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Kepware Knowledge Base: Solution

Checksum Errors Occur When Connecting to Allen-Bradley PLCs Using DF1 with a Modem

Last Update: 11/12/2018

Checksum errors are posted to the KEPServerEX Event Log when connecting to Allen-Bradley PLCs using the Allen-Bradley DF1 Driver with a modem.

Possible Cause:
The modem may not be configured for Clear to Send (CTS).

In the modem configuration, set the modem to Clear to Send.

Related Protocols
Allen-Bradley DF1