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
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