Microcom 428T - Manual (Page 19)

Chapter 3 Getting Started
428T Operator’s Manual - 880037-0141 3-3
3.3.1 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 3-1 RS-232 Cable Configurations
3.4 USB Communication Interface
The 428T 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.
3.4.1 USB Driver Setup
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.