12
A-Class
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
RXD
+
RTS
3 TX
TXD
–
Ground
4 DTR
RXD
–
TX
5 Ground
Ground
RX
6 ---
---
Ground
7 RTS
RTS
CTS
8 CTS
CTS
DTR
9 ---
TXD
+
---
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).
Summary of Contents for A-Class Mark II
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