USB to PLC through SNP adapter


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USB to PLC through SNP adapter USB to PLC through SNP adapter

Symptom:

I am running LogicMaster (or GE-Fanuc) under WinXP and am having problems connecting from a non-Digi USB/232 adapter to a Series 90 Micro PLC going through an SNP adapter.

When I switch from offline to monitor the LED indications on the USB/232 adapter that LogicMaster90 is using to communicate with the Micro PLC, LogicMaster90 displays no communications. However, this does work off my system running Windows 2000.

Cause:

To initiate an SNP communications session the PLC expects a "Long Break" to come across the serial interface, which many non-Digi USB/232 products fail to do.

Solution:

The Digi Edgeport USB serial product has been tested in this environment and does work.