Salter Brecknell 650 - Manual (Page 36)

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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 Salter
Brecknell cable – Model NMC-1.
Note : The COM1 serial port contains a non-standard pin-out for a DSUB9 connector.
Earlier 650 models may contain a standard pin-out 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
FIGURE B-2: Cable Diagram for Scale to external relays
5 SIG GND
6 TTL 1
7 TTL 2
8 TTL 3
DSUB9F