[Dan Fritz]

Al_The_Man is right. (Hi Al)

The 20-pin Honda connectors used on the Fanuc 10/11/12/15 and some later controls all had the same pin assignments.

20-pin Honda ------------------------------- DB25-pin (on the outside of the cabinet)

Pin 5 (ER) -------------------------------------- Pin 20 (DTR) Data Terminal Ready - output that Fanuc turns HIGH when it opens the port
Pin 8 (RD) -------------------------------------- Pin 3 (RX) Receive Data - input for serial data received from other device
Pin 9 (SD) -------------------------------------- Pin 2 (TX) Transmit Data - output for serial data sent from Fanuc to other device
Pin 16 (CD) ------------------------------------ Pin 8 (DCD) Data Carrier Detect - input from other device. used by MODEMS to detect phone carrier signal.
Pin 17 (SG) ------------------------------------ Pin 7 (SG) Signal Ground - ground reference for all signals
Pin 18 (DR) ------------------------------------ Pin 6 (DSR) Data Set Ready - input to Fanuc indicating that the other device is ready
Pin 19 (CS) ------------------------------------ Pin 5 (CTS) Clear to Send - input to Fanuc that MUST be high for the Fanuc to transmit (hardware handshake)
Pin 20 (RS) ------------------------------------ Pin 4 (RTS Request to Send - output that Fanuc turns high when it opens the port

[Al_The_Man]

Al_The_Man is right. (Hi Al)

Hi Dan, where you been, I'm all alone here!:drowning:

Charles, run your other Issue by Dan!
Al.