I upgraded my HMI500 series to a new cMT HMI and I keep getting PLC No Response error. How do I get my comms working again?

If RS-232 Serial communications on COM1 were used in the original application, the pin out of the COM port has changed with the new cMT HMI. Pins 2 and 3 have been swapped and the gender has also changed. Purchasing a new serial cable specific to the new HMI is recommended. However, you can also purchase a null modem gender changer to be used on the HMI end of the cable.

For more information or if you have further questions, contact Sales@maplesystems.com or give us a call 425.745.3229.

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