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CNC / DNC Settings for Fanuc Oi

Configuring the Fanuc Oi controller requires precise machine parameter settings and a verified physical interface connection. Establishing stable DNC (drip-feed) communication demands that baud rate, stop bits, and flow control (software XON/XOFF or hardware RTS/CTS) match exactly between the EasyDNC software and the Fanuc control. Common connection pitfalls include mismatched parity settings or handshake protocol conflicts. When troubleshooting, ensure the I/O channel aligns with your physical port assignment and verify that cabling follows standard RS-232 pinout specifications to avoid buffer overflows or frame errors during high-speed data transmission. Use the following parameters as a baseline to ensure reliable, high-performance serial communication between your PC and your CNC machine.

More information about the RS232-Port and the ALARM 086 (DR SIGNAL OFF / READER NOT READY) can be found here

More information about the ALARM 087 (Buffer Overflow) can be found here

Parameter Value Comments
000000000010
00200
010000100000
010110000001
01020
01039 (BaudRate 2400)
 6 = 300 / 7 = 600 / 8 = 1200 / 9 = 2400 / 10 = 4800 / 11 = 9600
TV Check0 = Disabled
Punch Code1 = ISO
I/O Channel0
Drip Feed: Select Auto/DNC mode on the control. Press Cycle Start. Then go to the computer, prepare the program and click 'Send'. As data begins to flow the machine moves.
In EasyDNC set Baud Rate, Parity, DataBits and StopBits as above. Set 'Mode=Auto or Fanuc'.

Cable Diagram 1

The cable illustrated above is the most commonly used version and supports XON/XOFF (DC1/DC3) flow control. If your CNC machine is configured for RTS/CTS (hardware) flow control, please refer to the alternative wiring diagram below, which typically supports both methods of communication.

Cable Diagram 2