Issue:
I would like to establish Modbus Serial Communications between a Harmony HMIST6 or HMISTM6 series HMI and a Modicon M340 PLC with the front RJ45 Modbus Serial Port (Part Numbers BMXP341000, BMXP342000, BMXP342020). What cable do I use?
Product Line:
Harmony HMIST6: HMIST6200, HMIST6400, HMIST6500, HMIST6600
Harmony HMISTM6: HMISTM6200, HMISTM6400
Modicon M340: BMXP341000, BMXP342000, BMXP342020
Environment:
Modbus Serial Cabling between HMI and PLC
Resolution:
This table below lists all possible connection types between the HMIST6/HMISTM6 models and the M340 PLC with the associated required Serial Cable:
| HMI Part Number | HMI Serial Port | Serial Communication Standard | Cable Part Number |
| HMIST6200 | COM1 (RJ45) | RS-485 | XBTZ9980 |
| HMIST6400 | COM1 (Dsub9) | RS-232 | TCSMCN3M4F3C2 |
| HMIST6400 | COM2 (RJ45) | RS-485 | XBTZ9980 |
| HMIST6500 | COM1 (Dsub9) | RS-232 | TCSMCN3M4F3C2 |
| HMIST6500 | COM2 (RJ45) | RS-485 | XBTZ9980 |
| HMIST6600 | COM1 (Dsub9) | RS-232 | TCSMCN3M4F3C2 |
| HMIST6600 | COM2 (RJ45) | RS-485 | XBTZ9980 |
| HMIST6700 | COM1 (Dsub9) | RS-232 | TCSMCN3M4F3C2 |
| HMIST6700 | COM2 (RJ45) | RS-485 | XBTZ9980 |
| HMISTM6200 | COM1 (RJ45) | RS-485 | XBTZ9980 |
| HMISTM6400 | COM1 (RJ45) | RS-485 | XBTZ9980 |
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