Datamax-O'Neil A-Class Mark II Operator’s Manual - Manual (Page 22)

12 A-Class Mark II
2.3.1 Parallel Port Connections
The parallel interface requires a Centronics
IEEE 1284 cable with a 36 pin male connector. Bi-
directional mode is IEEE 1284 compliant, allowing data to be returned to the host.
2.3.2 Serial Port Connections
Serial Port A supports RS-232C and RS-422/RS-485 communications; COM C and COM D support
RS-232 (see Appendix D for exceptions). Pin-outs are given below. The port baud rate, word
length, parity, stop bits, and protocol must be configured to match the host’s settings; see Section
4.2.5.
Port A, and COM C (J4) Port A, only COM D (J3)
Pin
Number RS-232 Function RS-422 & RS-485 Function RS-232 Function
1 +5V (@ .5 amps) --- +5V (@ .5 amps)
2 RX RX- RTS
3 TX TX+ Ground
4 DTR --- TX
5 Ground GND RX
6 --- --- Ground
7 RTS TX- CTS
8 CTS RX+ DTR
9 --- --- ---
For proper data exchange, the serial interface requires specific cable pin-outs. Serial cable
part numbers and wiring diagrams are shown below.
RS-232 Cables*
Part # 32-2300-01 Part # 32-2301-01
*Printer serial ports A & C require a DB9 male connector (e.g., Startech C9PSM).