Baumer Electric OIS-W-WR300303 RF-Identification System User Manual Interface

Application Not

e

OIS-W Interface Specification

 2000 Baumer Ident AG Switzerland

OIS-W Reader Communication Interface

PROJECT

PROJECT: COMMUNICATION

INTERFACE

AUTHOR: W. STEHLING

ATTN: SYSTEM INTEGRATORS

CC:

DOCUMENT

CREATED: 08. DECEMBER

1999

LAST

CHANGE: 27. SEPTEMBER 2000

VERSION: VERSION 1.1

FILE: SPWR-2101-0001.DOC

Baumer Ident AG OIS-W Interface Specificatio

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version 1.0 page: 2 / 2

Content

History

Related documents

[1]: Kühn, I., STAR2 SW Interface Specification, V 1.05 (1999/11/03), Elektrobit AG

[2]: Zehnder, C., OIS-W User's Manual, V 3.0E (1999/09/28), Baumer Ident AG, MSGY-2001-305

About the document

This application note describes the communication protocol of the OIS-W reader unit. It is intended for

system integrators who need to set up the host's part of the communication. The protocol used with the

serial interfaces will be explained in detail.

Disclaimer

The information contained in this document is believed to be accurate and reliable. It is based on the pro-

tocol stack version 2.28. However, no responsibility is assumed by Baumer Ident for its use, nor for any

infringements of patents or other rights of third parties which may result from its use. No license is

granted by implication or otherwise under any patent or patent rights of Baumer Ident.

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1 Introduction

The OIS-W reader is fully programmable, i.e. there are no switches or jumpers to set, everything can be

configured by software. Configuration parameters as well as the operating system itself may be

downloaded in the field. A host computer may be connected to each of the two serial interfaces of the ba-

sic reader unit.

The main application of the serial interfaces is to transmit status information to a host computer. If the

reader detects a valid code ID the information may be sent automatically or on request. The reader can be

configured to run continuously or to start a measurement triggered by a switch or by computer.

The protocol used to communicate with the reader is similar to the popular Siemens 3964R protocol. It

will be described in subsequent chapters.

2 Hardware requirements

The two serial interfaces of the reader are functional identical. Each may be used to connect to a host.

They differ in the physical signal levels only: the upper one corresponds electrically to RS 232, the lower

one to RS 422 levels (Table 2-1 and Table 2-2, respectively).

1 Only RxD and TxD are currently supported.

2 Internally connected to GND via 195 Ω.

Signal Level RS232

Baud rates

default 9600 baud

optional 115'200 baud

Parameter 8 bit, 1stop bit, no parity

Connector 9-Pin D-Sub, male (DTE)

Pin Assignment 1 DCD

DSR 6 2 RxD

RTS 7 3 TxD

CTS 8 4 DTR

RI 9 5 GND

Table 2-1: RS 232 serial interface of the basic OIS-W reader unit1

Signal level: RS422

Baud rates:

default 9600 baud

optional 115'200 baud

Parameter 8 bit, 1stop bit, no parity

Plug 9-Pin D-Sub, female (DTE)

Pin assignment 5 GND2

RxD- 9 4

RxD+ 8 3

TxD+ 7 2

TxD- 6 1 GND2

Table 2-2: RS 422 serial interface of the basic OIS-W reader unit

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3 Reader operating modes

Basically, the reader may operate in one of two main modes: triggered or free running. In triggered mode

a new measurement starts as soon as an external signal is supplied or a trigger message from the host is

received. In free running mode the reader is looking continuously for a valid identification.

An identification message (or an appropriate error message in triggered mode) can be sent to a host in

two ways: automatically or on request by the host. Usually, the automatic ID data message is sufficient in

most applications.

The functionality of the reader is controlled by a configuration file that allows setting of all parameters.

Figure 3-1 shows the part of the configuration file dealing with the communication. The other parts of the

file are not subject of this documentation. For further details see [2].

// BAUMER IDENT SAW tag reader STAR2

// configuration data

// date: 09.06.1999

// time: 10:03:45

// settings serial interface

Bdrate RS422 1152 Baud rate RS422 IF [ 12.. 1152]

Bdrate RS232 1152 Baud rate RS232 IF [ 12.. 1152]

Msg Type ID 11 select type of notification after successful reading [ 0.. 19]

TidF 2 s time const ID filter (res:.5s) [0.5..32767]

ID Msg Retry 2 max. number transmissions of ID Msg(0=no maximum) [ 0.. 255]

ID Msg Timeout 2 s time until ID msg is retransmitted (res:0.5s, 0=no limit) [ 0..127.5]

// settings auxiliary ports

:

Aux over RS 422 0 choose RS422 interface for Aux State Indication message (0 = OFF; 1 = ON)

[ 0.. 1]

Aux over RS 232 0 choose RS232 interface for Aux State Indication message (0 = OFF; 1 = ON)

[ 0.. 1]

Aux IN 1 Rep 1 Aux State Indication mask (0 = OFF; 1 = ON) [ 0.. 1]

Aux IN 2 Rep 1 Aux State Indication mask (0 = OFF; 1 = ON) [ 0.. 1]

Aux OUT 1 Rep 1 Aux State Indication mask (0 = OFF; 1 = ON) [ 0.. 1]

Aux OUT 2 Rep 1 Aux State Indication mask (0 = OFF; 1 = ON) [ 0.. 1]

Figure 3-1: The section of the reader configuration file dealing with communication

3.1 Automatic Data Transmission

Several parameters of the configuration file describe the automatic messaging (Figure 3-1):

• The MsgTypeID entry of the configuration file defines the way how and where an automatic ID

message will be sent. The first digit designates the interface (0: RS 422, 1: RS 232), the second digit

indicates the message type (0: no message, 1: TAG_ID_IND, 2: PARAM_DATA). The message details

will be explained below.

• TidF is a filter time constant. The same message is sent again after this time has elapsed, if the same

ID code is detected repeatedly.

• IDMsgRetry gives the number of repetitions the message will be transmitted, if the host does not

acknowledge the telegram. The parameter is set to 0, if an acknowledge is mandatory; it is set to 1, if

an acknowledge might be missing.

• IDMsgTimeout is the time to wait for acknowledge between the repetitions.

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Note: The host can define the readout rate by delaying the acknowledge of the previous

message appropriately.

• Aux over RS 422 if the value is set to ”1” the reader sends its AUX_REP message to the RS 422

interface

• Aux over RS 232 if the value is set to ”1” the reader sends its AUX_REP message to the RS 232

interface

• Aux IN 1 Rep represents the digital input from antenna 1. If the value is set to ”1” the reader

sends its AUX_REP message if a change of state on this pin is detected, the flag for this pin is set if

any change since the former message is detected

• Aux IN 2 Rep represents the digital input from antenna 2. If the value is set to ”1” the reader

sends its AUX_REP message if a change of state on this pin is detected, the flag for this pin is set if

any change since the former message is detected

• Aux OUT 1 Rep represents the digital output from antenna 1. If the value is set to ”1” the reader

sends its AUX_REP message if a change of state on this pin is detected, the flag for this pin is set if

any change since the former message is detected

• Aux OUT 2 Rep represents the digital output from antenna 2. If the value is set to ”1” the reader

sends its AUX_REP message if a change of state on this pin is detected, the flag for this pin is set if

any change since the former message is detected

Note: If no interface is set, no AUX_REP message is sent, until the host sends an AUX_REQ

message. The further parameters have no effect in case of inactive serial interfaces.

For further information see table 5-12.

There are four messages that can be transmitted automatically by the reader. The first one is the reset in-

dicator (RESET_IND), which is sent through both interfaces simultaneously. The host's software must be

aware that a reset message may arrive any time to indicate that the reader has been initialized.

The next two messages are TAG_ID_IND and PARAM_DATA_REP. One of them (not both) may be sent

to any serial interface (not both) as described by MsgTypeID (see above). While TAG_ID_IND sends

the ID code information only, PARAM_DATA_REP gives additional information about the measurement.

Both messages may also be requested by the host (TAG_ID_REQ and DATA_REQ respectively).

The last message to be transmitted automatically, is the AUX_REP. Conditions for sending the informa-

tion without request by the host, are as follows.

The parameters Aux over RS422 and / or Aux over RS232 are set. Further, minimum one of the

Aux…Rep must be set. Now a message will be sent by the reader, if one of the desired auxiliary ports

changes. In case of setting both interfaces, the message is send on each simultaneously. If no desired Aux

State is set (all port parameters to zero and any interface set to “1”) a message won’t be sent in no case. If

AUX_REP is sent, you get information of all actual auxiliary port states. You get also information about

which state did change since the last message was sent.

3.2 Communication upon request

All other messages are generally initiated by the host. They can be grouped into request messages (for in-

stance status of the reader) or commands to the reader (for instance download of configuration data). De-

pending on the application a host's application software may not be concerned with these messages at all.

Usually they are used at installation time to configure a reader properly.

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3.3 Code lookup table

Basically, each tag returns a decimal number between 0 and 10x-1 with "x" defined by the tag specifica-

tion Dx. Tags of the D4 range, for instance, allow for 10'000 individual codes. The reader unit can trans-

fer an identified number in two ways:

• unchanged and exactly as read from the tag

• converted by using a code lookup table to give more freedom in adapting an application

All readers will be delivered with lookup table enabled, even if it holds a one to one code translation

only. Figure 3-2 shows an example of a code lookup table. Simple text files of this kind are, for instance,

used by Baumer Idents basic service software.

table type 0

output coding 0

output length 6

input length 3

154 111000

157 987654

Figure 3-2: Example of a code lookup table

Only table type 0 is currently supported. It means that only one to one entries will be accepted.

Only output coding 0 is currently supported. It means that each output character will be coded internally

in packed binary format (4 bit) and only the hex values 0x0 … 0xf are allowed.

The output length may be selected between 1 and 255. The basic service software currently supports out-

put lengths up to 16 characters.

The input length must correspond to the range of the tags in use. If D3 tags are installed, input length

must be set to 3, otherwise no valid reading can take place.

The remainder of the file holds lookup entries line by line. The output code is separated from the input

code by white space characters. While the input codes must be unique the same output code may be as-

signed to various input codes.

If the reader identifies an input code not contained in the lookup table, the readers output depends on its

main operating mode. In free running mode no message will be sent3. In triggered mode the reserved out-

put code NO_READ will be transmitted. NO_READ is coded as 0xffffff (number of characters = output

length).

3 This is true for the TAG_ID_IND message. The PARAM_DATA_REP message will transmit the input code instead.

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4 rotocol overview

The communication protocol is similar to the Siemens 3964R protocol.

4.1 General message structure

The general structure of a message is shown in Table 4-1. Following the START byte the MSG_NR indi-

cates unambiguously the message. The next two bytes hold the length of an optional data array (high and

low byte of a 16-bit number respectively). The message ends with a checksum byte and an END of mes-

sage indicator. The checksum is calculated over all bytes except START, CRC and END. The calculation

of the cyclic redundancy check is detailed in appendix 0. The data fields are optional and may be omit-

ted.

byte offset message bytes comment

0 START = 0x02 start of message indicator

1 MSG_NR message number

2 HI MSG_LEN high byte message length Cyclic

3 LO MSG_LEN low byte message length Redundancy

4 [DATA (0)] first data byte [optional] check

3 + MSG_LEN [DATA (MSG_LEN-1)] last data byte [optional] CRC

4 + MSG_LEN ~CRC logically inverted CRC checksum

5 + MSG_LEN END = 0x03 end of message indicator

Table 4-1: General structure of a message

Usually, a message sent by the reader or by the host must be acknowledged by the other one. The reader

may be configured to repeat an automatic message a number of times, if the acknowledge is missing (see

chapter 3.1). Two forms of acknowledge messages are possible depending on the type of the primary

message:

• Often a general acknowledge message type as shown in Table 4-2 will be used. The host replies in

this way to automatically transmitted messages. The same type of acknowledge is sent in most cases

by the reader as reply to commands from the host.

• On requests of the host the reader answers with an explicit reply message. An additional acknowledge

will not be sent, neither by the host nor by the reader.

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byte offset message bytes example comment

0 START 0x02

start of message indicator

1 MSG_ACK 0x11

message acknowledge number Cyclic

2 HI MSG_LEN 0x00 high byte message length Redundancy

3 LO MSG_LEN 0x01 low byte message length check

4 MSG_NR 0x22

number of primary message CRC

3 ~CRC 0x68

logically inverted CRC checksum

4 END 0x03

end of message indicator

Table 4-2: General message acknowledge

The general acknowledge message as shown in Table 4-2 replies the message number of the primary

message in the data field. In the example the reader has acknowledged a «set mode request» message

(SET_MODE_REQ = 0x22) of the host.

In many messages an ANTENNA parameter is transmitted. It distinguishes between antenna 1 and antenna

2 of a dual channel OIS-W reader model.

4.2 Data coding and byte order

Unfortunately, the coding of data, especially of numbers, is not consistent. For instance, each message

header holds the message length that should be interpreted as a 16-bit binary number (cf. bytes #2 and #3

in Table 4-2). This number is transmitted by sending the most significant byte (MSB) first followed by

the least significant byte (LSB).

On the other hand, the TAG_ID_IND message uses a different coding of the tag code. As an example the

decimal ID number 157 is transmitted as 0x07 0x05 0x01, that is a binary code with one byte per

digit and the least significant digit (LSD) going first.

Appendix B lists all defined messages and their parameters. The corresponding C/C++ type definitions

are given in Appendix C3. To avoid any confusion due to data coding and byte order all examples will be

broken down to byte level.

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5 Communication messages

This chapter gives typical examples of the most important messages in full detail. A complete list

of all messages is given in appendix Appendix B: .

Table 5-1 shows the definitions used to describe the basic data type sizes (cf. Appendix C2).

type description size range type description size range

UINT8 unsigned byte 1 byte 0 … 255 INT8 signed byte 1 byte -128 … 127

UINT16 unsigned word 2 byte 0 … 65'535 INT16 signed word 2 byte -32'768 … 32'767

UINT32 unsigned long 4 byte 0 … 4'294'967'295 INT32 signed long 4 byte -2'147'483'648 …

2'147'483'647

Table 5-1: Data size definitions

5.1 Automatically transmitted messages

5.1.1 TAG_ID_IND: Send code information

This message is a short version of PARAM_DATA_REP.

byte variable basic type example comment

0 START UINT8 0x02

start of message indicator

1 MSG_NR UINT8 0x50

TAG_ID_IND message

2 HI_MSG_LEN UINT16 0x00

length of data field

3 LO_MSG_LEN 0x04

4 bytes to transmit

4 ANTENNA UINT8 0x01 channel number (ANT_1 = 1, ANT_2 = 2)

5 LO_ID UINT8 [length-1] 0x07 least significant digit of ID code

6 … 0x05 (example code = 157)

7 HI_ID 0x01

8 ~CRC UINT8 0x42

logically inverted CRC

9 END UINT8 0x03

end of message indicator

Table 5-2: Automatically transmitted tag ID message from the reader

Note: This message is of variable length. The ID may have up to 16 digits. Therefore the

message length is limited to 2 ≤ length ≤ 17.

byte variable basic type example comment

0 START UINT8 0x02

start of message indicator

1 MSG_NR UINT8 0x11

MSG_ACK message

2 HI_MSG_LEN UINT16 0x00

length of data field

3 LO_MSG_LEN 0x01

1 byte to transmit

4 MSG_NR UINT8 0x50 message to acknowledge: TAG_ID_IND

5 ~CRC UINT8 0x5c

logically inverted CRC

6 END UINT8 0x03

end of message indicator

Table 5-3: Acknowledge of TAG_ID_IND message from the host

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5.1.2 PARAM_DATA_REP: Send extended code information

byte variable basic type example comment

0 START UINT8 0x02

start of message indicator

1 MSG_NR UINT8 0x45

PARAM_DATA_REP message

2 HI_MSG_LEN UINT16 0x00

length of data field

3 LO_MSG_LEN 0x39

57 bytes to transmit

4 INVALID UINT8 0x01 set to 1 if data are invalid

5 LO_ID UINT8 [CODE_MAX_LEN] 0x07 least significant digit of ID code

6 … 0x05 (example code = 157)

7 … 0x01

8 … 0xff unused bytes are filled with 0xff

… … …

20 HI_ID 0xff

21 AF_AGC UINT8 0x00 automatic gain control

22 NOISE_LEVEL UINT8 0x20 maximum noise level in spectrum

23 CAL_MAGNITUDE UINT8 0x48 signal strength of calibrator (in 0.5 dBr)

24 CAL_SHIFT INT8 0x01 description of tag properties

25 FIRST_TAP_POS UINT8 0x3d

26 DELTA_LAST_TAP_POS UINT8 0x36

27 ANTENNA UINT8 0x01 channel number (ANT_1 = 1, ANT_2 = 2)

28 BLOC UINT8 [CODE_MAX_LEN+1] 0x00 description of tag properties

… … … …

44 … … 0x00

45 BLOC_MAGNITUDE UINT8 [CODE_MAX_LEN] 0x46 signal strength of code blocs (in 0.5 dBr)

46 … 0x46 i.e. 0x46 hex → 70 decimal → 35 dBr

47 … 0x48

48 … 0x00 ignore unused blocs (set to 0)

… … …

60 … 0x00

61 ~CRC UINT8 0xda

logically inverted CRC

62 END UINT8 0x03

end of message indicator

Table 5-4: Parameter data reply message

The interesting data fields are CAL_MAGNITUDE and BLOC_MAGNITUDE that give an idea of the re-

ceived signal strengths.

Note: This message uses fixed length records. Unused bytes are filled appropriately.

byte variable basic type example comment

0 START UINT8 0x02

start of message indicator

1 MSG_NR UINT8 0x11

MSG_ACK message

2 HI_MSG_LEN UINT16 0x00

length of data field

3 LO_MSG_LEN 0x01

1 byte to transmit

4 MSG_NR UINT8 0x45 message to acknowledge: PARAM_DATA_REP

5 ~CRC UINT8 0xff

logically inverted CRC

6 END UINT8 0x03

end of message indicator

Table 5-5: Acknowledge of PARAM_DATA_REP message from the host

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5.1.3 RESET_IND: Reset indication of reader

byte variable basic type example comment

0 START UINT8 0x02

start of message indicator

1 MSG_NR UINT8 0x51

RESET_IND message

2 HI_MSG_LEN UINT16 0x00

length of data field

3 LO_MSG_LEN 0x01

1 byte to transmit

4 RESET_NR UINT8 0x00 eventually holds initialization error number

5 ~CRC UINT8 0xd2

logically inverted CRC

6 END UINT8 0x03

end of message indicator

Table 5-6: Reset indication from reader

The RESET_NR is 0 if the reader was reset successfully. Possible error numbers are 0xf1 and 0xf2 (see

appendix C5).

Note: This message is sent to both interfaces simultaneously and must not be acknowl-

edged.

5.2 Request Information from reader

5.2.1 VERSION_REQ: Get software version information from reader

byte variable basic type example comment

0 START UINT8 0x02

start of message indicator

1 MSG_NR UINT8 0x3a

VERSION_REQ message

2 HI_MSG_LEN UINT16 0x00

length of data field

3 LO_MSG_LEN 0x00

(no data field)

4 ~CRC UINT8 0xd5

logically inverted CRC

5 END UINT8 0x03

end of message indicator

Table 5-7: Host asks for reader software version

Note: This message has no data field. The request is acknowledged by sending the version

information.

byte variable basic type example comment

0 START UINT8 0x02

start of message indicator

1 MSG_NR. UINT8

0x4a

VERSION_REP message

2 HI_MSG_LEN UINT16 0x00

length of data field

3 LO_MSG_LEN 0x05

5 byte to transmit

4 V_DAY UINT8 0x19 day of release (19)

5 V_MONTH UINT8 0x0a month of release (10)

6 V_YEAR UINT8 0x63 year of release (99)

7 VERSION UINT8 0x02 version (2)

8 REVISION UINT8 0x1c revision (28)

9 ~CRC UINT8 0x65

logically inverted CRC

10 END UINT8 0x03

end of message indicator

Table 5-8: Version reply from reader

Only the lower 7 bits of REVISION are used to express the revision number. The MSB indicates

whether this message contains version information of the OIS-W boot loader (bit 7 = 1) or of the DSP

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operating system (bit 7 = 0). The boot loader does only respond if the DSP cannot find a valid program to

execute following reset or power up.

5.3 Information transmitted to the reader

5.3.1 DOWNLOAD_REQ: Download lookup table to reader

The download request is a fixed length message that is used to transmit DSP software (type = 0), ramp

controller software (type = 1), or a lookup table (type = 2). The data array is broken into blocks of size

DOWNLOAD_MSG_SIZE byte each (currently set to 32). Unused bytes are filled appropriately.

byte variable basic type example comment

0 START UINT8 0x02

start of message indicator

1 MSG_NR UINT8 0x10

DOWNLOAD_REQ message

2 HI_MSG_LEN UINT16 0x00

length of data field

3 LO_MSG_LEN 0x25

fixed length: 37 byte to transmit

4 TYPE UINT8 0x02 download lookup table (type = 2)

5 LO_BLOCKS UINT16 0x02 total number of blocks to transmit

6 HI_BLOCKS 0x00

7 LO_BLOCK_NR. UINT16 0x01 number of blocks that will follow this message

8 HI_BLOCK_NR. 0x00

9 MAGIC_WORD UINT8[16] 0x63 c

10 0x6f o

11 0x64 d

12 0x65 e

13 0x20 space

14 0x74 t

15 0x61 a

16 0x62 b

17 0x6c l

18 0x65 e

19 0x20 space

20 0x70 p

21 0x63 c

22 0x20 space

23 0x20 space

24 0x20 space

25 TABLE_TYPE UINT8 0x00

26 OUTPUT_CODING UINT8 0x00

27 OUTPUT_LENGTH UINT8 0x06

28 INPUT_LENGTH UINT8 0x03

29 LO_NUM_OF_ENTRIES UINT32 0x02 number of entries in table

30 | 0x00

31 | 0x00

32 HI_NUM_OF_ENTRIES 0x00

33 0x00 fill bytes set to 0

… …

40 0x00

41 ~CRC UINT8 0x1c

logically inverted CRC

42 END UINT8 0x03

end of message indicator

Table 5-9: Download lookup table to reader. The first block describes the table parameters.

The first block transmitted contains the table parameters as described in chapter 3.3. The example corre-

sponds to Figure 3-2.

Note: UINT16 and UINT32 values in the data field use a different byte order than the mes-

sage length field.

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The reader responds with a download reply message that echoes the TYPE field:

byte variable basic type example comment

0 START UINT8 0x02

start of message indicator

1 MSG_NR UINT8 0x15

DOWNLOAD_REP message

2 HI_MSG_LEN UINT16 0x00

length of data field

3 LO_MSG_LEN 0x01

1 byte to transmit

4 TYPE UINT8 0x02 reply to lookup table download (type = 2)

5 ~CRC UINT8 0x09

logically inverted CRC

6 END UINT8 0x03

end of message indicator

Table 5-10: Download reply message from reader.

The next block(s) transmit the actual lookup table entries:

byte variable basic type example comment

0 START UINT8 0x02

start of message indicator

1 MSG_NR UINT8 0x10

DOWNLOAD_REQ message

2 HI_MSG_LEN UINT16 0x00

length of data field

3 LO_MSG_LEN 0x25

fixed length: 37 byte to transmit

4 TYPE UINT8 0x02 download lookup table (type = 2)

5 LO_BLOCKS UINT16 0x02 total number of blocks to transmit

6 HI_BLOCKS 0x00

7 LO_BLOCK_NR. UINT16 0x00 number of blocks that will follow this message

8 HI_BLOCK_NR 0x00

9 PACKED_DATA UINT8 0x45 packed binary (4 bit per digit), least significant

10 [DOWNLOAD_MSG_SIZE] 0x10 nibble goes first:

11 0x00 451 000111 751 456789

12 0x11

13 0x17 should be interpreted as:

14 0x51 154 111000

15 0x45 157 987654

16 0x67

17 0x89

18 0x00 unused nibbles set to 0

… …

40 0x00

41 ~CRC UINT8 0x97

logically inverted CRC

42 END UINT8 0x03

end of message indicator

Table 5-11: Download lookup table to reader. The remaining blocks transmit the table entries in packed form.

The reader acknowledges using again the message shown in Table 5-10.

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5.4 Auxiliary Port Information and Settings

The required coding for sending correct messages to the reader and getting the desired information cor-

rectly are described in the table below.

Name of variable Description Range Def Remarks

auxchind_cfg.aux_chinden

Enable/disable indication about

change of state at AUX ports on

RS422 or RS232 serial interface.

(Set corresponding bit to enable AUX

state change indication on an inter-

face)

0..3 0 bit 0: RS422

(=LSB)

bit 1: RS232

auxchind_cfg.aux_ chindmsk AUX state change indication mask

(Set bit to enable indication of state

change of corresponding input or

output. Has no effect if AuxChIndEn

is 0)

0..31 0 bit 0: AUX 1_IN (=LSB)

bit 1: AUX 2_IN

bit 2: AUX 1_OUT

bit 3: AUX 2_OUT

bit 4: SYNC_IN (not used)

Table 5-12: Description of aux port scan encoding

Note: For software structures the paramter SYNC_IN exists, but it’s not used at the moment.

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Appendix A: CRC calculation

The CRC polynomial is x7 + x3 + 1. CRC is calculated over the MSG_NR, MSG_LEN and DATA fields,

"~CRC" means that the calculated CRC byte is transmitted as the ones-complement (bit wise negated).

The DATA field is optional as some messages do not contain data. The message length is equal to the

number of bytes in the data field. Figure A-1 shows a subroutine to calculate CRC using a lookup table.

This is a fast method for speed critical applications. Figure A-2 shows a subroutine to calculate CRC in

the classical way. Figure A-3 shows an example how to calculate CRC of a message.

void Msg_CRC(UINT8 in, INT16* state)

/*--------------------------------------------------------------------------+

| Description: |

| |

| Does 8-bit cyclic redundancy check on one data byte |

| CRC polynomial is x^7 + x^3 + 1 |

| Returns the current state |

+--------------------------------------------------------------------------*/

{

static const crc_tab[16] = {

0, 18, 36, 54, 72, 90, 108, 126, 144, 130, 180, 166, 216, 202, 252, 238};

*state = crc_tab[(*state ^ in) & 0xF] ^ (*state >> 4);

in >>= 4;

*state = crc_tab[(*state ^ in) & 0xF] ^ (*state >> 4);

}

Figure A-1: CRC calculation using a lookup table

void Msg_CRC(unsigned char in, int* state)

/*--------------------------------------------------------------------------+

| Description: |

| |

| Does 8-bit cyclic redundancy check on one data byte |

| CRC polynomial is x^7 + x^3 + 1 |

| Returns the current state |

+--------------------------------------------------------------------------*/

{

#define CRC_POLYN 0x120 //Note that MSB is state input (0x90 << 1)

INT16 j;

for (j = 0; j < 8; j++) {

if ((*state ^ in) & 1)

*state ^= CRC_POLYN;

in >>= 1;

*state >>= 1;

}

Figure A-2: CRC calculation using algorithm

void Calc_CRC()

{

INT16 crc=0; // state register of CRC

Msg_CRC(MSG_NR,&crc);

Msg_CRC(HI_MSG_LEN,&crc);

Msg_CRC(LO_MSG_LEN,&crc);

Msg_CRC(DATA_BYTE[0],&crc);

// ...

Msg_CRC(DATA_BYTE[N-1],&crc); // CRC checksum is now contained in crc

crc =

~crc; // logically invert

}

Figure A-3: Application example for CRC calculation

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Appendix B: OIS-W messages

In the following descriptions only the message number MSG_NR and the data field(s) are listed. Start

byte, length, CRC and end byte must be added to get the full message (see Table 4-1 for complete mes-

sage structure). The initiator message is listed on the first lines followed by the response.

The identifiers are defined in appendix Appendix C: .

1 Automatically transmitted messages

from host from reader comment

TAG_ID_IND

UINT8 antenna

UINT8 id[tlen]

tag identification number and the antenna where it is received

tlen = length of Tag or length of output code in code table

MSG_ACK

UINT8 msg_nr

general message acknowledge on message msg_nr

(msg_nr = TAG_ID_IND)

PARAM_DATA_REP

struct TINFO tag_info

tag identification number, antenna and further information about the tag

MSG_ACK

UINT8 msg_nr

general message acknowledge on message msg_nr

(msg_nr = TAG_ID_IND)

AUX_REP

struct AUX

aux_status

contains present aux port settings

MSG_ACK

UINT8 msg_nr

✠

general message acknowledge on message msg_nr

(msg_nr = AUX_REP)

RESET_IND

UINT8 reset_nr

contains number for possible error during initialization, zero on success

Note that the RESET_IND is sent to both interfaces at the same time!

Table B-12: Automatically transmitted messages by the reader

The reader can be configured to send either a TAG_ID_IND message or a PARAM_DATA_REP message

automatically. The RESET_IND message is always sent by the reader after a successful initialization.

Please note that no acknowledge for RESET_IND is expected.

2 Request information from the reader

A host can get information from the reader as described in Table B-13. Please note that the automatic

PARAM_DATA_REP (Table B-12) leads to the same message as the reply to a DATA_REQ with parame-

ter PARAM_DATA_REP.

✠ MSG_ACK is optional, but flags for actual state change report will not be reset when an acknowledge on an AUX_REP message isn’t send

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from host from reader comment

VERSION_REQ Ask for SW Version

VERSION_REP

UINT8 version [5]

Reply SW version number and release date

CONFIG_REQ get tag structure and reader configuration

CONFIG_REP

struct CONFIG act_conf

contains requested configuration

SER_CONFIG_REQ get interface configuration

SER_CONFIG_REP

struct SER_CONFIG act_conf

contains requested configuration

AUX_REQ get present state of aux port

AUX_REP

struct AUX aux_status

contains present aux port settings

MODE_REQ get present main mode and sub-modes

MODE_REP

UINT8 main

UINT8 tx_untriggered

UINT8 biased

UINT8 synch

UINT8 random

UINT8 Tm

UINT8 Nmess

UINT8 Tdmin[2]

UINT8 Tdlen[2]

UINT8 Tsleep[2]

UINT8[CODE_MAX_LEN]biased_id

UINT8[CODE_MAX_LEN]analyz_id

UINT8 CwChannel

UINT8 TxEnable

contains present mode,

sub modes,

biased id number, analyze id number, settings for Test mode

random = 0: random mode off, 1: random mode on

Tm: number of iterations in trigger loop

Nmess: number of measurements in Random triggered mode

Tdmin, Tdlen, Tsleep: initial delay, random time, sleep time in

random mode

CwChannel = 0: Test mode off, 2..81: valid continuous wave

channel

TxEnable = 0: transmitter in test off, 1: transmit antenna 1,

2: transmit antenna 2

CODE_PP_REQ request installation and family code

CODE_PP_REP

PP_SETTINGS codes

actual installation and family code

AUX_CONFIG_REQ request output port configuration

AUX_CONFIG_REP

AUXALL_CONFIG[2] aux_config

actual output port configuration

TAG_ID_REQ get last valid ID

TAG_ID_IND

UINT8 code.antenna

UINT8code.num[CODE_MAX_LEN]

last valid tag id at antenna 1 or 2

In case there has never been received a valid tag id, the

reader responses with a data field containing NO_READ

IF_ERROR_REQ request interface errors of both interfaces

IF_ERROR_REP

UINT32 [if_error_array]

Errors on both interfaces, cumulative counting

DATA_REQ get data vector: time, frequency, save or/and parameter

UINT8 data_msg

TIME_DATA_REP

INT8[SBUF_LEN]

or/and

SAVE_DATA_REP

INT16 SBUF_LEN

INT16[SBUF_LEN]

INT16 PARAM_LEN

INT16 AF_AGC

INT16 ANTENNA

or/and

FREQ_DATA_REP

UINT8[ABUF_LEN]

or/and

PARAM_DATA_REP

struct TINFO tag_info

contains data time vector, data save vector, data freq vector

or data param vector (1 up to 3 messages can be received

according to the data_msg value in DATA_REQ)

TINFO contains information on Valid/Invalid tag, Tag ID num-

ber, Tag Errors during detection, Antenna information, AF at-

tenuation (AGC) values

CODE_TABLE_REQ Upload complete postprocessing code table

UINT8 block_nr

CODE_TABLE_REP

UINT16 blocks

UINT16 block_nr

UINT8[DOWNLOAD_MSG_SIZE]

Blockwise request of code table addressed by block_nr

ANALYZ_RESULT_REQ get analyze mode results

ANALYZ_RESULT_REP

struct ANALYZ

contains analyze mode results

ERROR_ARRAY_REQ get error array

ERROR_ARRAY_REP

UINT8 error_array[ERR_MAX]

contains error array, every position of error_array despite posi-

tion zero contains a counter that indicates how many times the

error has occurred since the last reset

Table B-13: Messages that request information from the reader

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3 Information transmitted to the reader

from host from reader meaning

SET_CONFIG_REQ set tag structure and reader configuration parameter(s)

struct CONFIG new_conf

MSG_ACK

UINT8 msg_nr

general message acknowledge

msg_nr = SET_CONFIG_REQ

SET_SER_CONFIG_REQ set interface configuration parameter(s)

struct SER_CONFIG new_conf

MSG_ACK

UINT8 msg_nr

general message acknowledge

msg_nr = SET_SER_CONFIG_REQ

SET_AUX_REQ set aux port

UINT8 aux_out

MSG_ACK

UINT8 msg_nr

general message acknowledge

msg_nr = SET_AUX_REQ

SET_MODE_REQ

UINT8 main

UINT8 tx_untriggered

UINT8 biased

UINT8 sync

UINT8 random

UINT8 Tm

UINT8 Nmess

UINT8 Tdmin[2]

set main mode and sub-modes

UINT8 Tdlen[2]

UINT8 Tsleep[2]

MSG_ACK

UINT8 msg_nr

general message acknowledge

msg_nr = SET_MODE_REQ

SET_BIASED_ID_REQ set id for biased mode

UINT8[CODE_MAX_LEN] biased_id

MSG_ACK

UINT8 msg_nr

general message acknowledge

msg_nr = SET_BIASED_ID_REQ

SET_TRIGGER_REQ

UINT8 antenna triggers reader (SW trigger)

antenna = 1, trigger antenna 1

antenna = 2, trigger antenna 2

antenna = 3, tirgger both antennas

MSG_ACK

UINT8 msg_nr

general message acknowledge

msg_nr = SET_TRIGGER_REQ

SET_CODE_PP_REQ set installation and family code

PP_SETTINGS codes

MSG_ACK

UINT8 msg_nr

general message acknowledge

msg_nr = SET_CODE_PP_REQ

SET_AUX_TRIG_REQ Host trigger output AOUT1 or AOUT2

UINT8 aux_host_trigger

MSG_ACK

UINT8 msg_nr

general message acknowledge

msg_nr = SET_AUX_TRIG_REQ

SET_AUX_CONFIG_REQ set output port configuration for AOUT1 and AOUT2 as for the in-

formation about the complete auxiliary port ; resets aux flags

AUXALL_CONFIG[2] aux_config

MSG_ACK

UINT8 msg_nr

general message acknowledge

msg_nr = SET_AUX_CONFIG_REQ

SET_ANALYZ_ID_REQ set id for analyze mode and reset counter

UINT8[CODE_MAX_LEN]

MSG_ACK

UINT8 msg_nr

general message acknowledge

msg_nr = SET_ANALYZ_ID_REQ

DOWNLOAD_REQ

UINT8 type

UINT16 blocks

UINT16 block_nr

UINT8[DOWNLOAD_MSG_SIZE]

contains new downloadable file

DOWNLOAD_MSG_SIZE=32

possible types are DSP_SW=0, FPGA_SW=1, CODE_TABLE=2

after reception of the all blocks an automatic reset is issued for

DSP_SW and FPGA_SW, block_nr counts from blocks-1 down to

zero

DOWNLOAD_REP

UINT8 type

acknowledge for each block

SET_TEST_REQ

UINT8 cw_channel

UINT8 tx_enable

enters or leaves test mode

CwChannel = 0 leaves test mode; CwChannel = 2..81 enters test

mode, TxEnable = 0: TX off, 1: antenna 1 on, 2: antenna 2 on

MSG_ACK

UINT8 msg_nr

general message acknowledge

msg_nr = SET_TEST_REQ

SET_MONITOR_REQ

UINT8 antenna

UINT8 beeper

Sets Display filter in antenna alternating mode, sends only

DATA_REP messages from ANT_1 or ANT_2 or both antennas

(default). Beeper can be enabled =1, beeps on every valid tag ID.

This setting is volatile, after reset the default setting is assumed.

MSG_ACK

UINT8 msg_nr

general message acknowledge

msg_nr = SET_DISPLAY_REQ

RESET_REQ reset DSP SW

RESET_IND

UINT8 reset_nr

contains number for possible error during initialization,

zero on success

Table B-14: Messages that the host may send to the reader

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Appendix C: C/C++ header definitions

1 Global Definitions

/*** general definitions sorted alphabetically ***/

#define ABUF_LEN 300

#define ABUF_NUM 2

#define ANT_1 1

#define ANT_2 2

#define ANT_ALTERNATING 0

#define AUX_DELAYED_IMPULSE 0

#define AUX_DELAYED_TURN_OFF 1

#define AUX_HOST_TRIG 2

#define AUX_ID_TRIG_FILT 1

#define AUX_ID_TRIG_TRANSP 0

#define AUX_TAG_ACK 3

#define BOTH_IF 3

#define CODE_MAX_LEN 16

#define CODE_MAX_LEN1 17

#define CORRECTION_ERROR 0x04

#define DATA_IF 1

#define DOWNLOAD 2

#define EMPTY_BUFFER 0xEE

#define EVENT_DRIVEN_ID 0

#define FREQ_DATA 0x2

#define FULL_BUFFER 0xFF

#define ID_FIFO_LEN 4

#define INVALID_ELSE 0x003

#define INVALID_INSTALLATION_C 0x002

#define INVALID_NOFM 0x001

#define MASTER 0

#define MULTIPLE_PEAKS 0x02

#define OFF 0

#define ON 1

#define PARAM_DATA 0x4

#define PEAK_BELOW_SNR 0x01

#define RMOD_EXPONENTIAL 2

#define RMOD_GAUSS 3

#define RMOD_UNIFORM 1

#define SAVE_DATA 0x8

#define SBUF_LEN 512

#define SBUF_NUM 5

#define SERVICE_IF 2

#define SLAVE 1

#define TAP_CORRECTED 0x80

#define TIME_DATA 0x1

#define TIME_OUT 0xFD

#define TIME_OUT2 0xFC

#define TOO_MANY_CORRECTIONS 0x08

#define TRIG1 1

#define TRIG2 2

#define TRIGB 3

#define TRIGGERED_ID 1

#define TYP_PARID_DA 02

#define TYP_PARID_SI 12

#define TYP_TAGID_DA 01

#define TYP_TAGID_SI 11

#define VALID_TAG 0x000

#define ZERO_IF 0

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2 Size definition of variables

/*** Size Definition of Variables ***/

typedef unsigned char UINT8;

typedef unsigned int UINT16;

typedef unsigned long UINT32;

typedef char INT8;

typedef int INT16;

typedef long INT32;

3 Structure definitions

/*** structure definitions ***/

typedef struct { UINT8 *start;

INT16 len;

volatile in;

volatile out; } BUFOBJ;

typedef enum { RAND_OFF,

RAND_TD_MIN,

RAND_GENERATE,

RAND_RUN,

RAND_SLEEP } RANDOM_STATE;

typedef enum { TRIG_OFF,

TRIG_PREP,

TRIG_IND,

TRIG_IND1,

TRIG_RUN } TRIG_STATE;

typedef struct { UINT8 flag;

float array[ABUF_LEN]; } ABUF;

typedef struct { UINT32 Total_ids;

UINT32 Invalid_ids;

UINT32 Wrong_but_valid_ids;} ANALYZ;

typedef struct { UINT8 aux_chinden;

UINT8 aux_chindmsk; } AUXCHIND_CONFIG;

typedef struct { UINT8 aux_mode;

UINT8 aux_function;

UINT8 aux_inv;

UINT8 aux_tdon;

UINT8 aux_tdoff;

UINT8 aux_tauxf[2]; } AUX_CONFIG;

typedef struct { UINT8 aux_in;

UINT8 aux_out;

UINT8 aux_sync_in;

UINT8 aux_sync_out;

UINT8 aux_flag;

UINT8 aux_in_trig;

UINT8 aux_sync_trig;

UINT8 aux_random_trig; } AUX;

typedef struct { AUX_CONFIG port[2];

AUXCHIND_CONFIG auxchind_cfg;} AUXALL_CONFIG;

typedef struct { UINT8 antenna;

UINT8 num[CODE_MAX_LEN];} CODE;

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typedef struct { UINT8 Tslot;

UINT8 Ncodebloc;

UINT8 Ncodeslot;

UINT8 Ncalrefl;

UINT8 Ncoderef;

UINT8 Ncheckrefl;

UINT8 Nextrefl;

UINT8 Nmesrefl;

UINT8 Tcode00[2];

INT8 Tcal;

UINT8 Nnoisebin;

UINT8 Tmes0[2];

UINT8 Puseguard;

UINT8 Channel;

UINT8 Ant;

UINT8 Navg[2];

UINT8 Na;

UINT8 Nequ;

UINT8 Pposinst;

UINT8 Ninst;

UINT8 Pposfam;

UINT8 Nfam;

UINT8 Pposuser;

UINT8 Nuser;

UINT8 Ntab;

UINT8 Afagc;

UINT8 SNR;

UINT8 DSNRCal;

UINT8 DMultiTag;

UINT8 InitDelay1;

UINT8 InitDelay2;

UINT8 DelayRange1;

UINT8 DelayRange2; } CONFIG;

typedef struct { UINT8 message;

UINT8 data_msg;

UINT8 interface;

INT16 length;

BUFOBJ *buf; } DS_MSG;

typedef struct { BUFOBJ si_rx;

BUFOBJ si_tx;

BUFOBJ da_rx;

BUFOBJ da_tx; } DS_PTR;

typedef struct { UINT8 main;

UINT8 tx_untriggered;

UINT8 biased;

UINT8 sync;

UINT8 random;

UINT8 Tm;

UINT8 Nmess;

UINT8 Tdmin[2];

UINT8 Tdlen[2];

UINT8 Tsleep[2];

UINT8 analyz_id[CODE_MAX_LEN];

UINT8 biased_id[CODE_MAX_LEN];

UINT8 CwChannel;

UINT8 TxEnable; } MODE;

typedef struct { UINT8 Instal_code_len;

UINT8 Table_lookup_On;

UINT8 Family_code_len;

UINT8 Instal_code[CODE_MAX_LEN];

UINT8 Family_code[CODE_MAX_LEN];} PP_SETTINGS;

typedef struct { UINT8 flag;

INT16 array[SBUF_LEN];

UINT8 Afagc;

UINT8 antenna; } SBUF;

typedef struct { UINT8 SerSpeedDA;

UINT8 SerSpeedSI;

UINT8 MsgTypeID;

UINT8 TidF[2];

UINT8 ID_Msg_Retry;

UINT8 ID_Msg_Timeout; } SER_CONFIG;

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typedef struct { UINT8 Invalid;

UINT8 Num[CODE_MAX_LEN];

UINT8 AF_Agc;

UINT8 Noise_Level;

UINT8 Cal_Magnitude;

INT8 Cal_Shift;

UINT8 First_Tap_Pos;

UINT8 Delta_Last_Tap_Pos;

UINT8 Cur_Ant;

UINT8 Bloc[CODE_MAX_LEN1];

UINT8 Bloc_Magnitude[CODE_MAX_LEN];} TINFO;

typedef struct { TINFO tag[ID_FIFO_LEN];

CODE data[ID_FIFO_LEN];

INT16 in_idx;

INT16 out_idx; } TJD_FIFO;

typedef struct { TRIG_STATE state;

INT16 count[2];

RANDOM_STATE rnd;

INT16 meas_count; } TRIGGER;

4 Definition of message numbers

/*** definition of message numbers ***/

#define DOWNLOAD_REQ 0x10

#define MSG_ACK 0x11

#define RESET_REQ 0x12

#define TEST_SER_REQ 0x13

#define TEST_SER_REP 0x14

#define DOWNLOAD_REP 0x15

#define SET_CONFIG_REQ 0x20

#define SET_AUX_REQ 0x21

#define SET_MODE_REQ 0x22

#define SET_TRIGGER_REQ 0x23

#define SET_ANALYZ_ID_REQ 0x25

#define SET_BIASED_ID_REQ 0x26

#define SET_TEST_REQ 0x27

#define SET_CODEPP_REQ 0x28

#define SET_MONITOR_REQ 0x29

#define SET_AUX_CONFIG_REQ 0x2A

#define SET_AUX_TRIG_REQ 0x2B

#define SET_ADDR_REQ 0x2C // not handled by DSP SW

#define SET_SER_CONFIG_REQ 0x2D

#define CONFIG_REQ 0x30

#define AUX_REQ 0x31

#define MODE_REQ 0x32

#define DATA_REQ 0x33

#define TAG_ID_REQ 0x34 // response TAG_ID_IND

#define ANALYZ_RESULT_REQ 0x37

#define CODE_TABLE_REQ 0x38

#define ERROR_ARRAY_REQ 0x39

#define VERSION_REQ 0x3A

#define CODEPP_REQ 0x3B

#define IF_ERROR_REQ 0x3C

#define AUX_CONFIG_REQ 0x3D

#define SER_CONFIG_REQ 0x3E

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#define CONFIG_REP 0x40

#define AUX_REP 0x41

#define MODE_REP 0x42

#define TIME_DATA_REP 0x43

#define FREQ_DATA_REP 0x44

#define PARAM_DATA_REP 0x45

#define SAVE_DATA_REP 0x46

#define ANALYZ_RESULT_REP 0x47

#define CODE_TABLE_REP 0x48

#define ERROR_ARRAY_REP 0x49

#define VERSION_REP 0x4A

#define CODEPP_REP 0x4B

#define IF_ERROR_REP 0x4C

#define AUX_CONFIG_REP 0x4D

#define SER_CONFIG_REP 0x4E

#define TAG_ID_IND 0x50

#define RESET_IND 0x51

#define SYS_MSG_MASK 0x10

#define SET_MSG_MASK 0x20

#define REQ_MSG_MASK 0x30

#define REP_MSG_MASK 0x40

#define IND_MSG_MASK 0x50

#define MSG_GROUP_MASK 0xF0

#define FIRST_MSG DOWNLOAD_REQ

#define LAST_MSG RESET_IND

/*** download message definers ***/

#define DSP_SW 0

#define FPGA_SW 1

#define CODE_TABLE 2

5 Error numbers

/*** error array indices ***/

#define ERR_RESET_NR 0

#define ERR_SBUF 1

#define ERR_SI_RXFULL 2

#define ERR_SI_TXFULL 3

#define ERR_DA_RXFULL 4

#define ERR_DA_TXFULL 5

#define ERR_SI_NOT_RDY 6

#define ERR_DA_NOT_RDY 7

#define ERR_CLIPPING_ANT1 8

#define ERR_CLIPPING_ANT2 9

#define ERR_MSGD 10

#define ERR_FLASH_TMO 11

#define ERR_FLASH_DATA 12

#define ERR_MAX 13

/*** ERR_RESET_NR. ***/

#define XILINX_LOAD_ERROR 0xF1

#define XILINX_WRONG_CHANNEL 0xF2

Baumer Electric OIS-W-WR300303 RF-Identification System User Manual Interface

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