Article - CS333112
Checksum Errors Occur When Connecting to Allen-Bradley PLCs Using DF1 with a Modem
Modified: 02-Nov-2020
Applies To
- Kepware Server (formerly KEPServerEX) 5.19.467.0 to 6.8
- ThingWorx Kepware Server (legacy) 8.0 to 8.4
Description
Problem: 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). Solution: In the modem configuration, set the modem to Clear to Send.
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