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Am using Red Lion display, model PAX2D, with an option card for RS232, and want use Modbus RTU to display values from a V350. I can get successful comm. by connecting RXD from display to RXD(pin 3) on V350, and TXD to TXD(pin 4) with no ground. As soon as common (pins 2 or 5 on V350) are connected to RS232 common on display, comm. halts. By wiring as above, I can read values from registers in the display, but they seem to be random numbers, not anywhere close to what they should be. For instance when reading register 40483(display baud rate), a value of 8960 is returned no matter what the baud rate is actually set at, and I would be expecting to see a number from 0 to 5 for the 5 baud rates available on the display. PAX2D display manual: http://www.redlion.net/Products/Groups/Counter/Rate/PAX2D/Docs/04038.pdf PAX2D Modbus table: http://www.redlion.net/Products/Groups/Counter/Rate/PAX2D/Docs/04045.pdf PAX2D RS232 option card manual: http://www.redlion.net/Products/Groups/PAXOptionCards/PAXCDC1,2/Docs/12018.pdf V350 program: https://www.dropbox.com/s/86hmdjtqg0qdkqd/Test%20Display.vlp I talked with Red Lion tech support to make sure display setup is correct. Appreciate any help!