There are two cable part numbers that can be used to communicate between the M221 and HMISTU over RS485 MB serial.
- XBTZ9980 (2 RJ45 connectors)
- VW3A8306R** (2 RJ45 connectors)

- ** = length of cable (03 = 0.3M, 10 = 1M, 30 = 3M)

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