Manufacturer’s address Parc technologique PRE ROUX IV 283 rue Paul Louis NEEL 38920 CROLLES - FRANCE declares that the product Product Name: ARF35 Product Number(s): ARF7120C / ARF7120D / ARF7120E / ARF7120F Product options: conforms to the RTTE Directive 99/5/EC: EMC: conformity is proven by compliance to the standard EN 301489 according to the requirements of EMC Directive 89/336/EEC.
PRESENTATION The modem converts data from a serial link into a radio frame to be sent to a similar piece of equipment. radio transmission Serial link RS232 / RS485 The operating parameters of these modems (serial link, radio management….) can be modified through commands on the serial link.
Retirer les vis de la partie Remove these screws avec presse étoupe The ARF35 range products are supplied from a DC voltage source. This voltage source must be 8V minimum and must not exceed 30 V CTS TX+ Supply.
SERIAL LINK WIRING • MODEM / DTE RS232 This is for example the case of a modem connected to a PC N° / SUB-D 9 N O M + Vcc IN H IB G ND T XD C TS • DCE RS232 This is for example the case of a modem connected to a measuring device.
PCB revision A BUS RS485 NAM E + Vcc INH IB TX+ et RX+ TX+ and RX+ connected together by the USER TX- et RX- TX- and RX- connected together by the USER jumper Figure 2: RS485 wiring, PCB marked ARF7120/A The wiring could be checked by sending the SLI command using a terminal (see serial command).
RADIO COMMUNICATION • Communication channels This modem has 2 or 5 channels that could be selected through commands 2-channel version 5-channel version Frequency Frequency (Radio data rate 34800 (Radio data rate 9600 kbit/s) kbit/s) 869.4625 MHz 869.425 MHz 869.5875 MHz 869.475 MHz 869.525 MHz 869.575 MHz...
WORKING MODE Half duplex transmission This modem has 2 working modes: Transparent mode, without flow control. When transmitting, data received from the serial link are transmitted on the radio link. When data are received on the radio link, these data are sent on the serial link. Addressed mode, with flow control (see register S216) In these modes, the frame transmission always start on the following conditions: •...
• Set of commands Commands Description Note SL#I=xxxx Program all the addresses (TX/ RX) with value xxxx = hexadecimal address (0000... FFFF) SL@R? Display the reception level of the latest received message. Response: -xxx dBm with xxx decimal value The RSSI values are between –115 and –60 dBm. SL**>...
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As a reminder: the parameters are saved with the SL**> command. Note 4: If the flow control is not used, the serial data rate must be coherent with the radio rate. For example, with the 5-channel version the radio rate is 10 kbit/s: a serial rate of 9600 must be used without flow control, while using a serial rate of 19200 will produce data overrun (radio reception buffer) 06-06-V6-smn...
Configuration of the serial interface The choice between the RS232 or 485/422 interface depends of the S215 register value. There is two ways for activating the RS485 mode: Software mode (updating the S215 value using a command) Hardware mode (forcing default parameters) Serial interface switching, software mode For switching from RS232 to RS485 interface: Step 1.
• MODBUS compatibility The ARF35 is MODBUS RTU and ASCII compatible, if the following recommendation is fulfilled: the radio rate and the serial rate must be equivalent (this for avoiding a MODBUS packet splitting). With the 10 kbit version (radio rate) the serial speed must be 9 600 baud With the 40 kbit version (radio rate) the serial speed must be 38 400 baud •...
SPECIFICATIONS General technical characteristics • Operating temperature: -20 to +70 °C • Power supply: 8 to 30 Volts (integrated regulator) • Size: 145x100x40 mm + 85 mm antenna • Number of channels: 2 or 5 • Modulation: • Packaging: IP65 box with integrated or external antenna Transmission •...
ANNEX 1 : Firmware updates Firmware Updates V1.06 Add Baudrate 600 and 1200bps /V10.06 Increase RS485 buffer deactivation time (when the modem ends data transmission to equipment) for baudrate 2400 and 4800bps. Add the delay for 600 and 1200bps baudrates. Increase RS485 buffer deactivation time for command mode to be able to work properly to every baudrate.
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