VECTRONIC Aerospace VERTEXPLUS Animal Location Collar User Manual STX3 Users Manual 1 1x

VECTRONIC Aerospace GmbH Animal Location Collar STX3 Users Manual 1 1x

Contents

Module manual

Revision 1.1 STX3 Users Manual
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STX3 Users Manual
Revision 1.1 STX3 Users Manual
01/06/2014
Revision 1.1 Subject To Change without Notice P a g e | 2
Table of Contents
1 Introduction .................................................................................................................................................................... 3
1.1 Purpose ................................................................................................................................................................... 4
1.2 Applicable Documents ............................................................................................................................................ 4
1.3 Description .............................................................................................................................................................. 4
2 Application ...................................................................................................................................................................... 5
2.1 Theory of Operation ................................................................................................................................................ 5
2.2 Block Diagram ......................................................................................................................................................... 7
3 Physical Charactersistics ................................................................................................................................................. 9
4 Application Programming Interface .............................................................................................................................. 12
4.1 Serial Port .............................................................................................................................................................. 12
4.2 Serial Packet Mode ............................................................................................................................................... 13
4.2.1 Serial Packet Format ..................................................................................................................................... 13
4.2.2 Serial Packet Commands ............................................................................................................................... 14
4.2.2.1 Send Data (0x00) ....................................................................................................................................... 14
4.2.2.2 Query Electronic Serial Number (ESN) (0x01) ........................................................................................... 14
4.2.2.3 Abort Transmission (0x03) ........................................................................................................................ 15
4.2.2.4 Query Bursts Remaining (0x04) ................................................................................................................ 15
4.2.2.5 Query Firmware Version (0x05) ................................................................................................................ 15
4.2.2.6 Setup (0x06) .............................................................................................................................................. 16
4.2.2.7 Query Setup (0x07) ................................................................................................................................... 16
4.2.2.8 Query Hardware Version (0x09) ............................................................................................................... 17
4.3 Example CRC calculation routines for serial packets ............................................................................................ 19
4.4 AT commands ........................................................................................................................................................ 21
5 Test Modes .................................................................................................................................................................... 24
6 REGULATORY APPROVAL .............................................................................................................................................. 26
6.1 Radio Astronomy Site Avoidance .......................................................................................................................... 26
6.2 Regulatory Notices ................................................................................................................................................ 26
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Revisions
1.0 11/05/2013 Initial Release
1.1 01/06/2014 Corrected VRF voltage range
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1 Introduction
1.1 Purpose
This document describes the physical, electrical, and functional characteristics of the STX3 satellite transmitter
module. The information contained in this document is intended to provide the end user with the necessary
technical information required to use the module in a custom application.
This document is intended to be used by engineers and technical management and assumes a general knowledge of
basic engineering practices by the user.
1.2 Applicable Documents
1.3 Description
The STX 3 is a simplex Satellite transmitter designed to send small packets of user defined data to a network of low
earth orbiting (LEO) satellites using the Globalstar simplex satellite network. The received data is then forwarded to
a user defined network interface that may be in the form of an FTP host or HTTP host where the user will interpret
the data for further processing.
The STX3 is a surface mount module designed to attach to a user defined host PCB which must provide power, an
RF connection to the transmit antenna, and communications with a host processor which will control the operation
of the STX3. All electrical connections are provided via the castellated pads on the perimeter of the PCB.
The STX3 is a small, low-profile device with the dimensions shown below.
Figure 1 (dimensions in inches)
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2 Application
2.1 Theory of Operation
The STX3 operates on the Globalstar LEO satellite network. LEO (Low Earth Orbit) means that there are a number of
satellites in
low earth orbit that constantly orbit the planet and can communicate with Globalstar devices that are within
range of its current position.
Since the satellite position is constantly changing, simplex devices on the ground will transmit (with no knowledge of
any of the satellites locations) and
the transmission
relay the message to the nearest satellite
gateway as shown below. Once received by the
message will be delivered to the
simplex gateway where redundant messages are discarded and the data from the
message is sent to the OEM via the In
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The STX3 operates on the Globalstar LEO satellite network. LEO (Low Earth Orbit) means that there are a number of
low earth orbit that constantly orbit the planet and can communicate with Globalstar devices that are within
Figure 2 LEO Constellation
Since the satellite position is constantly changing, simplex devices on the ground will transmit (with no knowledge of
the transmission
may be received by one or more satellites. These satellites will then
gateway as shown below. Once received by the
satellite
simplex gateway where redundant messages are discarded and the data from the
ternet.
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The STX3 operates on the Globalstar LEO satellite network. LEO (Low Earth Orbit) means that there are a number of
low earth orbit that constantly orbit the planet and can communicate with Globalstar devices that are within
Since the satellite position is constantly changing, simplex devices on the ground will transmit (with no knowledge of
may be received by one or more satellites. These satellites will then
satellite
gateway, the simplex
simplex gateway where redundant messages are discarded and the data from the
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Messages are composed of 1 or more 9-
byte payloads. The STX3 can only transmit 9
payloads greater than 9 bytes will require multiple on
There are brief periods of time where there is no satellite in range of the simplex transmitters due to obstructions
and/or
satellite coverage geometry. Since a simplex device has no way of knowing if
successfully received, the STX3 device is designed to send
sent over the Globalstar network. The default value for the number of redundant
means that each message sent to the STX3 will be transmitted 3 times. Each transmission will contain the exact same
data payload.
The redundant transmissions
The transmission sequence for a single-
packet message using the default setting of 3 redundant transmissions is shown
below.
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Figure 3 Simplex Messaging
byte payloads. The STX3 can only transmit 9
-byte on-
air messages, so user
payloads greater than 9 bytes will require multiple on
-air packets to be transmitt
ed for each user payload.
There are brief periods of time where there is no satellite in range of the simplex transmitters due to obstructions
satellite coverage geometry. Since a simplex device has no way of knowing if
a transmitted message has been
successfully received, the STX3 device is designed to send
multiple (redundant) transmissions
for each message being
sent over the Globalstar network. The default value for the number of redundant
transmissions
means that each message sent to the STX3 will be transmitted 3 times. Each transmission will contain the exact same
The redundant transmissions
of each message will be sent on a randomized 5-
minute
packet message using the default setting of 3 redundant transmissions is shown
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air messages, so user
ed for each user payload.
There are brief periods of time where there is no satellite in range of the simplex transmitters due to obstructions
a transmitted message has been
for each message being
transmissions
per message is 3. This
means that each message sent to the STX3 will be transmitted 3 times. Each transmission will contain the exact same
minute
nominal interval.
packet message using the default setting of 3 redundant transmissions is shown
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The transmission sequence for a two-
packet message using the default setting of 3 redundant transmissions is shown
below.
For normal conditions where the transmitter has an open view of the sky, this will result in a better than 99% chance
that the message will be received.
2.2 Block Diagram
The basic elements of a design utilizing the STX3 simplex transmitter are shown below.
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packet message using the default setting of 3 redundant transmissions is shown
For normal conditions where the transmitter has an open view of the sky, this will result in a better than 99% chance
The basic elements of a design utilizing the STX3 simplex transmitter are shown below.
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packet message using the default setting of 3 redundant transmissions is shown
For normal conditions where the transmitter has an open view of the sky, this will result in a better than 99% chance
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The STX3 provides separate power supply inputs. The digital power supply input (VDIG) is a low power input which
powers the digital portion of the STX3. This provides the capability to leave the STX3 in a low power cons
when the transmitter RF section is idle. The RF power supply input is a high power input which is only required while the
STX3 is transmitting a data packet.
Since the transmission duty cycle is very low, this supply may be turned off the
m
ajority of the time and only active during the transmission of a packet. Due to the random nature of the burst
transmissions, and open collector output (PWR_EN) is provided by the STX3 which can directly control the high current
supply for VRF. This will
ensure that the RF power supply is enabled for the
transmission. It may also be monitored by the host to determine when each burst has been completed without the
need to query the STX3 via the serial host interface
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Figure 4
The STX3 provides separate power supply inputs. The digital power supply input (VDIG) is a low power input which
powers the digital portion of the STX3. This provides the capability to leave the STX3 in a low power cons
when the transmitter RF section is idle. The RF power supply input is a high power input which is only required while the
Since the transmission duty cycle is very low, this supply may be turned off the
ajority of the time and only active during the transmission of a packet. Due to the random nature of the burst
transmissions, and open collector output (PWR_EN) is provided by the STX3 which can directly control the high current
ensure that the RF power supply is enabled for the
minimum
amount of time to complete each
transmission. It may also be monitored by the host to determine when each burst has been completed without the
need to query the STX3 via the serial host interface
.
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The STX3 provides separate power supply inputs. The digital power supply input (VDIG) is a low power input which
powers the digital portion of the STX3. This provides the capability to leave the STX3 in a low power cons
umption state
when the transmitter RF section is idle. The RF power supply input is a high power input which is only required while the
Since the transmission duty cycle is very low, this supply may be turned off the
ajority of the time and only active during the transmission of a packet. Due to the random nature of the burst
transmissions, and open collector output (PWR_EN) is provided by the STX3 which can directly control the high current
amount of time to complete each
transmission. It may also be monitored by the host to determine when each burst has been completed without the
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3 Physical Charactersistics
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Figure 5 Top View
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Figure 6
Recommended PCB footprint layout (dimensions in inches)
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Recommended PCB footprint layout (dimensions in inches)
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PIN
NAME
TYPE
Description
1
CTS
Output
5V tolerant, weak internal pull
-
up, may be
pulled up to 5V max external
2
RTS
Input
5V tolerant, weak internal pull
-
up
3
RESERVED
No Connect
Do NOT connect
4
NC
No Connect
5
NC
No Connect
6
RESERVED
No Connect
Do NOT connect
7
VRF
Power In
3
.0 to
3.6
Volts
, 500 mA max load @ 3.3V
8
GND
Ground
9
GND
Ground
10
GND
Ground
11
GND
Ground
12
GND
Ground
13
GND
Ground
14
RFOUT
Output
50 ohm single ended antenna connection, use impedance matched trace
15
GND
Ground
16
GND
Ground
17
GND
Ground
18
GND
Ground
19
GND
Ground
20
GND
Ground
21
RESERVED
No Connect
22
RESERVED
No Connect
23
RESERVED
No Connect
24
PWR_EN
Output
Open collector output to control VRF supply
25
NC
No Connect
26
TxD
Output
5V tolerant, weak internal pull
-
up, may be pulled up to 5V max external
27
RxD
Input
5V tolerant, weak internal pull
-
up
28
Test2
Input
5V tolerant, weak internal pull
-
up
29
Test1
Input
5V tolerant, weak internal pull
-
up
30
RESERVED
No Connect
Do NOT connect
31
RESET
Input
Only drive with open collector, no external voltage
to be applied
32
VDIG
Power In
3.0 to 5.0 Volts
, 50 mA max load @ 3.3V
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Parameter
TX output power
-
40
Transmit mode supply current
-
40
Active mode supply current
Standby mode supply current
Sleep mode supply current
4
Application Programming Interface
4.1 Serial Port
A half-duplex (0-
3.0V) TTL asynchronous serial port (UART) is the primary interface to the user equipment. The serial
port operates with the serial parameters of 9600bps, 8 data bits, no parity, 1 stop bit.
The RX data input and the RTS
inputs are 5V tolerant. The TX data and CTS outputs are 0
RS232 input levels are not supported. RS232 data must be converted to TTL before being sent to the unit.
Each command from the DTE to the modem (STX) is sent in a serial packet. Upon
answers to the DTE and, if applicable, executes the command.
In order to wake up the modem (STX) from sleep mode and to indicate the end of the serial packet, each serial packet
must be framed by activating RTS before the f
command.
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Test Conditions
Min
40
-
85º C, Vcc=Vrf=3.3 volts, 50 ohm load
17.0
40
-
85º C, Vcc=Vrf=3.3
volts, 50 ohm load
315
25º C, Vcc = 3.3 volts
25º C, Vcc = 3.3 volts
25º C, Vcc = 3.3 volts
Application Programming Interface
3.0V) TTL asynchronous serial port (UART) is the primary interface to the user equipment. The serial
port operates with the serial parameters of 9600bps, 8 data bits, no parity, 1 stop bit.
inputs are 5V tolerant. The TX data and CTS outputs are 0
-
3.0V TTL.
RS232 input levels are not supported. RS232 data must be converted to TTL before being sent to the unit.
Each command from the DTE to the modem (STX) is sent in a serial packet. Upon
receiving the command, the modem
answers to the DTE and, if applicable, executes the command.
In order to wake up the modem (STX) from sleep mode and to indicate the end of the serial packet, each serial packet
must be framed by activating RTS before the f
irst byte of the command and deactivating RTS after the last byte of the
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Typ
Max
Unit
17.5
18.0
dB
325
350
mA
2.3
2.5
mA
12
50
uA
8
40
uA
3.0V) TTL asynchronous serial port (UART) is the primary interface to the user equipment. The serial
3.0V TTL.
RS232 input levels are not supported. RS232 data must be converted to TTL before being sent to the unit.
receiving the command, the modem
In order to wake up the modem (STX) from sleep mode and to indicate the end of the serial packet, each serial packet
irst byte of the command and deactivating RTS after the last byte of the
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4.2 Serial Packet Mode
This mode is the legacy mode of operation as implemented in the STX2 which consists of binary data packets.
4.2.1 Serial Packet Format
Preamble Fixed patt
ern 0xAA
Length
Total number of bytes in the serial packet including the preamble
Command
Command type (See Table 5 Serial Packet Type). Responses to
commands carry the same command type as the command that
initiated the answer
Data
Data associated with the command or answer
CRC
16 bit CRC
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This mode is the legacy mode of operation as implemented in the STX2 which consists of binary data packets.
ern 0xAA
Total number of bytes in the serial packet including the preamble
Command type (See Table 5 Serial Packet Type). Responses to
commands carry the same command type as the command that
initiated the answer
Data associated with the command or answer
16 bit CRC
Figure 7 Serial Packet Format
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This mode is the legacy mode of operation as implemented in the STX2 which consists of binary data packets.
Total number of bytes in the serial packet including the preamble
Command type (See Table 5 Serial Packet Type). Responses to
commands carry the same command type as the command that
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4.2.2 Serial Packet Commands
For all serial packet commands as described below:
• AA is the Preamble.
• NN is the Length.
• XX is an unspecified byte value
• CLSB is the least significant CRC byte
• CMSB is the most significant CRC byte
• If an improperly formatted command is received, the STX3 will return a NAK response:
AA 05 FF A1 CB
4.2.2.1 Send Data (0x00)
The Send Data command requests the STX3 to send from 1 to 144 data bytes over the Globalstar Simplex network.
0x00
header len cmd
payload
1
payload
2
payload
3 ..
payload
N CRC1 CRC2
AA NN 00
XX XX XX XX XX
CLSB CMSB
Example Command: AA 0E 00 01 02 03 04 05 06 07 08 09 BE E8
Response: AA 05 00 D9 C4
The example above commands the STX3 to send 9 bytes of user defined data over the Globalstar Simplex network. If
the STX3 receives a properly formatted Send Data command, it returns an acknowledge response as shown above. If the
command is not properly formatted, it will return the NAK response AA 05 FF A1 CB.
4.2.2.2 Query Electronic Serial Number (ESN) (0x01)
The Electronic Serial Number command requests the STX3 to respond with the units Electronic Serial Number (ESN).
0x01
header len Cmd CRC1 CRC2
AA 05 01 50 D5
Command: AA 05 01 50 D5
Response:
header len Cmd ESN CRC1 CRC2
AA 09 01 XX XX XX XX
86 7A
Example Response: AA 09 01 00 23 18 60 86 7A
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Where the ESN returned is 2300000.
4.2.2.3 Abort Transmission (0x03)
The Abort Transmission command requests the STX3 to abort the current message transmit sequence over the
Globalstar Simplex network.
0x03
header len Cmd CRC1 CRC2
AA 05 03 42 F6
Command: AA 05 03 42 F6
Response: AA 05 03 42 F6
4.2.2.4 Query Bursts Remaining (0x04)
The Query Bursts Remaining command requests the STX3 to return the current number of bursts remaining the current
message transmit sequence over the Globalstar Simplex network.
0x04
header len cmd CRC1 CRC2
AA 05 04 FD 82
Command: AA 06 04 00 F4 33
Response:
Header Len 04 count CRC1 CRC2
AA 05 04 XX CC CC
Example Response: AA 06 04 00 F4 33
Where the bursts remaining returned is: 0
4.2.2.5 Query Firmware Version (0x05)
The Query Firmware Version command requests the STX3 to return the current firmware version.
0x05
header Len cmd CRC1 CRC2
AA 05 05 74 93
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Command: AA 05 05 74 93
Response:
header Len 04 FW major FW minor CRC1
CRC2
AA 08 05 XX XX XX CC CC
Example Response: AA 08 05 01 00 07 57 44
Where the firmware version returned is: 1.07
4.2.2.6 Setup (0x06)
The Setup command requests the STX3 to use the specified current setup parameters. These are stored in non-volatile
memory.
0x06
Command:
Where:
• RF channel : Valid values are: 0 = Channel A, 1 = Channel B, 2 = Channel C, 3 = Channel D
• # of bursts: Valid values are: 0x01 thru x14 (1 to 20 bursts)
• Minimum Burst Interval: Units of 5 seconds. Valid values are: 0x01 thru 0x3C (5 to 300 seconds)
• Maximum Burst Interval: Units of 5 seconds. Valid values are: 0x02 thru 0x78 (10 to 600 seconds)
Example Command: AA 0E 06 00 00 00 00 00 03 18 30 00 CE 9C
Where the setup information is:
• RF channel : 00 Channel A
• # of bursts: 03 3 bursts per message
• Minimum Burst Interval: 18 0x18 = 24, 24 x 5 = 120 seconds
• Maximum Burst Interval: 30 0x30 = 48, 48 x 5 = 240 seconds
4.2.2.7 Query Setup (0x07)
The Query Setup command requests the STX3 to return the current setup parameters.
header len 04 RF channel # of Bursts Interval Min Interval Max RESERVED CRC1 CRC2
AA 0E 06 XX XX XX XX XX XX XX XX XX CC CC
RESERVED
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0x07
header len cmd CRC1 CRC2
AA 05 07 66 B0
Command: AA 05 07 66 B0
Response:
Where:
• RF channel : Valid values are: 0 = Channel A, 1 = Channel B, 2 = Channel C, 3 = Channel D
• # of bursts: Valid values are: 0x01 thru x14 (1 to 20 bursts)
• Minimum Burst Interval: Units of 5 seconds. Valid values are: 0x01 thru 0x3C (5 to 300 seconds)
• Maximum Burst Interval: Units of 5 seconds. Valid values are: 0x02 thru 0x78 (10 to 600 seconds)
Example Response: AA 0E 07 00 23 18 60 00 03 18 30 00 5D 60
Where the setup information returned is:
• RF channel : 00 Channel A
• # of bursts: 03 3 bursts per message
• Minimum Burst Interval: 18 0x18 = 24, 24 x 5 = 120 seconds
• Maximum Burst Interval: 30 0x30 = 48, 48 x 5 = 240 seconds
4.2.2.8 Query Hardware Version (0x09)
The Query Hardware Version command requests the STX3 to return the current hardware version information.
0x09
header len Cmd CRC1 CRC2
AA 05 09 18 59
Command: AA 05 09 18 59
Response:
header
len
04
Device Code Board Rev CPU Rev Radio Rev CRC1
CRC2
AA 0A 09
00
01
XX XX XX CC CC
header len 04 RF channel # of Bursts Interval Min Interval Max RESERVED CRC1 CRC2
AA 0E 07 XX XX XX XX XX XX XX XX XX CC CC
RESERVED
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Where:
• Device Code : Always 1 for STX3
• Board Revision: STX3 hardware revision
• CPU Revision: STX3 CPU revision
• Radio Revision: STX3 radio revision
Example Response: AA 0A 09 00 01 00 8E 62 E5 5E
Where the revision information returned is:
• Board Revision: 00
• CPU Revision: 8E
• Radio Revision: 62
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4.3 Example CRC calculation routines for serial packets
The following example is written in the C programming language where:
int = 32 bits, short = 16 bits, char = 8 bits
unsigned short crc16_lsb(unsigned char *pData, int length)
{
unsigned char i;
unsigned short data, crc;
crc = 0xFFFF;
if (length == 0)
return 0;
do
{
data = (unsigned int)0x00FF & *pData++;
crc = crc ^ data;
for (i = 8; i > 0; i--)
{
if (crc & 0x0001)
crc = (crc >> 1) ^ 0x8408;
else
crc >>= 1;
}
}while (--length);
crc = ~crc;
return (crc);
}
USAGE: calculate the CRC for a message and update the message CRC
unsigned short crc = crc16_lsb(msg, msg [1]-2);
msg [msg [1]-2] = (unsigned char) (crc&0xFF);
msg [msg [1]-1] = (unsigned char) (crc>>8);
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The following example is written in the Java programming language:
char crc16_lsb(byte pData[], int length)
{
int pData_i = 0;
char s1,s2;
byte i;
char data, crc;
crc = (char) 0xFFFF;
if (length == 0)
return 0;
do
{
data = (char)((char)0x00FF & pData[pData_i++]);
crc = (char)(crc ^ data);
for (i = 8; i > 0; i--)
{
if ((crc & 0x0001) != 0)
crc = (char)((crc >> 1) ^ 0x8408);
else
crc >>= 1;
}
}while (--length != 0);
crc = (char)~crc;
return (crc);
}
USAGE: calculate the CRC for a message and update the message CRC
byte msg[]; int len;
char crc = crc16_lsb(msg,len-2);
msg[len-2] = (byte)((short)crc & (short)0xff);
msg[len-1] = (byte)((short)crc >> 8);
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4.4 AT commands
Command Response Comments
AT This command is used to check communication between the
module and the host.
OK STX3 is ready for normal operation
ERROR STX3 is not ready for operation, an error condition exists
AT+GSN?
AT+CGSN?
Request product serial number identification
+GSN: <n-nnnnnnn> product serial number identification (ESN)
ERROR Unable to retrieve ESN
AT+GMM?
AT+CGMM?
+GMM: STX3 Request model identification (hardware version).
AT+GMI?
AT+CGMI?
+GMI: GLOBALSTAR Request manufacturer identification
AT+GMR?
AT+CGMR?
Request revision identification (firmware version).
+GMR: <MM.mm> MM=Major Revision, mm=Minor Revision
Example: +GMR: 01.00
ERROR Unable to retrieve revision identification
AT+CMGS=<hhhh..hh>
Send message up to 144 data bytes specified by hexadecimal
string
Example: AT+CMGS=AA5511A53311A53311
OK Message Burst In Progress
ERROR Invalid message or modem error
AT+CMGSL=<Lat,NS,
Lng, EW,hhhhhh>
Send location message with 3 data bytes specified by
hexadecimal string.
Lat: ddmm.mmmm
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dd: decimal degrees, mm.mmmm minutes
NS: hemisphere (N/S)
Lng: dddmm.mmmm
ddd: decimal degrees, mm.mmmm minutes
EW: hemisphere (E/W)
hhhhhh: hexadecimal value of 3 byte payload
Example:
AT+CMGSL=3025.9857,N,09005.2182,W,A53311
OK Message Burst In Progress
ERROR Invalid message or modem error
AT+CANX Cancel running transmission.
OK Command OK (This command will never return an error. If no
transmission is running, it will simply do nothing. This makes it
possible for user code to just blindly send this command before
any command to transmit if desired.)
AT+CGNTR? Request the remaining number of total packet transmissions
remaining in a running burst. The value returned by this query
will represent the number of packets in the message times the
number of burst transmissions remaining. For example, if two
transmissions remain in the burst of a 4 packet message, a value
of 8 will be returned. If no burst is in progress, a value of 0 will
be returned. This command will never return an error.
+CGNTR: <n> n= Number of packets left in the burst
Example: +CGNTR: 8
AT+CDFC=<channel
number>
Set the default channel. Valid values are 0 – 3.
Example: AT+CDFC=2
OK Command OK, channel was successfully set.
ERROR ERROR. Typically means channel number is out of range.
AT+CFDC? Request current channel.
+CDFC: <n> N= current channel, a number between 0 and 3.
AT+CBNT=<Number of
tries>
Set number of transmissions in burst. <Number of tries> = the
number of transmissions in the burst. Range must be 1 – 16.
Value may be sent in decimal or HEX format. HEX is indicated
with a leading “0x”.
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OK Command OK, number of tries successfully set.
ERROR Unable to set number of tries. Most likely reason is that the
number requested was out of range. Must be 1 – 16.
AT+CBNT? Request number of tries setting for bursts.
+CBNT: <n> <n>= number of tries set for bursts.
AT+CBTMIN=<seconds>
Set the minimum time between transmissions in the burst in
seconds. Acceptable range is 5 – 300 seconds. Value will be
truncated by the device to the nearest divisible of 5. For
example, if the number 207 is sent, the device will set the
minimum to 205 seconds. Number may be sent in decimal or
HEX format. HEX is indicated by a leading “0x”.
OK Command accepted and time set.
ERROR Time not set, most likely reason is the number was out of range.
AT+CBTMIN? Query the minimum time between transmissions in the burst.
+CBTMIN: <n> Minimum time between transmissions in a burst, in seconds.
AT+CBTMAX=<seconds>
Set the maximum time between transmissions in the burst in
seconds. Acceptable range is <CBTMIN> – 600 seconds. Value
will be truncated by the device to the nearest divisible of 5. For
example, if the number 532 is sent, the device will set the
minimum to 530 seconds. Number may be sent in decimal or
HEX format. HEX is indicated by a leading “0x”.
OK Command accepted and time set.
ERROR Time not set, most likely reason is the number was out of range.
AT+CBTMAX? Query the maximum time between transmissions in the burst.
+CBTMAX: <n> Maximum time between transmissions in a burst, in seconds.
AT+BDREV? Query the board revision of the STX3
+BDREV: <n> Board revision. TBD if this will even be implemented for the
STX3, if unimplemented, will always return 0.
AT+PRREV? Query the processor (CPU) revision of the Globalstar ASIC.
+PRREV: <n> Processor revision.
AT+RAREV? Query the “radio” revision (revision of the transmitter side of
the Globalstar ASIC).
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+RAREV: <n> Transmitter revision.
5 Test Modes
The STX3 provides several test modes intended to aid in manufacturing testing and certification testing.
All test modes are activated by grounding selective pins on the STX3 prior to applying power. Once power is applied, the
STX3 will sample the states of the pins and based on the states of the pins, the STX3 will enter the selected test mode.
For normal operation these pins must be left floating or in a high (logic 1) state.
The following tables define the different test modes available in the STX3.
TEST1
TEST2
Mode
0
0
Mod Mode
(continuous transmission)
-
A test packet is continuous
ly
transmitted. The test packet shall comply with the Air Interface
Packet format with a user information equal to the hex stream
0x80AAF0F0F0AAF0F0F0 where the most significant bit is
transmitted first
0
1
Test Packet
-
The test packet shall comply with the Air Interface
Packet format with a user information equal to the hex stream
0x80AAF0F0F0AAF0F0F0 where the most significant bit is
transmitted first
1
0
CW mode
-
An un
-
modulated carrier is
continuously
transmitted
.
1
1
Normal Operation
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The channels are selected via the Rx and RTS pins as follows
RX
RTS
Channel
0
0
B
0
1
C
1
0
D
1
1
Channel specified in the flash setup
. To specify channel A, it must
be the default channel specified in the flash setup. See Setup
command for details.
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6 REGULATORY APPROVAL
The STX3 module has received regulatory approvals for modular devices in the United States and Canada. Modular
device approval allows the end user to place the STX3 module inside a finished product and not require regulatory
testing for an intentional radiator (RF transmitter), provided no changes or modifications are made to the module
circuitry. Changes or modifications could void the user’s authority to operate the equipment. The end user must comply
with all of the instructions provided by the Grantee, which indicate installation and/or operating conditions necessary
for compliance. The integrator is still responsible for testing the end product for any additional compliance requirements
required with this module installed (digital device emission, PC peripheral requirements, etc.) in the specific country that
the end device will be marketed. For more information on regulatory compliance, refer to the specific country radio
regulations in the following sections.
6.1 Radio Astronomy Site Avoidance
The end user device must comply with the requirements for Radio Astronomy Site avoidance as specified by the
Globalstar National Science Foundation agreement of 2001. It must be compliant with CFR25.213.
6.2 Regulatory Notices
The STX3 has received Federal Communications Commission authorization under FCC Rules Part 25 as a modular
transmitter. Final installation must be in compliance with 25.213 (see 6.1 above). The antenna installation and
operating configurations of this transmitter must satisfy MPE categorical Exclusion Requirements of 2.1091. The
antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons
and must not be collocated or operating in conjunction with any other antenna or transmitter.
The STX3 module will satisfy FCC/IC modular transmitter requirements only when used with the antenna specified
below. No power amplifiers may be used under the terms of this modular approval. No trace antennas are approved
for use under the terms of this modular approval.
Manufacturer
Part Number
Polarization
Center Frequency
(MHz)
Peak Gain
(dB)
Spectrum PA25-1615-025SA
LHCP 1615 .25 3.0
The STX3 module has been labeled with its own FCC ID number, and if the FCC ID is not visible when the module is
installed inside another device, then the outside of the finished product into which the module is installed must also
display a label referring to the enclosed module:
Contains Transmitter Module FCC ID: L2V-STX3
This device complies with Part 15 of the FCC
Rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any
interference received, including interference that
may cause undesired operation.
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The user’s manual should include the following statements:
This equipment has been tested and found to comply with the limits
for a Class B digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy, and if not
installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the
equipment OFF and ON, the user is encouraged to try to correct
the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from
that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
WARNING: Changes or modifications not expressly approved by
Globalstar may render the device non-compliant to FCC and other
regulatory body standards for operation and may void the user’s
authority to operate the equipment.
This device complies with Part 15 of the FCC Rules. Operation is
subject to the following two conditions: (1) This device may not
cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause
undesired operation.
This ClassA/ClassB digital apparatus complies with Canadian
ICES-003.
This device will operate in accordance to the standards set forth by
the CE Mark Directives and standards R&TTE: (TBR41 v1.1.1 May
2000, EN 301 441), RFI: (EN61000-4-3:1996 + A1:1998 +
A2:2000), ESD: (EN61000-4-2: 1995 + A1:1998)
NOTICE: This equipment complies with the FCC RF Exposure
Limits. A minimum of 20 centimeters (8 inches) separation between
the device and the user and all other persons should be
maintained.
FCC ID: L2V-STX3
ICES-003/(A/B)
IC:3989A-STX3
R&TTE: TBR41
Complies with FCC standards.
FOR HOME OR OFFICE USE

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