User talk:Achims

Modbus Control commands for R6 extension module:

This commands give you the possibility to control the relays on a R6 extension module via a modbus command send as a hex-file in a tcp stack.

It is easy to connect the R6 extension module to the RS485 interface of a Barix device. You have to wire Pin6 (A) and Pin9 (B) of the DB9 connector to Pin2 (A) and Pin3 (B) of the J1 connector on the R6 extension module.

Additional you have to power up the R6 extension module on Pin4 (+) and Pin5 (-) on J1 with an external power supply.

The serial settings for the RS485 interface (Serial 2) should set to a baudrate of 19200 Bd, a data bitrate of 8 bits, parity set to even, 1 stopbit, handshake set to RS485 direction control and local port to 502.

Now it is possible to send a hex-file, which includes the modbus command, via tcp to port 502 of the device. This can be done with the NetCat Application (nc ip-barix port < filename).

Modbus commands
Modbus Address Single Coil Address HI Address LO Values HI Values LO CRC LO CRC HI
Relay 1 Set 00 05 00 00 FF FF CD AB
Reset 00 05 00 00 00 00 CC 1B
Relay 2 Set 00 05 00 01 FF FF 9C 6B
Reset 00 05 00 01 00 00 9D DB
Relay 3 Set 00 05 00 02 FF FF 6C 6B
Reset 00 05 00 02 00 00 6D DB
Relay 4 Set 00 05 00 03 FF FF 3D AB
Reset 00 05 00 03 00 00 3C 1B
Relay 5 Set 00 05 00 04 FF FF 8C 6A
Reset 00 05 00 04 00 00 8D DA
Relay 6 Set 00 05 00 05 FF FF DD AA
Reset 00 05 00 05 00 00 DC 1A

Please note: It is necessary to calculate a crc-check-sum for each command and add it to the command itself.

Here you can find a online crc-calculator: http://www.lammertbies.nl/comm/info/crc-calculation.html