Cable Configurations; Rs-232 Serial Cables; Usb Communication Interface - Microcom 424M Operator's Manual

Getting Started
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

The 324M printer provides a single USB port for communication to a host device. In order
to communicate with the printer, the USB driver must be installed on the host computer.
This may be downloaded at http://www.microcomcorp.com/drivers.htm. The Windows
combined driver model (CDM) may be installed on XP, VISTA, Windows 7 or Windows 8
allowing applications to access FTDI devices through either the D2XX DLL or a COM port
without having to change driver type. However, it should be noted that an application can
only communicate through one of these interfaces at a time and cannot send commands to
the D2XX DLL and the associated COM port at the same time.
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 - 880026-0144
Chapter 3
PC
Signals /
DB-25
Directions
Pin #
DCD
RXD
TXD
DSR 20
GND
DTR
CTS
RTS
8
3
2
7
6
4
5
-