What cable do I use for Modbus Serial Communication between Harmony HMIST6 / HMISTM6 and BMXP341000/2000/2020?
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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