
00H 0EH Set Output B,
C, D - Reset A
1 1 1 0
00H 0FH Set Output A,
B, C, D
1 1 1 1
Field Remarks
Command Command number in hex preceded by AAH
Output Pattern Hex value for the bit output settings
RFID Interface
LRP2000 Long Range Passice Reader/Writer 93
Example
The following example sets Output B only and resets A, C, and D.
Command from host Response from controller
MSB LSB Remarks MSB LSB Remarks
AAH 10H Perform
Command 10
AAH 10H Command echo
00H 02H Set Output B FFH FFH Message
Terminator
FFH FFH Message
Terminator
*******************************************************************************
ABxS Command 11H: Input Status
DESCRIPTION
Returns the status of User Inputs.
DISCUSSION
This command will interrogate the state of the User Input lines and
return a one-Byte parameter, Input Status. The least significant nibble
of the Input Status Byte is determined by the status of the outputs.
The least significant bit of this nibble corresponds to Input A. The
most significant bit of this nibble corresponds to Input D. The most
significate nibble of the Input Status Byte will be set to 0H. A closed
circuit in one of the User Inputs will set the corresponding User Input
bit to one, turning the corresponding LED on. An open circuit in one of
Message Terminator FFFFH
Field Remarks
RFID Interface
94 LRP820S-Series Long-Range Passive Reader/Writers
the User Inputs will set the corresponding User Input bit to zero,
turning off the corresponding LED. The following chart shows all of
the valid hex values for the Input Status bytes.
MSB LSB Remarks LSB Bit 3
Input D
LSB Bit 2
Input C
LSB Bit 1
Input B
LSB Bit 0
Input A
00H 00H Inputs A, B, C, D,
OFF
0 0 0 0
00H 01H Input A, ON - B, C,
D, OFF
0 0 0 1
00H 02H Input B, ON - A, C,
D, OFF
0 0 1 0
00H 03H Input A, B, ON - C,
D, OFF
0 0 1 1
00H 04H Input C, ON - A, B,
D, OFF
0 1 0 0
00H 05H Input A, C, ON - B,
D, OFF
0 1 0 1
00H 06H Input B, C, ON - A,
D, OFF
0 1 1 0
00H 07H Input A, B, C, ON -
D, OFF
0 1 1 1
00H 08H Input D, ON - A, B,
C, OFF
1 0 0 0
00H 09H Input A, D, ON - B,
C, OFF
1 0 0 1
00H 0AH Input B, D, ON - A,
C, OFF
1 0 1 0
00H 0BH Input A, B, D, ON -
C, OFF
1 0 1 1
00H 0CH Input C, D, ON - A,
B, OFF
1 1 0 0
00H 0DH Input A, C, D, ON -
B, OFF
1 1 0 1
00H 0EH Input B, C, D, ON -
A, OFF
1 1 1 0
00H 0FH Input A, B, C, D,
ON
1 1 1 1
Field Remarks
Command Command number in hex preceded by AAH
Message Terminator FFFFH
RFID Interface
LRP2000 Long Range Passice Reader/Writer 95
Example
The following example shows only Input B is ON.
Command from host Response from controller
MSB LSB Remarks MSB LSB Remarks
AAH 11H Perform
Command 11
AAH 11H Command echo
FFH FFH Message
Terminator
00H 02H Input B ON
FFH FFH Message
Terminator
6.4 Abx Fast Protocol
The ABx Fast protocol differs from the Abx Standard Protocol in that
the atomic data element is a Byte instead of a 16-bit word. ABx Fast
commands and responses also contain a two-Byte word to indicate
the size of the packet being sent. ABx Fast also supports the use of a
one-Byte checksum.
Packet Size
The ABx Fast protocol requires that the size of the packet be included
following the terminator in every packet. All parameters and data
between the packet size Byte and the checksum (if used) or
terminator Bytes (if not using the checksum) must be accounted for in
the packet size word. The packet size will be the same with, or
without, a checksum.
Checksum
The optional checksum must be enabled from the operating mode
menu to be available. The checksum is calculated by adding all the
Byte values in the packet (less the values in the header, checksum if
present, and terminator), discarding Byte overflow and subtracting the
Byte sum from FFH. Thus, when the packet length through the
checksum are added as Byte values, the sum will be FFH.
RFID Interface
96 LRP820S-Series Long-Range Passive Reader/Writers
Example
The following is a typical command using a checksum.
Field Contents
Header 0202H
Command Size 0003H
Command Code 01H
Timeout 07D0H
Checksum 24H
Terminator 03H
The summed values begin with the Command Size and end with the
timeout value. That sum, less overflow, is subtracted from FFH for the
checksum value.
Thus:
00H + 03H + 01H + 07H + D0H = DBH
FFH - DBH = 24H
ABx Fast Single-tag Command Structure:
Field Number
of Bytes Content
Header 2 0202H
Command Size 2Packet length in Bytes excluding the
header, command size, checksum and
terminator Bytes.
Command 1 Command Code
Byte Addresses 4 The first two Bytes give the start
address. The second two Bytes give
the length of the address range. Not
used on 07H, 08H, 14H, 15H, 16H
Block Addresses 2The first Byte gives the address of the
first block. The second Byte gives the
number of blocks to be interrogated.
Only used with command 14H.
Timeout 2 0001H to FFFEH milliseconds
Data varies command data
Checksum 1 Optional Checksum
Sum these values to
calculate the checksum
RFID Interface
LRP2000 Long Range Passice Reader/Writer 97
ABx Fast Multi-tag Command structure
Field Number
of Bytes Content
Header 2 0202H
Command Size 2Packet length in Bytes excluding the
header, command size, checksum and
terminator Bytes.
Command 1Command Code
Family code 1 00H to address all tags in field
Reserved 1Reserved for future use, set to 00H
Address 4The first two Bytes give the start
address. The second two Bytes give the
length of the address range Not used on
87H, 88H, 8EH, 8BH, 8CH
Block Addresses 2The first Byte gives the address of the
first block. The second Byte gives the
number of blocks to be
interrogated.Only used with command
14H
Timeout 20001H to FFFEH milliseconds
Data varies command data
Checksum 1 Optional Checksum
Terminator 1 03H
Terminator 1 03H
Field Number
of Bytes Content
RFID Interface
98 LRP820S-Series Long-Range Passive Reader/Writers
*******************************************************************************
ABx Fast Command 04H: Fill Tag
DESCRIPTION
Fill an RFID tag with a one Byte value over multiple contiguous
addresses.
DISCUSSION
This command is commonly used to clear an RFID tag's memory. It
writes a one-Byte value repetitively across a specified range of tag
addresses. The fill function requires one data value Byte, a starting
address, and a fill length. It will fill the tag with the data value Byte,
starting at the specified start address for the specified number of
consecutive Bytes. When Fill Length is set to 0, the controller will write
fill data from the start address to the end of the tag's memory. The
timeout value is given in 1 msec increments and can have a value of
1EH to FFFEH (65,534 ms). When the timeout is set to 0, the
controller will return a syntax error. When the Fill Length extends
beyond the last Byte in the tag, the controller will return error 21H
.
Field Content
Header 0202H
RFID Interface
LRP2000 Long Range Passice Reader/Writer 99
A response to a successful command will follow this form.
Field Content
Header 0202H
Command Size Packet length in Bytes excluding the header,
command size, checksum and terminator Bytes.
Command echo 04H
Checksum Optional Checksum
Terminator 03H
Example
Writes 'A' (41H) to the tag starting at address 0005H and continuing
for the next consecutive 40 Bytes. A timeout of 2 seconds (07D0H
=2000 x 1 msec increments) is set for the completion of the
configuration.
Command Size Packet length in Bytes excluding the header,
command size, checksum and terminator
Bytes. 0008H for this command.
Command 04H
Start Address 2-Byte value for the starting tag address
Number of Bytes 2-Byte value for the length of the fill in number of
Bytes
Timeout 2-Byte value for timeout in 1 ms units. (1EH -
FFFEH) Bytes
Data value Byte 1 Byte value to be written to all the adddressed
Bytes
Checksum Optional Checksum
Terminator 03H
Command from host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command
Size
0008H Response
Size
0001H
Field Content
RFID Interface
100 LRP820S-Series Long-Range Passive Reader/Writers
*******************************************************************************
ABx Fast Command 05H: Block Read
DESCRIPTION
Reads a block of data from an RFID tag.
DISCUSSION
This command is used to read segments of data from contiguous
areas of tag memory. It is capable of handling up to 1 kByte of data
transferred to the host. The timeout value is given in 1 msec
increments and can have a value of 1EH to FFFEH (65,534 ms).
When the timeout is set to 0, the controller will return error 21H,
Command
Code
04H Command
Echo
04H
Start address 0005H Checksum FAH
Block Size 0028H Terminators 03H
Timeout, 2
seconds
07D0H
Data Value
Byte
41H
Checksum AEH
Terminators 03H
Command from host Response from controller
Field Content Field Content
RFID Interface
LRP2000 Long Range Passice Reader/Writer 101
syntax error. The Block Read consists of a start address and length,
followed by a timeout value and a message terminator as shown
below.
Field Content
Header 0202H
Command Size Packet length in Bytes excluding the header,
command Size, checksum and terminator Bytes.
0007H for this command
Command 05H
Start Address 2-Byte value for the starting tag address
Number of Bytes 2-Byte value for the length of the read in number
of Bytes
Timeout 2-Byte value for timeout in 1 ms units. (1EH -
FFFEH)
Checksum Optional Checksum
Terminator 03H
Example
Reads 4 Bytes of data from the tag starting at address 0001H. A
timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for
the completion of the Block Read.
Command from host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 0007H Response Size 0005H
Command Code 05H Command Echo 05H
Start address 0001H Data fromaddress
0001H
05H
Number of Bytes 0004H Data from address
0002H
AAH
RFID Interface
102 LRP820S-Series Long-Range Passive Reader/Writers
*******************************************************************************
ABx Fast Command 6 (06H): Block Write
DESCRIPTION
Write a block of data to an RFID tag.
DISCUSSION
The Block Write command is used to write segments of data to
contiguous areas of tag memory. It is capable of addressing 1 kByte
of the read/write address space of a tag in a single command. The
BlockWrite command requires as parameters the start address, the
Timeout,2 seconds 07D0H Data fromaddress
0003H
E7H
Checksum 17H Data from address
0004H
0AH
Terminator 03H Checksum 55H
Terminator 03H
Command from host Response from controller
Field Content Field Content
RFID Interface
LRP2000 Long Range Passice Reader/Writer 103
number of bytes to be written, and the data to be written to the RFID
tag. If the write range exceeds the last tag address, the controller will
return an invalid format error message (error code 21H).
Field Content
Header 0202H
Packet Size Packet length in Bytes excluding the header,
command size, checksum and terminator Bytes.
0007H plus the number of data Bytes
Command 06H
Start Address 2-Byte value for the starting tag address
Number of Bytes 2-Byte value for the number of Bytes that will be
written
Timeout 2-Byte value for timeout in 1 ms units. (1EH -
FFFEH)
Data Data Bytes to be written
Checksum Optional Checksum
Terminator 03H
Example
Writes 4 Bytes of data to the tag starting at address 0000H. A timeout
of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the
completion of the BlockWrite.
Command from host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 000BH Response Size 0001H
Command Code 06H Command
Echo
06H
RFID Interface
104 LRP820S-Series Long-Range Passive Reader/Writers
*******************************************************************************
ABxFast Command 07H: Read Tag Serial Number
DESCRIPTION
This command retrieves the 8-Byte tag serial number.
DISCUSSION
Start address 0000H Checksum F8H
Number of Bytes 0004H Terminators 03H
Timeout,2 seconds 07D0H
Data to write to
address 0000H
52H
Data to write to
address 0001H
46H
Data to write to
address 0002H
49H
Data to write to
address 0003H
44H
Checksum EEH
Terminators 03H
Command from host Response from controller
Field Content Field Content
RFID Interface
LRP2000 Long Range Passice Reader/Writer 105
Each ISO-15693 compliant tag has a unique (over 280 trillion
possibilities) serial number. This number can not be changed and is
not part of the available read/write address space of a tag. The
presence of multiple tags in the field will not cause errors, the
controller will simply return the serial number that it reads. This
presents a potentially dangerous uncertainty in that there is no
general way to predict which tag the controller will read first.
Field Content
Header 0202H
Command Size Packet length in Bytes excluding the header,
command size, checksum and terminator Bytes.
0003H for this command
Command 07H
Timeout 2-Byte timeout value in 1 ms increments (1EH -
FFFEH)
Checksum Optional Checksum
Terminator 03H
Example
This example will wait until a tag is in range and then reads the 8-Byte
serial number. In this example the serial number is
F2720300000104E0.
Command from host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 0003H Response Size 0009H
RFID Interface
106 LRP820S-Series Long-Range Passive Reader/Writers
*******************************************************************************
ABxFast Command 8 (08H): Tag Search
DESCRIPTION
Checks for an RFID tag in the controller field.
Command Code 07H Command Echo 07H
Timeout 07D0H First ID Byte F2H
Checksum 1EH Second ID Byte 72H
Terminators 03H Third ID Byte 03H
Fourth ID Byte 00H
Fifth ID Byte 00H
Sixth ID Byte 01H
Seventh ID Byte 004H
Eighth ID Byte E0H
Checksum A3H
Terminators 03H
Command from host Response from controller
Field Content Field Content
RFID Interface
LRP2000 Long Range Passice Reader/Writer 107
DISCUSSION
This command will activate the controller to "look" for a tag in the RF
field. If the controller finds a tag it will return a command echo to the
host. If no tag is present it will return an error message. Even though
this command is grouped with single-tag commands, the presence of
multiple tags within range of the antenna will not cause errors. See
Section 6.6 for information on the error messages.
Field Content
Header 0202H
Command Size Packet length in Bytes excluding the header,
command size, checksum and terminator
Bytes. 0003H for this command
Command 08H
Timeout 2-Byte value for the time in 1 ms units (1EH -
FFFEH)
Checksum Optional Checksum
Terminator 03H
Example
Checks for an RFID tag within range of the antenna. A timeout of 2
seconds (07D0H = 2000 x 1 msec increments) is set for the
completion of the Tag Search.
Command from host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 0003H Response Size 0001H
Command Code 08H Command Echo 08H
Timeout 07D0H Checksum F6H
Checksum 1DH Te r m i n a t o rs 03H
Terminators 03H Field Content
RFID Interface
108 LRP820S-Series Long-Range Passive Reader/Writers
*******************************************************************************
ABx Fast Command 0DH: Start/Stop Continuous
Block Read
RFID Interface
LRP2000 Long Range Passice Reader/Writer 109
DESCRIPTION
Sends block reads continuously to any tag in range of the antenna.
When a tag enters the RF field, it is read and the data passed to the
host computer. The controller continues to read the tag but will not
send the same data to the host until the tag has been outside the RF
field for a specified time period. This Delay Between Identical
Decodes parameter prevents redundant data transmissions when the
controller is in Continuous Block Read mode.
DISCUSSION
The Start/Stop Continuous Block Read command contains three
parameters: Start Address, Number of Bytes and Delay Between
Duplicate Decodes. The read length parameter switches the mode.
Any valid, non-zero length will set the controller into Continuous Block
Read mode. A read length value of 00H will stop the Continuous read.
The Delay Between Identical Decodes parameter can have a value of
0 to 60 seconds. When the Delay Between Identical Decodes is set to
0, the controller will continuously read and transmit tag data to the
host. This can flood the buffers and cause communication errors and
data loss. If the controller receives other commands from the host, it
will execute them and then resume Continuous Block Read mode.
Issuing the command with the Number of Bytes set to 00H will stop
the Continuous Block Read.
The command is formatted as follows.
Field Content
Header 0202H
Command Size Command length in Bytes excluding the header,
command size, checksum and terminator Bytes.
Command 0DH
Start Address 2-Byte value for the start address in the tag
Number of Bytes 2-Byte value of the number of bytes to be
addressed.
Delay Between Duplicate
Decodes
Delay value given in 1 second units
Checksum Optional Checksum
Terminator 03H
This example places the controller in Continuous Block Read mode
and reads 8 Bytes of data from the tag starting at address 0001H. A
delay between identical reads of 2 seconds (0002H = 2 x 1 second
increments) is set.
Command from Host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 0006H Response Size 0001H
Command Code 0DH Command Echo 0DH
Start Address 0001H Checksum F1H
Number of
Bytes
0008H Te r m i n a t o r 03H
Delay Between
Duplicate
Decodes
02H
Checksum E1H
RFID Interface
110 LRP820S-Series Long-Range Passive Reader/Writers
*******************************************************************************
ABx Fast Command 14H: Get Block Status
DESCRIPTION
RFID Interface
LRP2000 Long Range Passice Reader/Writer 111
Returns the lock status of the specified blocks of data.
DISCUSSION
This command can be used to determine whether blocks of tag
memory are locked; marked "read-only." The number of specified
contiguous blocks are addressed from the specified first block. The
response from the controller gives the status of each block through a
one-Byte value. The value is 00H if the block is unlocked, 01H if
locked. The size and organization of the blocks in a particular tag can
be found through the use of command 15H, Get Label Information.
Field Content
Header 0202H
Command Size Packet length in Bytes excluding the header,
command this command size, checksum and
terminator Bytes. 0005H for this command
Command 14H
First Block One-Byte address of the first block to be
Interrogated.
Number of blocks One-Byte
Timeout 2-Byte value for timeout in 1 ms units. (1EH -
FFFEH)
Checksum Optional Checksum
Terminator 03H
Example
Command from host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 0005H Response Size 0005H
Command Code 14H Command Echo 14H
First Block 00H status of block
zero
00H
Number of Blocks 04H status of block one 00H
Timeout,2 seconds 07D0H status of block
two
01H
Checksum 0BH status of block
three
00H
Terminator 03H Checksum E5H
Terminator 03H
RFID Interface
112 LRP820S-Series Long-Range Passive Reader/Writers
Interrogates the lock status of the first four blocks of the tag's memory
for a timeout period of 2 seconds.
*******************************************************************************
RFID Interface
LRP2000 Long Range Passice Reader/Writer 113
ABx Fast Command 15H: Get Label Information
DESCRIPTION:
This command retrieves manufacturer's data and the Family Code
from the tag.
Field Content
Header 0202H
Command Size Packet length in Bytes excluding the header,
command size, Checksum and terminator Bytes.
0003H for this command
Command 15H
Timeout 2-Byte value for timeout in 1 ms units. (1EH -
FFFEH)
Checksum Optional Checksum
Terminator 03H
Example
This command is issued to retrieve the family code from a tag.
Command from host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 0003H Response Size 0007H
Command Code 15H Command Echo 15H
Timeout,2
seconds
07D0H Information Flags
Byte
07H
Checksum 10H Format Information 00H
Terminator 03H Family Code 00H
Block Size 04H
Number of Blocks 1CH
Checksum BCH
Terminator 03H
*******************************************************************************
RFID Interface
114 LRP820S-Series Long-Range Passive Reader/Writers
ABxFast Command 16H: Write Family Code
DESCRIPTION
Change the family code of an RFID tag.
Field Content
Header 0202H
Packet Size Packet length in Bytes excluding the header, command
size, checksum and terminator Bytes. Always 0004H for
this command.
Command 16H
Timeout 2-Byte value for timeout in 1 ms units. (1EH - FFFEH)
Family Code The value to which the family code will be changed.
Checksum Optional Checksum
Terminator 03H
Example
Change the family code of the tag to 00H.
Command from host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 0004H Response Size 0001H
Command Code 16H Command Echo 16H
Timeout 07D0H Checksum E8H
Family Code 00H Te r m i n a t o r 03H
Checksum FCH
Terminator 03H
*******************************************************************************
RFID Interface
LRP2000 Long Range Passice Reader/Writer 115
ABxFast Command 17H: Lock Family Code
DESCRIPTION:
Locks the Family Code Byte to its current value so that it cannot be
written. Once locked, the Family Code cannot be unlocked.
Command from host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 0003H Response Size 0001H
Command Code 17H Command Echo 17H
Timeout, 2
seconds
07D0H Checksum E7H
Checksum 0EH Te r m i n a t or 03H
Terminator 03H
*******************************************************************************
RFID Interface
116 LRP820S-Series Long-Range Passive Reader/Writers
ABxF Command 82H: Read Data and SN All
DESCRIPTION
Read a block of data from all RFID tags-in-field or all those with the
specified Family Code. Data will be returned with the serial number of
the corresponding tag.
DISCUSSION
This command is used to read segments of data from contiguous
areas of tag memory. It is capable of handling up to 1KByte of data
transferred to the host with one command. The timeout value is given
in 1 msec increments and can have a value of 1EH to FFFEH (65,534
ms). When the timeout is set to 0, the controller will return a syntax
error. The response to this command will contain the serial number of
the responding tags preceding the data from those tags. The
termination packet is transmitted when the timeout expires. Each
packet will be sent to the host as soon as it is available. The returned
serial numbers can be used to read from or to write to tags-in-field via
the SN Block Read or Write commands. The SN Block Read All
consists of a header, a family Code, a start address and length,
followed by a timeout value and the message terminator, 03H, as
shown below. A special termination packet is sent when the timeout
expires. If the read range exceeds the last tag address, the controller
will return an error message in the status Byte. The command is
formatted as follows.
Field Content
Header 0202H
Command Size Packet length in Bytes excluding the header,
command size, checksum and terminator
Bytes.
Command 82H
Family Code Tag Family Code - 00H = all tags
Reserved Ignored Byte, set to 00H
Start Address 2-Byte value for the starting tag address
Number of Bytes 2-Byte value for the number of Bytes to be
read
Timeout 2-Byte value for timeout in 1 ms units. (1EH -
FFFEH)
Checksum Optional Checksum
Terminator 03H
Example
RFID Interface
LRP2000 Long Range Passice Reader/Writer 117
Reads 4 Bytes of data from the tag starting at address 0001H. A
timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for
the completion of the SN Block Read All. The Tag Family Byte is set to
zero so all tags will be read. Three tags respond with data.
Command from host Response from controller
Field Content Field Content
Header 0202H Header/tag 1 0202H
Command Size 0009H Response Size 000DH
Command Echo 82H Command Code 82H
Family Code 03H SN Byte 1/tag 1 A6H
Reserved 00H SN Byte 2/ tag 1 72H
Start address 0000H SN Byte 3/tag 1 03H
Block Size 0004H SN Byte 4/tag 1 00H
Timeout,2
seconds
07D0H SN Byte 5/tag 1 00H
Checksum 96H SN Byte 6/tag 1 01H
Terminators
<ETX>
03H SN Byte 7/tag 1 04H
SN Byte 8/tag 1 E0H
Data Byte 1/ tag
1
52H
Data Byte 2/tag
1
46H
Data Byte 3/tag
1
49H
Data Byte 4/tag
1
44H
Checksum 4BH
Te r m i n a t o r 03H
Header/tag 2 0202H
Response Size 000DH
Command Code 82H
SN Byte 1/tag 2 F1H
SN Byte 2/ tag 2 72H
SN Byte 3/tag 2 03H
SN Byte 4/tag 2 00H
SN Byte 5/tag 2 00H
SN Byte 6/tag 2 01H
RFID Interface
118 LRP820S-Series Long-Range Passive Reader/Writers
SN Byte 7/tag 2 04H
SN Byte 8/tag 2 E0H
Data Byte 1/ tag
2
52H
Data Byte 2/tag
2
46H
Data Byte 3/tag
2
49H
Data Byte 4/tag
2
44H
Checksum 00H
Te r m i n a t o r 03H
Header/tag 3 0202H
Response Size 000BH
Command Echo 82H
SN Byte 1/tag 3 71H
SN Byte 2/ tag 3 72H
SN Byte 3/tag 3 03H
SN Byte 4/tag 3 00H
SN Byte 5/tag 3 00H
SN Byte 6/tag 3 01H
SN Byte 7/tag 3 04H
SN Byte 8/tag 3 E0H
Data Byte 1/ tag
3
53H
Data Byte 2/tag
3
48H
Data Byte 3/tag
3
49H
Data Byte 4/tag
3
54H
Checksum 6FH
Te r m i n a t o r 03H
Header 0202H
Response Size 0003H
Command Echo FFH
Number of tags 03H
Command from host Response from controller
Field Content Field Content
Header 0202H Header/tag 1 0202H
RFID Interface
LRP2000 Long Range Passice Reader/Writer 119
*******************************************************************************
Status Byte 08H
Checksum F2H
Termi na to r s
<ETX>
03H
Command from host Response from controller
Field Content Field Content
Header 0202H Header/tag 1 0202H
RFID Interface
120 LRP820S-Series Long-Range Passive Reader/Writers
ABxF Command 83H: Start/Stop Continuous SN
Read All
DESCRIPTION
Start and Stops continuous read all mode for multiple tags. It reads
the Serial Number and tag data. While in this mode, any other
command can be issued and it will be handled properly. After
processing the interrupting command, the controller will resume the
continuous read. Continuous SN Read All is started or stopped
through a unique parameter, Start Continuous Read. This parameter
is set to 01H to initiate the Continuous Read, and set to zero to stop it.
The command uses the parameter Tag Repeat Count to limit multiple
reads of the same tag. A tag is not read a second time until this
specified number of tags have been read since it was last read.
Allowed values are from 0 to 255 (FFH), where 0 means the tag can
be reread anytime. When Start/Stop Continuous SN Read All is
interrupted with another command, the repeat count is saved during
execution of the other commands, allowing any tag to be addressed
by the interrupting command. Upon completion of the interrupting
command, the value of the Tag Repeat Count is restored. The
Reader/Writer will respond after receipt of the command with an
acknowledge packet. This will be followed by data packets for each
tag read
Field Content
Header 0202H
Command Size Command length in Bytes excluding the
header, command size, checksum and
terminator Bytes.
Command 83H
Family Code Tag Family Code - 00H = all tags
Reserved Ignored Byte, set to 00H
Start Address Two-Byte address for the first Byte to be
read.
Number of Bytes Number of bytes to be read from the tag.
Tag Repeat Count Number of tags to be read before data will
bereturned twice from any individual tag
Start Continuous 01H to start Continuous Read
Read 00H to stop
Checksum Optional Checksum
Message Terminator 03H
RFID Interface
LRP2000 Long Range Passice Reader/Writer 121
Example
Starts continuous read of three Bytes starting at address two, Repeat
count of four, with the family code set to 00H, so that all tags in the
field will respond.
Command from host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 0008H Response Size 0001H
Command Code 83H Command Echo 83H
Family Code 00H Checksum 7BH
Reserved 00H Te r m i n a t or 03H
Start Address 0002H
Number of
Bytes
0003H
Repeat Count 04H
Start 01H
Checksum 6AH
Terminator 03H
After the controller sends the acknowledgement, it will send the data
read from the tags in the field
Response from controller
Field Content
Header 0202H
Response Size 000BH
Command Echo/Tag 1 83H
Data from address 0002H AAH
Data from address 0003H 21H
Data from address 0004H 44H
Checksum 62H
Terminator 03H
Header 0202H
Response Size 000BH
Command Echo/Tag 2 83H
Data from address 0002H AAH
Data from address 0003H 21H
Data from address 0004H 44H
Checksum 62H
Terminator 03H
Header 0202H
Response Size 000BH
Command Echo/Tag 3 83H
Data fromaddress 0002H AAH
Data from address 0003H 21H
Data from address 0004H 44H
Checksum 62H
Terminator 03H
RFID Interface
122 LRP820S-Series Long-Range Passive Reader/Writers
RFID Interface
LRP2000 Long Range Passice Reader/Writer 123
*******************************************************************************
ABxF Command 84H: Fill All
DESCRIPTION
Fill all RFID tags-in-field or all tags in the same family, with a one-Byte
value over multiple contiguous addresses.
DISCUSSION
This command is commonly used to clear an RFID tag's memory. It
writes a one Byte value repetitively across a specified range of tag
addresses. All tags present in the antenna field with the specified
Family Code will be affected by this command. The Fill All function
requires one Data Value Byte, a Start Address, and a Number of
Bytes to fill. It will fill the tag with the data value Byte, starting at the
specified start address for the specified number of consecutive Bytes.
The Fill Length must be set to a non-zero value. The timeout value is
given in 1 msec increments and can have a value of 1EH to FFFEH
(65,534 ms). When the timeout is set to 0, the controller will return a
syntax error.
Field Content
Header 0202H
Packet Size Packet length in Bytes excluding the
header, packet size, checksum and
terminator Bytes. 0008H for this
command
Command 84H
Family Code Tag Family Code - 00H = all tags
Reserved Ignored, set to 00H
Start Address 2-Byte value for the starting tag
address
Fill Length 2-Byte value for the length of the fill in
number of Bytes (1-48)
Timeout 2-Byte value for timeout in 1 ms units.
(1EH - FFFEH)
Data value Byte 1 Byte of fill
Checksum Optional Checksum
Terminator 03H
RFID Interface
124 LRP820S-Series Long-Range Passive Reader/Writers
Example
Writes 41H -- the ASCII character "A" -- to all tags with Family Code
03H, starting at address 0005H for the following next consecutive 40
Bytes. A timeout of 2 seconds (07D0H = 2000 x 1 msec increments) is
set for the completion of the configuration. Four tags are found and
filled successfully.
Command from host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 000AH Response Size 0003H
Command Code 84H Command Echo 84H
Family Code 03H Numbers of tags 04H
Reserved 00H Status Byte 08H
Start address 0005H Checksum 6CH
Number of Bytes 0028H Te r m i na t o r 03H
Timeout,2 seconds 07D0H
Data Value Byte 41H
Checksum 27H
Terminator 03H
RFID Interface
LRP2000 Long Range Passice Reader/Writer 125
*******************************************************************************
ABxF Command 85H: Block Read All
DESCRIPTION
Read a block of data from all RFID tags-in-field or all those with the
specified Family Code.
DISCUSSION
This command is used to read segments of data from contiguous
areas of tag memory. The timeout value is given in 1 msec increments
and can have a value of 1EH to FFFEH (65,534 ms). When the
timeout is set to 0, the controller will return a syntax error. The Block
Read All consists of a Family Code, the reserved byte, a start address
and length, followed by a timeout value and a message terminator as
shown below. If the read length exceeds the last tag address, the
controller will return an syntax error message (error code 21H). A
special termination packet is sent when the timeout expires. A
response is returned after successful completion of the operation or
when the timeout expires.
Field Content
Header 0202H
Command Size Packet length in Bytes excluding the
header, command size, checksum and
terminator Bytes.
Command 85H
Family Code Tag Family Code - 00H = all tags
Reserved Ignored, set to 00H
Start Address 2-Byte value for the starting tag address
Number of Bytes 2-Byte value for the number of bytes to be
read
Timeout 2-Byte value for timeout in 1 ms units. (1EH
- FFFEH)
Checksum Optional Checksum
Terminator 03H
RFID Interface
126 LRP820S-Series Long-Range Passive Reader/Writers
Example
Reads 4 Bytes of data from tags with Family ID AAH, starting at
address 0001H. A timeout of 2 seconds (07D0H = 2000 x 1 msec
increments) is set for the completion of the Block Read All. The Family
Code is set to zero so all tags will be read.
Command from host Response from controller
Field Content ield Content
Header 0202H Header 0202H
Command Size 0009H Response Size 0003H
Command Code 85H Command
Echo/Tag 1
85H
Family Code 00H Data from
address 0001H
05H
Reserved 00H Data from
address 0002H
AAH
Start address 0001H Checksum C8H
Length of read 0002H Te r m i n a t o r 03H
Timeout, 2
seconds
07D0H Header 0202H
Checksum EBH Response Size 0003H
Terminator 03H Command
Echo/Tag 2
85H
Data from
address 0001H
05H
Data from
address 0002H
AAH
Checksum C8H
Te r m i n a t or 03H
Header 0202H
Response Size 0003H
Command
Status
FFH
Number of tags 02H
Status Byte 08H
Checksum F3H
Te r m i n a t or 03H
RFID Interface
LRP2000 Long Range Passice Reader/Writer 127
*******************************************************************************
ABxF Command 86H: Block Write All
DESCRIPTION
Write a block of data to an RFID tag.
DISCUSSION
The Block Write All command is used to write segments of data to
contiguous areas of tag memory. The timeout value is given in 1 msec
increments and can have a value of 1EH to FFFEH (65,534 ms).
When the timeout is set to 0, the controller will return a syntax error.
The Block Write All consists of a Family ID, the Reserved Byte, a Start
address, and the Number of Bytes followed by the Bytes to be written
to the RFID tag. If the write range exceeds the last tag address, the
controller will return a syntax error message (error code 21H). The
controller will return a response when the timeout expires.
Field Content
Header 0202H
Command Size Packet length in Bytes excluding the header,
command size, checksum and terminator Bytes.
0009H plus the number of data Bytes
Command 86H
Family ID Tag Family ID - 00H = all tags
Reserved Ignored, set to 00H
Start Address 2-Byte value for the starting tag address
Number of Bytes 2-Byte value for the number of bytes to be writen
Timeout 2-Byte value for timeout in 1 ms units. (1EH - FFFEH)
Data Bytes of data to be written.
Checksum Optional Checksum
Terminator 03H
Example
Writes 4 Bytes of data to the tag starting at address 0000H. A timeout
of 2 seconds (07D0H = 2000 x 1 msec increments) is set for the
completion of the Block Write All. Family ID is set to 00H so all tags-in-
field will be written to. Five tags are written to.
Command from host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 000DH Response Size 0003H
Command Code 86H Command Echo 86H
Family ID 00H Number of Tags 05H
Reserved 00H Status Byte 08H
Start address 0000H Checksum 69H
Number of
Bytes
0004H Te r m i n a t o r 03H
Timeout,2
seconds
07D0H
Data to write to
address 0000H
52H
Data to write
toaddress
0001H
46H
Data to write
toaddress
0002H
49H
Data to write
toaddress
0003H
44H
Checksum 68H
Terminator 03H
RFID Interface
128 LRP820S-Series Long-Range Passive Reader/Writers
RFID Interface
LRP2000 Long Range Passice Reader/Writer 129
*******************************************************************************
ABxF Command 87H: Read Tag SN All
DESCRIPTION
This command retrieves the 8-Byte tag serial number from all tags-in-
field or those with the specified Family ID.
DISCUSSION
Each ISO-15693 compliant tag has an unique (over 280 trillion
possibilities) serial number. This number can not be changed and is
not part of the available read/write address space. A special
termination packet is sent when the timeout expires. A response is
returned when the timeout expires.
Field Content
Header 0202H
Command Size Packet length in Bytes excluding the header, command
size, checksum and terminator Bytes. 0005H for this
command
Command 87H
Family ID Tag Family ID - 00H = all tags
Reserved Ignored, set to 00H
Timeout 2-Byte timeout value in 1 ms increments (1EH - FFFEH)
Checksum Optional Checksum
Terminator 03H
RFID Interface
130 LRP820S-Series Long-Range Passive Reader/Writers
Example
This example will read the 8-Byte serial number from all tags
permitted by the Family ID and Reserved . In this example, one tag
responds and the serial number is 1E6E3DC200000000H
Command from host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 0005H Response Size 0009H
Command Code 87H Command Echo 87H
Family ID 00H SN Byte 1 F2H
Reserved 01H SN Byte 2 75H
Timeout 07D0H SN Byte 3 03H
Checksum 9BH SN Byte 4 00H
Terminator 03H SN Byte 5 00H
SN Byte 6 00H
SN Byte 7 04H
SN Byte 8 E0H
Checksum E4H
Te r m i n a t or 03H
Header 0202H
Response Size 0003H
Command
Status
FFH
Number of Tags 01H
Status Byte 08H
Checksum F4H
Te r m i n a t or 03H
RFID Interface
LRP2000 Long Range Passice Reader/Writer 131
*******************************************************************************
ABxF Command 88H: Tag Search All
DESCRIPTION
Searches for tags within range of the antenna.
DISCUSSION
This command will activate the controller to "look" for tags within
range of the antenna. As soon as the controller finds a tag it will return
a command echo to the host. The timeout value is given in 1 msec
increments and can have a value of 1EH to FFFEH (65,534 ms). If no
tag is present it will return an error message. See Section 6.6 for
information on the error messages.
Field Content
Header 0202H
Command Size Packet length in Bytes excluding the header, command
size, checksum and terminator Bytes. 0005H for this
command
Command 88H
Family ID Tag Family ID - 00H = all tags
Reserved Ignored, set to 00H
Timeout 2-Byte value for the time in 1 ms units (1EH - FFFEH)
Checksum Optional Checksum
Terminator <ETX>
RFID Interface
132 LRP820S-Series Long-Range Passive Reader/Writers
Example
Checks for the presence of an RFID tag within range of the antenna.
Atimeout of 2 seconds (07D0H = 2000 x 1 msec increments) is set for
thecompletion of the Tag Search All. A tag is found.
Command from host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 0005H Response Size 0003H
Command Code 88H Command Echo 88H
Family ID 00H Number of Tags 01H
Reserved 00H Status Byte 00H
Timeout 07D0H Checksum 73H
Checksum 99H Te r m i n a t or s 03H
Terminator 03H
RFID Interface
LRP2000 Long Range Passice Reader/Writer 133
*******************************************************************************
ABxF Command 8DH: Stop/Start Continuous Read
All
DESCRIPTION
Starts and stops Continuous Read mode for multiple tags.
DISCUSSION
The Start/Stop Continuous Read All mode is initiated by issuing the
command with the Number of Bytes set to any valid nonzero value.
Stop the mode by sending the command with a read length of 0. While
in thismode, any other command can be issued and it will be handled
properly. After processing the new command, the controller will
resume the Continuous Read All mode. The command has a
parameter, Tag Repeat Count, that can prevent multiple reads of the
same tag. A tag is not read a second time until a specified number of
tags have been read since it was last read. Allowed values are from 0
up to 255 (FFH), where 0 means the tag can be re-read anytime.
When Continuous Read All mode is interrupted with other commands,
the tag delay count is stopped during execution of the other
commands and then resumed. The controller will respond with an
acknowledge packet followed by data packets for each tag read.
CONFIG LED blinks after each packet transmission.
Field Content
Header 0202H
Command Size Command length in Bytes excluding
the header command size, checksum
and terminator Bytes.
Command 8DH
Family ID Tag Family ID - 00H = all tags
Reserved Ignored, set to 00H
Start Address Tag address for the start of the read
Number of Bytes 0 = stop. Any valid nonzero value
indicates the number of Bytes to be
read
Tag Delay Number of tags that must be read
before the same tag will be read
again (0-225)
Checksum Optional Checksum
Message Terminator 03H
RFID Interface
134 LRP820S-Series Long-Range Passive Reader/Writers
Example
Reads 4 Bytes of data from the tag starting at address 0001H. The
Family ID Byte is set to zero so all tags will be read. The Tag Delay is
set to 20 (14H). Two tags respond with read data.
Command from host Response from controller
Field Content Field Content
Header 0202H Heade 0202H
Command Size 0008H Response Size 0001H
Command Code 8DH Command Echo 8DH
Family ID 00H Checksum 71H
Reserved 00H Te r m i n a t or 03H
Start Address 0001H
Read Length 0004H
Tag Delay 14H
Checksum 50H
Terminator 03H
After the controller sends the acknowledgment, it will send the read
data from the 2 tags.
Field Content
Header 0202H
Response Size 0005H
Command Echo/
Ta g 1
8DH
Data from address
0001H
05H
Data from address
0002H
AAH
Data from address
0003H
21H
Data from address
0004H
44H
RFID Interface
LRP2000 Long Range Passice Reader/Writer 135
Checksum 59H
Terminator 03H
Header 0202H
Response Size 0003H
Command Echo/
Ta g 2
85H
Data from address 0001H
05H Data from
address 0002H AAH
Data from address 0003H
21H Data from
address 0004H 44H
Checksum 59H
Terminator 03H
Field Content
RFID Interface
136 LRP820S-Series Long-Range Passive Reader/Writers
*******************************************************************************
ABxF Command 8EH: Memory Lock All
DESCRIPTION
This command locks contiguous blocks of read-write memory. Once
Bytes are locked, they cannot be written to, nor can they be unlocked.
DISCUSSION
The memory can be locked only in contiguous blocks. The command
passes one parameter for the first block and another parameter for the
number of blocks to be locked. This is one of only two ABx
commands which address the memory of the tag using these
parameters. The block structure of the tags is governed by the ISO-
15693 specification. ABx command 15H can be used to obtain the
memory organization for a particular tag. Attempting to write to locked
Bytes will return a Write Security Error.
The command is formatted as shown below.
Field Content
Header 0202H
Command Size Command length in Bytes excluding the
header,command size, checksum and terminator
Bytes. 07H for this command.
Command 8EH
Family Code Tag Family ID - 00H = all tags
Reserved Ignored, set to 00H
Timeout Timeout value given in 1 ms units
Starting Block First block of memory to be locked
Number of Blocks The number of blocks whose memory will be locked
Checksum Optional Checksum
Message Terminator 03H
RFID Interface
LRP2000 Long Range Passice Reader/Writer 137
Example
This example will lock blocks 0-3 on all tags-in-field with the
FamilyCode of 02H. Two tags are found and locked.
Command from host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 0007H Response
Size
0003H
Command Code 8EH Command
Echo
8EH
Family ID 02H Number of
Tags
02H
Reserved 00H Status Byte 08H
Timeout 07D0H Checksum 64H
First block 00H Terminator 03H
Number of
blocks
03H
Checksum 8EH
Terminator 03H
RFID Interface
138 LRP820S-Series Long-Range Passive Reader/Writers
*******************************************************************************
ABxF Command 8BH: Write Family Code All
DESCRIPTION
This command can be used to write the Family Code of all tags in the
field. It can also be used to selectively rewrite the family codes of tags
with Family Codes already set to a particular value.
The command is formatted as shown below.
Field Content
Header 0202H
Command Size Command length in Bytes excluding the
header, command size, checksum and
terminator Bytes. 06H for this command.
Command 8BH
Current Family Code Tag Family ID - 00H = all tags used to
select which tags are addressed
Reserved Ignored, set to 00H
Timeout Timeout value given in 1 ms units
New Family Code The value which will be written to the
Family Codes of all the addressed tags
Checksum Optional Checksum
Message Terminator 03H
RFID Interface
LRP2000 Long Range Passice Reader/Writer 139
Example
This example will change the Family code depending on the current
value of the family code. Two tags are found with Family Code 02H
and they are changed to 03H.
Command from host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 0006H Command Size 0006H
Command Code 8BH Command Code 8BH
Family ID 02H Family ID 02H
Reserved 00H Reserved 00H
Timeout 07D0H Timeout 07D0H
New Family Code 03H New Family Code 03H
Checksum 92H Checksum 92H
Terminator 03H Terminator 03H
RFID Interface
140 LRP820S-Series Long-Range Passive Reader/Writers
*******************************************************************************
ABxF Command 8CH: Lock Family Code All
DESCRIPTION
This command locks the family codes of tags in the field. Once locked,
the Family Codes cannot be changed or unlocked.
DISCUSSION
The command must pass a family code to select the tags whose
family code will be locked. The controller will return a response when
the timeout period expires. The parameter of the response in the
number of tags written.
The command is formatted as shown below.
Field Content
Header 0202H
Command Size Command length in Bytes excluding the header,
command size, checksum and terminator Bytes. 07H
for this command.
Command 8CH
Family Code Tag Family ID - 00H = all tags
Reserved Ignored, set to 00H
Timeout Timeout value given in 1 ms units
Checksum Optional Checksum
Message
Terminator
03H
RFID Interface
LRP2000 Long Range Passice Reader/Writer 141
Example
This example will lock the Family Code on all tags with the Family
Code of 02H. Two tags are found and locked.
Command from host Response form controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 0005H Response Size 0003H
Command Code 8CH Command Echo 8CH
Family ID 02H Number of Tags 02H
Reserved 00H Status Byte 08H
Timeout 07D0H Checksum 67H
Checksum 95H Te r m i n a t or 03H
Terminator 03H
RFID Interface
142 LRP820S-Series Long-Range Passive Reader/Writers
*******************************************************************************
ABxF Command 94H: SN Fill
DESCRIPTION
Fills only the RFID tag specified by serial number with a one byte
value over multiple contiguous addresses.
DISCUSSION
This command is commonly used to clear an RFID tag's memory. It
writes a one byte value repetitively across a specified range of tag
addresses. Only the tag with the specified serial number will be
affected by this command. The controller will return a response after
the successful fill operation or when the timeout expires. The fill
function requires a Serial Number, one data value byte, a starting
address, and a fill length. It fills the specified tag with the data value
byte, starting at the specified start address for the specified number of
consecutive bytes. When Fill Length is set to 0, the controller will write
fill data from the start address to the end of the tag's memory. The
timeout value is given in 1 msec increments and can have a value of
1EH to FFFEH (65,534 ms). When the timeout is set to 0, the
controller will return a syntax error. It returns a response when done or
when the timeout expires.
Field Content
Header 0202H
Command Size Command length in Bytes excluding the
header, command size, checksum and
terminator Bytes.
Command 94H
Family Code Ignored, set to 00H
Reserved Ignored, set to 00H
Start Address 2-Byte value for the starting tag address
Number of Bytes 2-Byte value for the length of the fill in
number of Bytes
Timeout Timeout value given in 1 ms units
Serial Number Serial Number of the tag to be addressed
Data Value Value to be written to all addressed bytes
Checksum Optional Checksum
Message Terminator 03H
RFID Interface
LRP2000 Long Range Passice Reader/Writer 143
A response to a successful command will follow this form.
Field Content
Header 0202H
Response size 01H
Command Echo 94H
Checksum Optional
Checksum
Message Terminator FFFFH
RFID Interface
144 LRP820S-Series Long-Range Passive Reader/Writers
*******************************************************************************
ABxF Command 95H: SN Block Read
DESCRIPTION
Read a block of data from a specified RFID tag.
DISCUSSION
This command is used to read segments of data from contiguous
areas of tag memory. It is capable of handling up to 1 kByte of data
transferred to the host with one command. The timeout value is given
in 1 msec increments and can have a value of 1EH to FFFEH (65,534
ms). When the timeout is set to 0, the controller will return a syntax
error. The SN Block Read consists of Family ID and Serial Number a
start address and length, followed by a timeout value. The 8-byte
serial number of the target tag is specified. If the read length exceeds
the last tag address, the controller will return an error message in the
status byte. It returns a response when done or when the timeout
expires.
Field Content
Header 0202H
Command Size Command length in Bytes excluding the
header, command size, checksum and
terminator Bytes.
Command 95H
Family Code Ignored, set to 00H
Reserved Ignored, set to 00H
Start Address 2-Byte value for the starting tag address
Number of Bytes 2-Byte value for the length of the fill in
number of Bytes
Timeout Timeout value given in 1 ms units
Serial Number Serial Number of the tag to be addressed
Checksum Optional Checksum
Message Terminator 03H
RFID Interface
LRP2000 Long Range Passice Reader/Writer 145
A response to a successful command will follow this form.
Field Content
Header 0202H
Response Size 0001H
Command Echo 95H
Checksum Optional
Checksum
Message
Terminator
FFFFH
RFID Interface
146 LRP820S-Series Long-Range Passive Reader/Writers
*******************************************************************************
ABxF Command 96H: SN Block Write
DESCRIPTION
Write data to a single RFID tag specified by its serial number.
DISCUSSION
This command is used to write data to contiguous areas of tag
memory. It is capable of transferring up to 1 kByte of data from the
host to the controller in a single command. The timeout value is given
in 1 msec increments and can have a value of 1EH to FFFEH (65,534
ms). When the timeout is set to 0, the controller will return a syntax
error. The SN BlockWrite consists of a Family ID, Serial Number and
start address followed by the data stream to be written to the RFID
tag. If the write range exceeds the last tag address, the controller will
return a syntax error, 21H. It returns a response when done or when
the timeout expires.
Field Content
Header 0202H
Command Size Command length in Bytes excluding the
header, command size, checksum and
terminator Bytes.
Command 96H
Family Code Ignored, set to 00H
Reserved Ignored, set to 00H
Start Address 2-Byte value for the starting tag address
Number of Bytes 2-Byte value for the length of the fill in
number of Bytes
Timeout Timeout value given in 1 ms units
Serial Number Serial Number of the tag to be addressed
Data Data to be written to the tag
Checksum Optional Checksum
Message Terminator 03H
RFID Interface
LRP2000 Long Range Passice Reader/Writer 147
A response to a successful command will follow this form.
Field Content
Header 0202H
Response size 01H
Command Echo 96H
Checksum Optional Checksum
Message Terminator FFFFH
RFID Interface
148 LRP820S-Series Long-Range Passive Reader/Writers
*******************************************************************************
ABxF Command 10H: Set Output
DESCRIPTION
Set the states of the output lines and output LEDs "A" through "D."
DISCUSSION
This command will set the state of the digital output lines using a one-
Byte parameter, Output Status. The least significant nibble of the
Output Status Byte will determine the status of the outputs. The least
significant bit of this nibble corresponds to Output A. The most
significant bit of this nibble corresponds to Output D. The most
significate nibble of the Output Status Byte is reserved and should
beset to 0H. An output bit set to one(1) will turn the corresponding
LED on and close the electronic switch of the output, allowing current
to flow through the output circuit. An output bit reset to zero will turn
the corresponding LED off and open the electronic switch in the output
circuit. The following chart shows the hex values for all combinations
of Output Status Bytes. To reset all output bits, issue the command
with 00H for the Output Status Byte.
Output
Status
Byte
Remarks LSB Bit 3
Output D
LSB Bit 2
Output C
LSB Bit 1
Output B
LSB Bit 0
Output A
00H Reset A, B, C, D 0 0 0 0
01H Set Output A -
Reset B, C, D
0 0 0 1
02H Set Output B -
Reset A, C, D
0 0 1 0
03H Set Output A, B -
Reset C, D
0 0 1 1
04H Set Output C -
Reset A, B, D
0 1 0 0
05H Set Output A, C -
Reset B, D
0 1 0 1
06H Set Output B, C -
Reset A, D
0 1 1 0
07H Set Output A, B, C
- Reset D
0 1 1 1
08H Set Output D -
Reset A, B, C
1 0 0 0
RFID Interface
LRP2000 Long Range Passice Reader/Writer 149
09H Set Output A, D -
Reset B, C
10 0 1
0AH Set Output B, D -
Reset A, C
1 0 1 0
0BH Set Output A, B, D
- Reset C
1 0 1 1
0CH Set Output C, D -
Reset A, B
1 1 0 0
0DH Set Output A, C,
D - Reset B
1 1 0 1
0EH Set Output B, C,
D - Reset A
11 1 0
0FH Set Output A, B,
C, D
1 1 1 1
Field Content
Header 0202H
Command Size Packet length in bytes excluding the header, command
size, checksum and terminator bytes.
Command 10H
Output Status Byte 1 byte representing the desired output settings in bits 0-
3
Checksum Optional Checksum
Terminator 03H
Output
Status
Byte
Remarks LSB Bit 3
Output D
LSB Bit 2
Output C
LSB Bit 1
Output B
LSB Bit 0
Output A
RFID Interface
150 LRP820S-Series Long-Range Passive Reader/Writers
Example
The following example sets Output B only and resets A, C, and D
Command from host Response from controller
Field Content Field Content
Header 0202H Header 0202H
Command Size 0002H Response Size 0001H
Command Code 10H Command Echo 10H
Output Value
Byte
02H Checksum EEH
Checksum EBH Te r m i n a t or 03H
Terminator 03H
.
RFID Interface
LRP2000 Long Range Passice Reader/Writer 151
*******************************************************************************
ABxF Command 11H: Input Status
DESCRIPTION
Returns the status of User Inputs.
DISCUSSION
This command will interrogate the state of the User Input lines and
return a one-Byte parameter, Input Status. The least significant nibble
of the Input Status Byte is determined by the status of the outputs.
The least significant bit of this nibble corresponds to Input A. The
most significant bit of this nibble corresponds to Input D. The most
significate nibble of the Input Status Byte will be set to 0H. A closed
circuit in one(1) of the User Inputs will set the corresponding User
Input bit to one, turning the corresponding LED on. An open circuit in
one of the User Inputs will set the corresponding User Input bit to
zero, turning off the corresponding LED. The following chart shows all
of the valid hex values for the Input Status bytes.
Input Status
Byte Remarks LSB Bit 3
Input D
LSB Bit 2
Input C
LSB Bit 1
Input B
LSB Bit 0
Input A
00H Inputs A, B, C, D,
open
0 0 0 0
01H Input A, closed -
B, C, D, open
0 0 0 1
02H Input B, closed -
A, C, D, open
0 0 1 0
03H Input A, B, closed
- C, D, open
0 0 1 1
04H Input C, closed -
A, B, D, open
0 1 0 0
05H Input A, C, closed
- B, D, open
0 1 0 1
06H Input B, C, closed
- A, D, open
0 1 1 0
07H Input A, B, C,
closed - D, open
0 1 1 1
08H Input D, closed -
A, B, C, open
1 0 0 0
RFID Interface
152 LRP820S-Series Long-Range Passive Reader/Writers
Example
The following example shows only Input B is ON and A, C, and D are
OFF.
Field Content Field Content
Header 0202H Header 0202H
Command Size 0001H Response Size 0002H
Command Code 11H Command Echo 11H
Checksum EDH Input Status
Byte
02H
Terminator 03H Checksum EAH
Te r m i n a t or 03H
09H Input A, D, closed
- B, C, open
1 0 0 1
0AH Input B, D, closed
- A, C, open
1 0 1 0
0BH Input A, B, D,
closed - C, open
1 0 1 1
0CH Input C, D, closed
- A, B, open
1 1 0 0
0DH Input A, C, D,
closed - B, open
11 0 1
0EH Input B, C, D,
closed - A, open
1 1 1 0
0FH Input A, B, C, D,
closed
1 1 1 1
Field Content
Header 0202H
Command Size Packet length in bytes excluding the
header,command size, checksum
and terminator bytes.
Command 11H
Checksum Optional Checksum
Terminator 03H
Input Status
Byte Remarks LSB Bit 3
Input D
LSB Bit 2
Input C
LSB Bit 1
Input B
LSB Bit 0
Input A
RFID Interface
LRP2000 Long Range Passice Reader/Writer 153
6.5 ABx ASCII Protocol
The ABx ASCII Protocol is based on the ABx Fast protocol. It uses the
same headers and terminator (already ASCII characters) and
converts the hex value of command and data bytes to printable ASCII
(2 digit Hexadecimal notation). In another words, the hex values given
in an ABx Fast command are transmitted as separate ASCII
characters. Since it is an ASCII protocol, the Xon/Xoff handshake can
be used.
Command Packet Structure
The command protocol is based on the following minimal packet
structure. The data field and the checksum may not be present
depending on the command type and your checksum setting.
6.6 ABx ASCII Protocol Command Structure
Field Number of ASCII
Characters Content
Header 2 <STX><STX>
(02H, 02H)
Command Size 4 Packet length in bytes excluding
the header, Command size,
checksum and terminator bytes.
Command 2 Command Code
(Data) variable command data/parameters
Checksum 2 Optional Checksum
Terminator 1 <ETX>(03H)
Following a successful operation, the controller will respond with the
following. The data field and the checksum may not be present
depending on the command and your checksum setting. If a
checksum is enabled in the Configuration Menu, then it is always
present for every command.
RFID Interface
154 LRP820S-Series Long-Range Passive Reader/Writers
6.7 ABx ASCII Protocol Response Structure
Field Number of ASCII
Characters Content
Header 2 <STX><STX>
(02H, 02H)
response Size 4 Packet length in bytes excluding the header,
Command size, checksum and terminator
bytes.
Command 2 Command Echo
(Data) variable response data
Checksum 2 Optional Checksum
Terminator 1 <ETX> (03H)
If the controller encounters a fault it will respond with the following:
6.8 ABx ASCII Protocol Response Structure
Most RF operations will also require additional parameters and data
that will be included in the command stream between the command
code or echo and the terminator. The Header and Terminator are
always STX and ETX respectively. Any other field value is in ASCII
hex notation. Allowed values: '0'-'9', 'A'-'F'. Example: the value ABH
(decimal 171) in ASCII protocol is transmitted as a 2-character string
«AB», i.e. the 2 bytes: 41H 42H (ASCII values for 'A' and 'B'). The hex
Field
Number of
ASCII
Characters
Content
Header 2 <STX><STX>
(02H, 02H)
response Size 4 Packet length in bytes excluding the header,
Command size, checksum and terminator
bytes.
Error Flag 2 FFH
Error Code 2 Hex error code, see Table 11 for details
Checksum 2 Optional checksum
Terminator 1 <ETX>(03H)
RFID Interface
LRP2000 Long Range Passice Reader/Writer 155
value of the hex digits given in ASCII are: '0'-'9' = 30H - 39H, 'A'-'F' =
41H-46H. The sequence for each command is given with the
response format in the preceding section. Referring to the ABx Fast
command you can structure the ABx ASCII commands by using ASCII
values for each digit of the hex values, excluding the header and
terminator that are already ASCII characters.
Command/Response Size
The ABx ASCII requires the length of the packet be included in the
command. All parameters and data between the Command Size and
the terminator or checksum byte must be accounted for in the packet
size word. This includes all command codes and parameters such as
field definition for Block Read/Writes. The packet size remains the
same with, or without the checksum.
Checksum
The optional checksum must be enabled from the operating mode
menu to be available. The checksum is calculated by adding all the
byte values (not the ASCII translation values) in the packet (less the
values in the header, checksum if present, and terminator), discarding
byte overflow and subtracting the byte sum from FFH.
Example ASCII Command
Fill Tag
This command fills the specified number of cells from the specified
start address with the specified value. Block size = 0 means filling to
the end of the memory. The command will take the same form as the
ABx Fast command.
Field Content
Header <STX><STX>
Command Size Packet length in bytes excluding the header, command
size, checksum and terminator bytes. Given as four ASCII
character value. 0008H for this command
Command <30H><34H> (04)
Start Address 4 ASCII character value for the starting tag address
Fill Length 4 ASCII character value for the length of the fill in number
of bytes
Timeout 4 ASCII character value for timeout in 1 ms units. (1EH -
FFFEH)
RFID Interface
156 LRP820S-Series Long-Range Passive Reader/Writers
The ASCII character string for a fill of 32 bytes, from address 0 with
55H value, timeout 5 sec., follows on the next page.
Data value byte 2 ASCII character value for 1 byte of fill
Checksum 2 ASCII character value for Optional Checksum
Terminator <ETX>
Field Content
Command from host Response from controller
Field ASCII Hex
Value
ASCII
String Field ASCII Hex
Value
ASCII
String
Header 02H STX Header 02H STX
<STX><STX
>
02H STX <STX><STX
>
02H STX
Command
Size
30H 0Response
Size
30H 0
30H 030H 0
30H 031H 1
38H 830H 0
Command 30H 0Command
Echo
30H 0
34H 434H 4
Start
Address
30H 0Checksum 44H D
30H 041H A
30H 0Termi na to r s
<ETX>
03H ETX
30H 0
Fill Length 30H 0
30H 0
32H 2
80H 0
Timeout
Value
31H 1
33H 3
38H 8
38H 8
Data Byte
Value
35H 5
35H 5
Checksum 31H 1
33H 3
Terminators
<ETX>
03H ETX
RFID Interface
LRP2000 Long Range Passice Reader/Writer 157
RFID Interface
158 LRP820S-Series Long-Range Passive Reader/Writers
6.9 ABx Error Codes
Multi-tag Error Codes
The LRP2000 will return an error if it encounters a fault during
operation. Table 8 lists the possible error codes in Hexadecimal
format.
Error Code Description
04H Fill Operation has failed
05H Block Read has failed
06H Block Write has failed
07H Block Write security error
08H Search Tag Operation failed
21H Input Command does not match pre-
defined format (syntax error)
Additionally there are internal DSP errors, F1H through F5H, for use
by Escort Memory Systems technical support.
ABx Standard
ABxS error codes are returned in the LSB of the second word passed
to the host. The format of the error response is shown below.
MSB LSB Remarks
AAH FFH Command Error
00H XXH Error Code
FFH FFH Message Terminator
Example
A BlockWrite fail error message would appear as:
AAFF 0006 FFFFH.
RFID Interface
LRP2000 Long Range Passice Reader/Writer 159
ABx Fast
The format of the error response is shown in the table below.
Field Bytes Contents
Header 02H
<STX><STX> 02H
Response Size 00H 02H
Error Flag FFH
Error Code XXH
Checksum XXH
Terminators <ETX> 03H
Example
A BlockWrite fail error message would appear as:
0202 0002 FF06 F803H.
ABx ASCII
The format of the error response is shown below.
Field Number of ASCII
Characters Contents
Header
<STX><STX> 2 <STX> 02H
<STX> 02H <STX> 02H
Response Size 4Packet length in bytes excluding
the header, response
size,checksum and terminator
bytes.
Error Flag 2 FFH
Error Code 2 XXH - see Table 7 for details
Checksum 2 XXH - optional checksum
Terminators <ETX> 1 <ETX> 03H
RFID Interface
160 LRP820S-Series Long-Range Passive Reader/Writers
A BlockWrite fail error message would appear as an ASCII character
string:
<STX><STX>0002FF06F8<ETX>.
In hexadecimal the commands appear as:
02H 02H 30H 30H 30H 32H 46H 46H 30H 36H 46H 38H 03H
Multi-tag Command Error Code
When the multi-tag commands encounter a fault condition they
indicate the error in a STATUS byte returned in the response. If any of
the flag bits of the Status byte are set, then an error has occurred
during command execution. The format of the response is in all other
ways, the same as a successful response.
The STATUS byte is defined as follows:
7Reserved
6R/W Error
5 Reserved
4Internal Error
3 Timeout
2Verify Error
1 Write Security Error
0 Reserved
Some of the error conditions are the same as found in the single-tag
commands, some are new and relate only to the anticollision. If any of
the flag bits of the returned Status are set, then that condition
occurred during the command execution. Multiple conditions can
occur in the same command.
Antenna Failure There is an error at the antenna
R/W error Error during the tag memory access
Collision Collisions detected: more than one tag in the field
answered to the LRP2000 at the same time, meaning
a higher
RFID Interface
LRP2000 Long Range Passice Reader/Writer 161
Anticollision This bit is reserved
Internal Error Internal error in low-level firmware (contact Escort
Memory Systems technical assistance)
Timeout Timeout expired
Verify Error Set when re-read verification fails
Syntax Errors Syntax errors (error code 21H) will be returned in the
same format as described for the single-tag
commands.
Antenna Failure There is an error at the antenna
RFID Interface
162 LRP820S-Series Long-Range Passive Reader/Writers