Modbus TCP

[gomond]

Hi Archie
I am a total newbie and just getting my head around this stuff.
I have been using a modbus client (comtest pro from baseblock, awesome) and I can read the meter by setting it to unit address 1, function 3 and read address 0x5000 and it returns a bundle of numbers representing the current energy consumed in kWh.

In advanced HMI I have set the modbus connector to the IP address  192.x.x.x, unit id 1 but I dont know what to put in the PLCaddressxxx fields on the meter objects and the like.

I am enjoying the learning process, though I feel pretty dumb at present.
A modbus video would be awesome..

Thanks.

[gomond]

Would I be correct if I assumed that the PLC address field should contain 320480 to read holding register 0x5000 (20480 dec) ?

I am also assuming that the unit id on the ModbusTcpCom is the remote device ID (like rtu/485).
so does this mean that for every device on  the 485 bus via the transparent converter a separate instance of ModbusTcpCom would need to be created.

Cheers.

[gomond]

I just got home and tried the above and it returned INVALID VALUE RETURNED "Illegal modbus function".
So I I guess that is not the answer.