Hello. I have some old scales that are currently communicating DF-1 Full Duplex to a board-level device. I'm looking to replace the board level device with a ControlLogix. I may not be creating my messages correctly, but I'm 90% sure I am. I've been evesdropping on the existing setup in order to create the correct messages when I rip out th eold board level device. I'm getting Negative Acknowledgements from the scales when I send my response and Acknowledgement.
I've become confused today as I started reading AB Document 1770-rm516, DF-1 Protocol and Command Set. It shows 4 comm paths, 2 Tx and 2 Rx for Full Duplex. The existing connection on the machine are 3 wire, Rx, Tx and GND. I'm using a 3rd party device for the serial communications and am comfortable with its functionality. I've written my own DF-1 driver within my processor.
Does a DF-1 Full Duplex link use 5 wires, Tx1, Tx2, Rx1, Rx2 and GND? Has anyone wired up and written their own DF-1 Driver in ControlLogix?
Thank you for any help.
I've become confused today as I started reading AB Document 1770-rm516, DF-1 Protocol and Command Set. It shows 4 comm paths, 2 Tx and 2 Rx for Full Duplex. The existing connection on the machine are 3 wire, Rx, Tx and GND. I'm using a 3rd party device for the serial communications and am comfortable with its functionality. I've written my own DF-1 driver within my processor.
Does a DF-1 Full Duplex link use 5 wires, Tx1, Tx2, Rx1, Rx2 and GND? Has anyone wired up and written their own DF-1 Driver in ControlLogix?
Thank you for any help.