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Summary of Contents for Globalstar STX3
- Page 1 8545-0198-01 Revision 1.9 STX3 Users Manual STX3 Users Manual Globalstar Satellite Transmitter Module - Third Generation 9/24/2020 Globalstar, Inc. Confidential and Proprietary...
- Page 2 STX3 Users Manual Distribution Statements: GLOBALSTAR CONFIDENTIAL AND PROPRIETARY INFORMATION – All data and information contained in this document are confidential and proprietary to Globalstar, Inc. WARNING – This document may contain technical data whose export is restricted by the Export Administration Act of 1979, as amended, Title 50, U.S.C., App 2401 et seq.
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Page 3: Table Of Contents
Send Test Packet (0xFC 0x02) ............................ 20 5.2.2.11 Modulation Test Mode (0xFC 0x03) .......................... 21 Example CRC calculation routines for serial packets ......................22 AT commands ..................................24 Test Modes ...................................... 27 9/24/2020 | ii Globalstar, Inc. Confidential and Proprietary P a g e... - Page 4 8545-0198-01 Revision 1.9 STX3 Users Manual REGULATORY APPROVAL ................................28 Radio Astronomy Site Avoidance ............................28 Regulatory Notices ................................. 28 Appendix A – Antenna Manufacturers ............................31 9/24/2020 | iii Globalstar, Inc. Confidential and Proprietary P a g e...
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Page 5: Introduction
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. -
Page 6: 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. - Page 7 (redundant) transmissions for each message being sent over the Globalstar network. The default value for the number of redundant transmissions per message is 3. This means that each message sent to the STX3 will be transmitted 3 times.
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Page 8: Block Diagram
STX3. This provides the capability to leave the STX3 in a low power consumption state 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. -
Page 9: Physical Characteristics
8545-0198-01 Revision 1.9 STX3 Users Manual 3 Physical Characteristics Figure 5 Top View 9/24/2020 Globalstar, Inc. Confidential and Proprietary P a g e... - Page 10 8545-0198-01 Revision 1.9 STX3 Users Manual Figure 6 Recommended PCB footprint layout (dimensions in inches) 9/24/2020 Globalstar, Inc. Confidential and Proprietary P a g e...
- Page 11 Input Only drive with open collector, no external voltage to be applied VDIG Power In 3.0 to 5.0 Volts, 50 mA max load @ 3.3V, ripple 50 mV (pk-pk) max 9/24/2020 Globalstar, Inc. Confidential and Proprietary P a g e...
- Page 12 -30 to 85º C, Vcc = 3.3 volts 2.25 Standby mode supply current -30 to 85º C, Vcc = 3.3 volts µA Sleep mode supply current -30 to 85º C, Vcc = 3.3 volts µA 9/24/2020 Globalstar, Inc. Confidential and Proprietary P a g e...
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Page 13: Reference Design
4 Reference Design The following is a reference design which illustrates a typical implementation of a simplex transmitter device using the STX3 and a commercially available antenna. OEM designs are required to follow these guidelines with respect to the antenna configuration and layout. -
Page 14: Antenna Requirements
5.1dB in the spatial area between 25 degrees and 90 degrees elevation. The STX3 has Modular Certification from the FCC (USA) and Industry Canada (Canada) when used with an antenna that meets the specifications above. This means that, in general, no further FCC Part 25 testing or IC testing is required when using an approved antenna (recommended antennas are listed in Appendix A of this document) in accordance with the Globalstar-specified implementation requirements listed in this document. -
Page 15: Effect Of Plastic On Radiation
The power supply is sourced by a 3.0V - 5.0V input (VBATT). The digital supply (VDIG) is provided directly from the VBATT supply. VDIG provides the standby power for the STX3. In standby mode, the STX3 will respond to serial commands via the serial port. -
Page 16: Bill Of Materials
TMK212BBJ106KG-T TAIYOYUDEN GRM033R61A104ME15D MURATAELEC 0603ZD474KAT2A AVXCORP PA25-1615-025SA SPECTRUMCO BLM18HG471SN1D MURATAELEC L401 SRU5018-100Y BOURNS IRLML6401TRPBF INTERNATIONAL RECTIFIER ERJ-1GEJ105C PANASONIC RK73B1HTTC103J KOASPEEREL #N/A #N/A 2200-0333-01 (STX3) Globalstar U401 TPS63001DRCR TEXASINSTR 9/24/2020 | 12 Globalstar, Inc. Confidential and Proprietary P a g e... -
Page 17: Pcb Layout
4.5 PCB Layout The design has been laid out on a two-layer PCB consisting of a 60-mil core of FR-4 with ½ ounce copper clad. Figure 9 Component Side 9/24/2020 | 13 Globalstar, Inc. Confidential and Proprietary P a g e... - Page 18 8545-0198-01 Revision 1.9 STX3 Users Manual Figure 10 Antenna Side Figure 11 Top and Bottom Views 9/24/2020 | 14 Globalstar, Inc. Confidential and Proprietary P a g e...
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Page 19: Application Programming Interface
RTS before the first byte of the command and deactivating RTS after the last byte of the command. 5.2 Serial Packet Mode This mode is the legacy mode of operation as implemented in the STX2 which consists of binary data packets. 9/24/2020 | 15 Globalstar, Inc. Confidential and Proprietary P a g e... -
Page 20: Serial Packet Format
If an improperly formatted command is received, the STX3 will return a NAK response: AA 05 FF A1 CB 5.2.2.1 Send Data (0x00) The Send Data command requests the STX3 to send from 1 to 144 data bytes over the Globalstar Simplex network. 0x00 payload payload... -
Page 21: Query Electronic Serial Number (Esn) (0X01)
Response: AA 05 03 42 F6 5.2.2.4 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 CRC1... -
Page 22: Query Firmware Version (0X05)
AA 07 05 E0 6A Where the firmware version returned is: 5.2.2.6 Setup (0x06) The Setup command requests the STX3 to use the specified current setup parameters. These are stored in non-volatile memory. 0x06 Command: header len 04 RESERVED RF channel # of Bursts Interval Min Interval Max RESERVED CRC1 CRC2... -
Page 23: Query Setup (0X07)
• Maximum Burst Interval: 30 0x30 = 48, 48 x 5 = 240 seconds • 5.2.2.8 Query Hardware Version (0x09) The Query Hardware Version command requests the STX3 to return the current hardware version information. 0x09 header CRC1 CRC2 9/24/2020 | 19 Globalstar, Inc. -
Page 24: Cw Test Mode (0Xfc 0X01)
CW Test Mode (0xFC 0x01) The CW Test Mode command requests the STX3 to enter the CW test mode. This will cause the STX3 to output a CW signal for 30 seconds after which it will turn off the RF output and return to sleep mode. -
Page 25: Modulation Test Mode (0Xfc 0X03)
5.2.2.11 Modulation Test Mode (0xFC 0x03) The Modulation Test Mode command requests the STX3 to enter the Modulation test mode. This will cause the STX3 to output back-to-back test packets continuously for 30 seconds after which it will turn off the RF output and return to sleep mode. -
Page 26: Example Crc Calculation Routines For Serial Packets
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); 9/24/2020 | 22 Globalstar, Inc. Confidential and Proprietary P a g e... - Page 27 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); 9/24/2020 | 23 Globalstar, Inc. Confidential and Proprietary P a g e...
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Page 28: At Commands
Comments This command is used to check communication between the module and the host. STX3 is ready for normal operation ERROR STX3 is not ready for operation, an error condition exists AT+GSN? Request product serial number identification AT+CGSN? +GSN: <n-nnnnnnn>... - Page 29 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. 9/24/2020 | 25 Globalstar, Inc. Confidential and Proprietary P a g e...
- Page 30 +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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Page 31: Test Modes
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. - Page 32 Use of any antenna other than those listed in Appendix A will require proof of compliance (peak gain). The STX3 module has been labeled with its own FCC and Industry Canada (IC) ID numbers, and if the FCC/IC ID numbers are not...
- Page 33 • 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.
- Page 34 Member State as examined and the product is compliant with Article 10(10) as it has no restrictions on being put into service in all of the EU except Ireland. The STX3 cannot be marketed in Ireland. Anatel Certification stamp for operation in Brazil: Portuguese Produto não acabado, de uso interno, cuja...
- Page 35 Listed below are discrete antennas which are known to meet the antenna requirements of the modular grant when placed on an appropriate ground plane. The antenna manufacturers are not listed in any particular order. Globalstar does not make any recommendations with respect to antenna manufacturers and is providing this list as a convenience to integrators.
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