Page B-1
APPENDIX B: SERIAL PORT INFORMATION
B.1
COM1 SERIAL PORT
B.1.1
CONNECTING THE SERIAL PRINTER
The COM1 serial port is a simplex RS-232 port designed for connection to a serial printer.
Figure B-1 shows the serial port pinout. Figure B-2 shows a suggested cable diagram for a
dot matrix serial printer. Figure B-3 shows a suggested cable diagram for a thermal serial
printer. The cable shown in Figure B-3 is a standard Transcell cable – Model NMC-1.
Note
: The COM1 serial port contains a non-standard pinout for a DSUB9 connector.
Earlier DCSG models may contain a standard pinout for a DSUB9 connector. In this case,
pin 3 is the Transmit Data (TXD) pin.
1. Plug the serial printer cable (not included) directly into the DSUB9 serial port
connector.
Pin No.
Pin Name
2
Transmit Data
Signal Level
RS-232
5
Signal Ground
RS-232
2
5
Front View
Figure B-1: Pin assignments for the COM1 serial port connector
SCALE
PRINTER
3
RXD
TXD
2
S. GND
5
7
S. GND
DSUB9F
DSUB25M
SCALE
PRINTER
3
RXD
TXD
2
S. GND
5
5
S. GND
DSUB9F
DSUB9M
FIGURE B-2: Cable Diagram for Scale to Dot
Matrix Printer
FIGURE B-3: Cable Diagram for Scale to
Thermal Printer
