A-Class 15
2.2.2.1 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.
2.2.2.2 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 + ---
Port A and COM C Connections
10101010
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