Microcom 322M - Manual (Page 25)

322M Operator’s Manual
21
Chapter 4: Communication
4.1 RS-232D Serial
The printer provides a 9 pin female D-Sub connector, on the rear panel, for RS-232D serial
communication. The printer is configured as DCE (Data Circuit-terminating Equipment) so a
NULL modem cable is not necessary. A serial data cable is required to use serial
communications, refer to Table 7 below for correct cable configurations.
The factory settings, unless otherwise requested, are set at 9600 baud, 8 data bits, 1 stop
bit and no parity with both hardware and software handshaking enabled. The baud rate is
user selectable from 1200 to 115,200 and uses software XON/XOFF flow control and/or
hardware CTS handshaking.
9 to 9 Pin Cable 9 to 25 Pin Cable
State
322M
DE-9
Pin #
Signals /
Direction
PC
DE-9
Pin #
State
322M
DE-9
Pin #
Signals /
Directions
PC
DB-25
Pin #
XX 1 DCD DCD 1 HI 1 DCD DCD 8
XX 2 TXD RXD 2 XX 2 TXD RXD 3
XX 3 RXD TXD 3 XX 3 RXD TXD 2
HI 4 DTR DSR 4 HI 4 DTR DSR 20
LO 5 GND GND 5 LO 5 GND GND 7
HI 6 DSR DTR 6 HI 6 DSR DTR 6
DC 7 RTS CTS 7 DC 7 RTS CTS 4
XX 8 CTS RTS 8 XX 8 CTS RTS 5
HI 9 +5V +5V 9 HI 9 +5V -
DC = DO NOT CARE XX = INDETERMINATE
Table 7 RS-232 Cable Configurations
If XON/XOFF handshaking is used, the only signals that the printer requires are the RXD,
TXD, and GND signals. If the hardware handshaking is used the CTS and RTS signals are
required. The other signals are offered in the event that the host computer would require
them.