Cable Configurations; Rs-232 Serial Cables; Usb Communication Interface - Microcom 324M Operator's Manual

Getting Started
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, then the CTS and RTS signals
are required. The other signals are offered in the event that the host computer would
require them.
3.2.2.1

RS-232 Serial Cables

The printer uses a standard through serial cable, typically referred to as a modem cable,
which may be purchased through Microcom Corporation or a local computer supply
company. A NULL-modem cable is not required because the printer is configured as DCE.
For a 25-pin serial communication port – Use a 25-pin female to 9-pin male cable.
For a 9-pin serial communication port – Use a 9-pin female to 9-pin male cable.
9 to 9 Pin Cable
DE-9
State Pin # Directions
XX 1 DCD
XX 2 TXD
XX 3 RXD
HI 4 DTR
LO 5 GND
HI 6 DSR
DC 7 RTS
XX 8 CTS
HI 9 +5V
DC = DO NOT CARE
CAUTION: Connection of a serial port to a parallel port may
result in damage to the printer and/or computer.
3.2.3

USB Communication Interface

A standard USB 1.1 connector is provided on the rear panel of the printer. The USB port
operates as a virtual serial communications port and requires the installation of the
Microcom Corporation supplied USB driver for proper operation. The USB cable must be
connected to a host PC that is already powered on before the printer is turned on. The
^D108 command is used to select the USB port and requires a power cycle to take affect.
3-4
PC
Signals /
DE-9
Pin #
DCD 1
RXD 2
TXD 3
DSR 4
GND 5
DTR 6
CTS 7
RTS 8
+5V 9
Table 3-4 RS-232 Cable Configurations
9 to 25 Pin Cable
DE-9
State Pin #
HI 1 DCD
XX 2 TXD
XX 3 RXD
HI 4 DTR
LO 5 GND
HI 6 DSR
DC 7 RTS
XX 8 CTS
HI 9 +5V
XX = INDETERMINATE
324M/424M Operator's Manual - 880026-1001
Chapter 3
PC
Signals /
DB-25
Directions
Pin #
DCD
RXD
TXD
DSR 20
GND
DTR
CTS
RTS
8
3
2
7
6
4
5
-