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WMBUS MODBUS MASTER - Guide utilisateur / User guide version V1.0.0
5. START-UP
5.1. Cables description
FR
EN
5.2. Link configuration
The Modbus physical layer supports a RS485 (defualt) or RS232 serial link. The bit 0 of register 321 allows to configure this choice :
•
Bit 0 = 0 (default): RS485
•
Bit 0 = 1: RS232
On the other hand, a 3-way switch present on the electronic board allows the configuration of the end-of-line resistor and the RS485 bus
polarization:
•
Switch 1 = ON (RS-485 bus end-of-line resistor)
•
Switches 2 and 3 = ON (RS-485 bus polarization)
The default switch configuration is all channels ON.
Important: in case of RS232 configuration, the 3 channels of the switch must be set to OFF.
2-Wire Power Cord
1 _+ EXT POWER
2_- EXT POWER
Signal cord 7 FILS
3_- SENSOR POWER SUPPLY
4_+ SENSOR POWER SUPPLY
5_TX (B)
6_RTS (not managed)
7_RX (A)
8_CTS (not managed))
9_GND
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