PRELIMINARY U-Link TRx Radio DATA MODEM User Guide
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U-Link TRx User Guide Table of Contents Table of Contents ..................................................................................................................................................... 1 About this document ................................................................................................................................................ 1 Compliance to FCC US/CANADA ..........................................................................................................
U-Link TRx User Guide Compliance to FCC US/CANADA This equipment has been tested and found to comply with the limits of Part 90 of the FCC Rules and CNR 119 for CANADA. 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.
U-Link TRx User Guide This input is protected against reverse polarity, and short transient voltage by a Transil protection. + - ON 1 2 ON TX-RX + DC Supply -. A light continuously on when the transceiver is powered on. The color of this light is changed according to the selected serial link mode (RS232 Æ Green, or RS422 Æ Red). Corresponding marking of the light shall indicate “ON Serial link wiring U- link Trx proposes 2 types of serial link : RS232 and RS422. No hardware flow control is used.
U-Link TRx User Guide A dual color light indicates the stae of the U-Link TRX : • Green when the data are received, and red when data are transmitted. Green light indicating data reception, shall represent the activity on the serial link of the receiver, and the red light indicating data emission, shall represent RF activity at the output of the transmitter.
U-Link TRx User Guide Operating modes Two operating modes are available: 1- Command mode (usage of AT commands) 2- Normal mode (Serial data are transmitted on radio link) At power up the UHF radio device is in normal mode: it is able to send or receive data to or from the radio link according to its current parameter configuration. Command mode The command mode is used to read and update the UHF radio configuration registers using AT command.
U-Link TRx User Guide AT commands The list of AT commands supported by the UHF radio is : General commands Commands ATO +++ ATSn ? ATSn=m AT&W AT/S AT/V ATR ATT1 ATT2 ATT3 Description Operating mode selection Return into normal mode Command mode activation Registers management Displays the Sn register content where n represents the register number. The response has the following format: Sn=y Set the register value with ‘m’. n represents the register number.
U-Link TRx User Guide R/W S251 Over the air format R/W S252 CSMA mode R/W S253 CSMA mode RSSI threshold R/W S254 RF link speed R/W S255 Squelch R/W R/W R/W R/W 0 Æ transparent mode 1 Æ DSNP mode 0 Æ Disable CSMA mode 1 Æ Enable CSMA mode Check if channel is free with RSSI before transmitting. Response is “OK” if channel is free, and “KO” if channel is busy. S253=-xxxdBm with xxx decimal value.
U-Link TRx User Guide Frequency Range Channel Spacing The frequency range is 450MHz up to 470MHz. Input RF filters bandwidth is the central frequency adjusted in factory +/- 3MHz. The channel spacing is 12.5 kHz. Modulation The transceiver is able to process GMSK BT=0.5 modulation with raw data throughput of 9600 bits/s. Transmitter output power The RF output power on 50ohms load is software selectable between: 0.5W (27dBm), 2W (33dBm), and 4W (36dBm).
