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Summary of Contents for Linx TRM-868-EUR
- Page 1 TRM-868-EUR RF Transceiver Module Data Guide...
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Page 2: Table Of Contents
ANSI and NFPA standards. It is solely the responsibility Hardware Reset of any Linx customer who uses one or more of these products to Voltage Supply Rise Time incorporate appropriate redundancies and safety standards for the Life and Property Safety Situation application. -
Page 3: Description
Common Antenna Styles Data Guide Regulatory Considerations Description 0.935 (23.75mm) The TRM-868-EUR combines a state-of-the art low power wireless transceiver with a powerful multipoint-to-multipoint protocol controller 0.800” (20.32mm) to form a complete wireless communication solution capable of replacing wires in almost any RS-232/422/485 application. -
Page 4: Ordering Information
Ordering Information Parameter Symbol Min. Typ. Max. Units Notes Part Number Description Radiotronix Cross TRM-868-EUR 868MHz EUR Series Transceiver WI.232EUR Power Supply Operating Voltage TRM-915-DTS 900MHz DTS Series Transceiver Wi.232DTS-R 900MHz DTS Series Transceiver - Brazil TX Supply Current 1,2,5 TRM-915-DTS-BRZ Wi.232DTSB-R... -
Page 5: Pin Assignments
Pin Assignments EUR Series Transceiver Specifications Parameter Symbol Min. Typ. Max. Units Notes DTS Mode LP Mode Transmitter Section Output Power Harmonic Emissions Frequency Deviation RESET DTS Mode ±80 LP Mode ±40 Interface Section Input Logic Low 0.3*Vcc Figure 5: EUR Series Transceiver Pin Assignments (Top View) Logic High 0.7*Vcc Pin Descriptions... -
Page 6: Theory Of Operation
Theory of Operation Module Description The EUR Series transceiver is a low-cost, high-performance synthesized The EUR Series RF transceiver module has a Universal Asynchronous FSK transceiver. Its wideband operation gives it outstanding range while Receiver Transmitter (UART) serial interface and is designed to create still meeting regulatory requirements. -
Page 7: Digital Transmission System (Dts)
Digital Transmission System (DTS) DTS systems, depending on the energy density of the DTS system. However, a DTS system is a good compromise between FHSS and DSSS. The EUR Series transceiver utilizes a DTS digital spread spectrum technique. This technique increases the transmission bandwidth to over Protocol 500KHz and the outgoing RF data is encoded with symbols selected to ensure its average duty cycle is 50%. -
Page 8: Reset To Factory Default
Reset to Factory Default IDs match, and the master/slave rules are satisfied (if peer to peer is selected in the receiving module, this test passes regardless), the module It may be necessary to reset the non-volatile registers to their factory decodes the data and outputs it on the RXD line. -
Page 9: The Uart Interface
The UART Interface int EscapeString(char *src, char src_len, char *dest) The module uses a standard UART interface for both data to be sent over the air and for configuring the module. The CMD line is used to tell the // The following function copies and encodes the first module if the data on the UART is for configuration or transmission. -
Page 10: Configuration Registers
Configuration Registers EUR Series Configuration Registers The EUR Series module contains several registers that control its Name Address Location Operation Description configuration and operation. The register settings are stored in two types regNVTXCHANNEL 0x00 Transmit channel setting of memory inside the module. Volatile memory is quick to access, but it is regNVRXCHANNEL 0x01 Receive channel setting... -
Page 11: Writing To Registers
Writing to Registers Channel Settings - Address = 0x4B, 0x4C; NV Address = 0x00, 0x01 The DTS Series supports 2 channels (0 – 1) in DTS mode and 6 channels Writing to a volatile register is nearly instantaneous. Writing to a non-volatile (0 –... -
Page 12: Configuration Registers
Configuration Registers UART Data Rate - Address = 0x4E; NV Address = 0x03 The UART data rate is set by the regDATARATE (addr 0x4E) register. The default UART data rate is 2.4kbps but can be changed by setting the Power Mode - Address = 0x4D; NV Address = 0x02 regNVDATARATE (addr 0x03) register. - Page 13 Network Mode - Address = 0x4F; NV Address = 0x04 Transmit Wait Timeout - Address = 0x50; NV Address = 0x05 The module supports two networking modes: Normal and Slave. In When a byte is received from the UART, the module starts a timer that normal mode, the module can talk to any other module.
- Page 14 Network Group - Address = 0x51; NV Address = 0x06 CRC Control - Address = 0x53; NV Address = 0x08 Modules can be grouped into networks. Although only modules with the The EUR Series protocol includes a Cyclic Redundancy Check on the same network group ID can communicate, modules in different network received packets to make sure that there are no errors.
- Page 15 UART Minimum Transmission Unit - Addr = 0x54; NV Addr = 0x09 Verbose Mode - NV Address = 0x0A This register determines the UART buffer level that triggers the transmission Setting this register to 0x00 suppresses the start-up message, including of a packet.
- Page 16 CSMA Enable - Address = 0x56; NV Address = 0x0B Sleep Control - Address = 0x58; NV Address = 0x0D Carrier-Sense Multiple Access (CSMA) is a best-effort delivery system that Setting this register to 0x01 places the module into Sleep mode and 0x02 listens to the channel before transmitting a message.
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Page 17: Typical Applications
Typical Applications MAC Address - NV Address = 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 The MAC Address registers make a 48-bit MAC address that uniquely Figure 36 shows a circuit using the EUR Series transceiver. identifies each module. These values are factory preset and cannot be altered. -
Page 18: Power Supply Requirements
Figure 39 which address in depth key areas Vcc IN noise can significantly affect the module’s of RF design and application of Linx products. These applications notes 10µF performance, so providing a clean power supply are available online at www.linxtechnologies.com or by contacting the Linx... -
Page 19: Interference Considerations
Comparing your own design with a Linx evaluation board can help to determine if and at 0.080 what level design-specific interference is present. -
Page 20: Microstrip Details
This is a critical factor, especially Do not route PCB traces directly under the module. There should not be in high-frequency products like Linx RF modules, because the trace any copper or traces under the module on the same layer as the module, leading to the module’s antenna can effectively contribute to the length... -
Page 21: Production Guidelines
Washability Figure 44: Absolute Maximum Solder Times Automated Assembly The modules are wash-resistant, but are not hermetically sealed. Linx recommends wash-free manufacturing; however, the modules can be For high-volume assembly, the modules are generally auto-placed. subjected to a wash cycle provided that a drying time is allowed prior The modules have been designed to maintain compatibility with reflow to applying electrical power to the modules. - Page 22 General Antenna Rules plane as possible in proximity to the base of the antenna. In cases where the antenna is remotely located or the antenna is not in close The following general rules should help in maximizing antenna performance. proximity to a circuit board, ground plane or grounded metal case, a metal plate may be used to maximize the antenna’s performance.
- Page 23 There are hundreds of antenna styles and variations that can be employed directly on a product’s PCB (Figure 52). This with Linx RF modules. Following is a brief discussion of the styles most makes it the most cost-effective of antenna commonly utilized.
- Page 24 Email: labinfo@fcc.gov and certification process. Here at Linx, our desire is not only to expedite the design process, but also to assist you in achieving a clear idea of what is...
- Page 25 Under no circumstances shall any user be conveyed any license or right to the use or ownership of such items. ©2015 Linx Technologies. All rights reserved. The stylized Linx logo, Wireless Made Simple, WiSE, CipherLinx and the stylized CL logo are trademarks of Linx Technologies.
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