To communicate to a Modbus device via a serial cable, you have two options:

1. Install a BMXNOM Modbus Serial card into your M580 PAC and
wire/configure for serial cable connectivity.

2. Use a EGX150 ModbusTCP to Modbus gateway and configure gateway for serial
cable. In both scenarios, you will need to program READ_VAR and WRITE_VAR
function blocks to communicate to your ATV61, you can find more info in the
unity pro help about the READ_VAR and WRITE_VAR function blocks.

For addressing BMXNOM module placed in M580 drop you must use ADDMX function
block.

To address a Modbus server or slave using Modbus protocol, the IN parameter
must be ‘r0.s0.ch0.{ip.ip.ip.ip}\\r1.s1.ch1.d, where:

r0.s0.ch0 is a position of M580 Ethernet port which will send TCP modbus
request (rack, slot and channel number) , {ip.ip.ip.ip} is a BM.CRA312..
module with ip.ip.ip.ip address.

r1.s1.ch1.d is Modbus server module rack, slot, channel, and Modbus slave
number.

For more information please look to Unity help, ADDMX function or to Unity
Pro Communication Block Library manual.
 

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