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I'm trying to communicate with a power meter using MODBUS RTU. The cable is only 1 meter long. I have a RS-485 to RS-232 converter connected to a RS-232 to USB converter. I use MODBUS Poll and receive Write Error: Break Condition and then Checksum Error.
The electric meter has a bias resistance option. Without Bias resistance the RX light on the meter is illuminated indicating an open circuit. When I enable Bias resistance the RX light on the meter turns off but simultaneously the RX light on the RS-232 to USB converter illuminates.
The RS-232 USB converter also has a light to indicate TX. When I use MODBUS poll the TX light will flash so I know I'm transmitting but the RX light always remains illuminated and I receive the errors mention previously.
Thank You for any help you can provide,
-Derek
The electric meter has a bias resistance option. Without Bias resistance the RX light on the meter is illuminated indicating an open circuit. When I enable Bias resistance the RX light on the meter turns off but simultaneously the RX light on the RS-232 to USB converter illuminates.
The RS-232 USB converter also has a light to indicate TX. When I use MODBUS poll the TX light will flash so I know I'm transmitting but the RX light always remains illuminated and I receive the errors mention previously.
Thank You for any help you can provide,
-Derek