Microcom 324M, Operator'S Manual

Page: 21 / 234

Getting Started Chapter 3
3-4 324M/424M Operator’s Manual - 880026-0144
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 9 to 25 Pin Cable
State
DE-9
Pin # Signals /
Directions
PC
DE-9
Pin #
State
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 3-4 RS-232 Cable Configurations
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.
CAUTION: Connection of a serial port to a parallel port may
result in damage to the printer and/or computer.