Trimble TRM 900 Designed Limited Single-Modular Transceiver User Guide
- June 6, 2024
- Trimble
Table of Contents
- Trimble TRM 900 Designed Limited Single-Modular Transceiver
- Contact Information
- Safety Information
- Introduction
- Getting Started
- Interface Port Pin Out
- Protocols and Modes of Operation
- Electrical Considerations
- Mechanical Considerations
- Appendix A – Cables and Connectors
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
Trimble TRM 900 Designed Limited Single-Modular Transceiver
AMERICAS & ASIA-PACIFIC
Trimble Navigation Ltd.
Integrated Technologies
510 DeGuigne Drive
Sunnyvale, CA 94085
USA
+1-408-481-8070 Phone
+1-408-481-8984 Fax
EUROPE & MIDDLE EAST
Trimble Navigation Ltd.
Integrated Technologies
HAL Trade Center
Bevelandseweg 150
1703 AX Heerhugowaard
Netherlands
+31-725-724-408 Phone
+31-725-348-288 Fax
RUSSIA
Trimble Navigation Ltd.
Integrated Technologies
Tel: +7 495 5041081
Email: [email protected]
CHINA
Trimble Navigation Ltd.
Integrated Technologies
311 Fute (M) Road, 3/F
Wai Gaoqiao Free Trade Zone
Pudong, Shanghai 200131
China
Email: [email protected]
Contact Information
Trimble Navigation Limited
Integrated Technologies
510 DeGuigne Drive
Sunnyvale, CA 94085
USA
1-408-481-8070 Phone
1-800-795-1001 (USA toll free)
1-408-481-8982 Fax
www.trimble.com
Support hours are 8 am to 5 pm Pacific Time. Please visit our website for up- to-date news and product announcements. Firmware and software upgrades are available from our website, usually free of charge.
Notices
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.
FCC Certified Modular Transceiver The TRM900 (902.0 MHz to 928.0 MHz) Limited Singular Modular Transceiver is only approved for use by Trimble in its own GNSS Receiver products and not intended for sale to third parties. This module is not intended for OEM integrators or end users. As a Limited Single Module, additional compliance evaluation is required for use in each of the GNSS Receiver host. The antenna listed below is allowed to be used with this transmitter module:
• Monopole antenna with peak gain of 2.1 dBi.
• The connector type is MMCX.
Changes or modifications made to this equipment not expressly approved by Trimble may void the FCC authorization to operate this equipment.
Canada
Antenna Statement
Under Industry Canada regulations, this radio transmitter may only operate
using an antenna of a type and maximum (or lesser) gain approved for the
transmitter by Industry Canada. To reduce potential radio interference to
other users, the antenna type and its gain should be so chosen that the
equivalent isotropically radiated power (e.i.r.p.) is not more than that
necessary for successful communication.
Licence exempt
This device complies with Industry Canada licence-exempt RSS standard(s).
Operation is subject to the following two conditions:
(1) this device may not cause interference, and
(2) this device must accept any interference, including interference that may
cause undesired operation of the device.
Safety Information
Before you use your radio, ensure that you have read and understood this
publication, as well as safety requirements.
CAUTION – A license is required before operating radio communication
equipment.
Warnings and cautions
- An absence of specific alerts does not mean that there are no safety risks involved.
- Always follow the instructions that accompany a Warning or Caution. The information they provide is intended to minimize the risk of personal injury and/or damage to the equipment. In particular, observe safety instructions that are presented in the following formats:
- WARNING – Alerts you to a likely risk of serious injury to your person and/or damage to the equipment. A warning identifies the nature of the risk and the extent of possible injury and/or damage. It also describes how to protect yourself and/or the equipment from this risk. Warnings that appear in the text are repeated at the front of the manual.
- CAUTION – A Caution alerts you to a possible risk of damage to the equipment and/or loss of data. A Caution describes how to protect the equipment and/or data from this
Exposure to radio frequency energy
The radio is designed to comply with the following national and international standards and guidelines regarding exposure of human beings to radio frequency electromagnetic energy, in addition to protection against harmful interference of neighboring electrical equipment:
- FCC Report and Order FCC 96-326 (August, 1996)
- American National Standards Institute (C95.3-1992)
- National Council on Radiation Protection and Measurement (NCRP – 1986)
- International Commission on Non-ionizing Radiation Protection (ICNRP – 1986)
- European Committee for Electrotechnical Standardization (CENELEC)
- 47 CFR FCC Part 15, Subpart C (Section 15.247)
- RSS-247 Issue2, February 2017
Contact your sales representative for model specific country approval.
To assure optimal radio performance and to ensure that exposure to RF energy
is within the guidelines in the above standards, observe the following
operating procedures:
- Do not operate a transceiver when someone is within the distance noted below of the antenna (unity gain).
- 20 cm (approximately 7.9 in) for the TRM 900 radio @ 1W
- Do not operate the transceiver unless all RF connectors are secure and any open connectors are properly terminated.
- Avoid contact with the antenna while operating the transceiver.
- Do not operate the transceiver with a damaged antenna. If a damaged antenna comes in contact with the skin, a minor burn may result.
- Do not operate the equipment near electrical blasting caps or in an explosive atmosphere.
CAUTION – Changes or modifications not expressly approved by the FCC could void the user’s authority to operate the equipment.
Introduction
This guide provides information concerning the integration of the TRM 900 radio modem transceiver into your product (Model Number: TRM900 MHZ TX/RX). This guide should be used in conjunction with the GNSS Receiver User’s Guide – Dealer Version that should be referenced for general information concerning the configuration of TRM 900 modems, and also for detailed programming information.
The TRM 900 is a general-purpose radio modem transceiver that is compatible with other Trimble radio modems. The TRM 900 transceiver is designed specifically for integration into existing or new products. Its small size, light weight and power efficient operation provide superior performance in embedded systems.
Getting Started
Caution: TRM 900 transceiver must be handled with care during installation. Remove the transceiver from its protective bag only in an ESD safe area.
To set up the hardware components, follow these steps:
- Plug the TRM 900 transceiver into the host product per the assemble drawing and procedure.
- Attach an antenna cable to the TRM 900 transceiver
- Configure the radio through the host GNSS receiver software interface
- Attach the PC interface cable to a serial port on your PC
Interface Port Pin Out
The standard TRM 900 transceiver comprises a 30-pin port for power, data and interfacing with other electronic devices.
The following signals are available on the 30-pin connector:
| Pin | Name | Description |
|---|---|---|
| 1 | GND | GROUND FOR SIGNAL AND POWER |
| 2 | DO NOT USE | FACTORY USE ONLY, NO CONNECTION |
| 3 | TX | TX DATA, DTE SERIAL PORT, 3V CMOS (3.3V COMPATIBLE) |
| 4 | DO NOT USE | FACTORY USE ONLY, PLEASE NO CONNECTION |
| 5 | GND | GROUND FOR SIGNAL AND POWER |
| 6 | DO NOT USE | FACTORY USE ONLY, PLEASE LEAVE NO CONNECTION |
| Pin | Name | Description |
| --- | --- | --- |
| 7 | GND | GROUND FOR SIGNAL AND POWER |
| 8 | DO NOT USE | FACTORY USE ONLY, PLEASE LEAVE NO CONNECTION |
| 9 | GND | GROUND FOR SIGNAL AND POWER |
| 10 | DO NOT USE | FACTORY USE ONLY, PLEASE LEAVE NO CONNECTION |
| 11 | CONFIG | I/O TO FORCE RADIO SWITCH BETWEEN OPERATING MODE AND CONFIGURATION |
MODE
12| DO NOT USE| FACTORY USE ONLY, PLEASE LEAVE NO CONNECTION
13| DO NOT USE| FACTORY USE ONLY, PLEASE LEAVE NO CONNECTION
14| RX| RX DATA, DTE SERIAL PORT, 3V CMOS (3.3V COMPATIBLE)
15| DO NOT USE| FACTORY USE ONLY, PLEASE LEAVE NO CONNECTION
16| DO NOT USE| FACTORY USE ONLY, PLEASE LEAVE NO CONNECTION
17| DO NOT USE| FACTORY USE ONLY, PLEASE LEAVE NO CONNECTION
18| VCC| POWER IN
19| GND| GROUND FOR SIGNAL AND POWER
20| GND| GROUND FOR SIGNAL AND POWER
21| GND| GROUND FOR SIGNAL AND POWER
22| GND| GROUND FOR SIGNAL AND POWER
23| VCC| POWER IN
24| VCC| POWER IN
25| VCC| POWER IN
26| VCC| POWER IN
27| VCC| POWER IN
28| VCC| POWER IN
29| POWER| POWER DOWN RADIO
30| GND| GROUND FOR SIGNAL AND POWER
TX and RX Pins
Pin 3 is used by the TRM900 module to received data from an external device (a
PC, GPS receiver, weather sensor, etc). Pin 14 is used to transmit data to the
external device. The external device is
transmitting data to the TRM 900 on Pin 3, so according to the DTE naming
convention, Pin 3 is called the “TX Data” pin. The external device receives
data from the TRM 900’s Pin 14 so this is
called the “RX Data” pin.
Antenna Port
A coaxial antenna port is provided for connecting the antenna system to the
TRM 900 transceiver. The antenna connector is a 50-Ohm MMCX type. Appendix B
provides part numbers and manufacturer information for compatible interface
and RF connectors.
Warning: Don’t transmit without first connecting an antenna.
Compliance
The TRM 900 transceiver radio modem is designed to be compliant with FCC and
Industry Canada regulatory requirements, including FCC Part 15.247.
Warning: The TRM 900 transceiver is classified as an intentional radiator
of type radio transceiver.
Conducted and radiated emissions of the standard TRM 900 transceiver do not
exceed the requirements of FCC Part 15.247. Trimble is responsible for full
compliance of final product.
Label per FCC Rules
This limited modular transmitter must be labeled with its own FCC ID number.
In the event that the module is installed inside a host device and the FCC ID
of the module is not visible the host device will display a label referring to
the FCC ID of the enclosed module.
Contains: FCC ID: JUP-900MHZ IC: 1756A-900MHZ
Protocols and Modes of Operation
The TRM 900 transceiver radio modem is completely configurable using host GNSS
receiver software.
Configuration parameters define the DTE interface and the over-the-air
protocol. Depending on the application you may need to change the factory
default settings. The following table shows the factory default configuration
of the TRM 900 transceiver.
| Parameter | Default |
|---|---|
| Channel | 1 |
| Baud Rate | 127,381 bps |
| Parity | None |
| Soft Break Disable | Off |
| TX Power | 1.0 W |
| Modulation | BPSK |
| Parameter | Default |
| --- | --- |
| Link Rate | 127,381 bps BPSK |
| EOT | 50 ms |
| Repeater Delay | 0 |
Electrical Considerations
Power Supply
The TRM 900 transceiver has a power supply connection on Pin 18 and Pins 23
to 28 of the interface connector. Pins 1, 5, 7, 9, 30 and Pins 19 to 22 are
connections to both power ground and serial interface signal grounds. Note
that these pins are tied to a common point on the TRM 900 transceiver. If
there is a potential for a ground path current loop due to improper power
application, we recommend a fusible link be inserted in the signal ground to
protect the TRM 900 transceiver.
TRM 900 transceiver modems are designed to operate with unregulated DC voltage
levels between 3.6 and 4VDC. The power supply must be capable of sourcing 2A.
Shielding Considerations
The TRM 900 transceiver is designed to operate in proximity to noise
generating circuitry. However, certain radiated or conducted frequencies may
degrade the performance of the TRM 900 transceiver or render it inoperable.
When possible, provide well-grounded shielding between circuits that radiate,
such as power supplies, voltage-controlled oscillators, crystal oscillators
and the TRM 900 transceiver.
Mechanical Considerations
EMI interferers
The TRM 900 transceiver is easily mounted inside new and existing products.
The TRM 900 transceiver is specifically designed for operation in harsh
environments. For best performance, mount the radio away from potential EMI
radiators and route RF signals apart from digital signals.
Caution: We do not recommend the bundling of the antenna interface cable with other signal cables internal to your product.
Materials
The TRM 900 transceiver is housed in a metal shield that is a conductor and
is electrically connected to the ground and signal ground pins.
Appendix A – Cables and Connectors
Interface Connector
The 30-pin data/power header is a Samtec TFM series housing a standard-
configuration connector, AVX part number 14-5046-030-630-829. The mating
Samtec connector is part number 24-5046-030-600-829 for a board-to-board
interface See AVX website: http://www.samtec.com and
www.AVXcorp.com for other mating connector options.
RF Connector
The RF connector is compatible with an MMCX-style coaxial plug. Plugs are
available from many sources and in many configurations. We use plugs
manufactured by Radiall. Radiall MMCX right-angle plug for use with RG-178
cable is part number R110 172 100. Radiall MMCX straight plug for use with
RG-178 cable is part number R110 083 120.