BossEngineering Posted September 14, 2022 Report Share Posted September 14, 2022 The PLC is a Jazz2 JZ20-R31 with the latest firmware installed. I was attempting to switch from Ethernet communication to RS485. I used the parameters outlined in the U90 help file to code 2 ladder blocks to configure for modbus and also configure the RS485 adapter. I was unable to get the RS485 adapter working possibly due to incorrect parameters. Screen grabs of the 2 ladder blocks are attached. The problem is that I can no longer connect to the Jazz R31 through the built in USB port to correct any errors in programming. How can I re-establish the USB com port? Is there a way to reset to factory defults? Thanks in advance, Rob Quote Link to comment Share on other sites More sharing options...
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