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What would cause issue can not connect to 984 PLC with Modbus cable stuck in dim awareness?

The error can be the cable and it has to do with the DTR / DSR that cross on the cable. With new PC's that are more energy efficient only put out 3.3 volts on the DSR and it needs 5 vdc. To fix the issue tie the DTR / DSR pins 4 and 6 together on both side and not cross them. This will set the DSR high and will now be able to transmit and communicate.


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