Salter Brecknell 308BP User Manual
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APPENDIX B: SERIAL PORT INFORMATION
B.1 SERIAL PORT HARDWARE
The 308-BP series scale comes standard with a full duplex, RS-232 port designed for connection to a PC,
scoreboard or serial printer. Figure B-1 shows the serial port pin assignments for the scale’s
female DSUB9 connector. Refer to Figures B-2 and B-3 for some suggested cable diagrams.
1. Plug the serial printer or computer communication cable (not included) directly into the scale’s
DSUB9 serial port connector.
Pin No.
Pin Name
2
Receive Data
3
Transmit Data
Signal Level
RS-232
RS-232
5
Signal Ground
RS-232
2
3
5
Front View
Figure B-1: Pin assignments for the DSUB9 serial port connector
SCALE
PC
2 RXD
RXD 2
TXD 3
S. GND 5
3 TXD
5 S. GND
6 DSR
4 DTR
8 CTS
DSUB9
DSUB9
SCALE
PRINTER
3 RXD
TXD 3
S. GND 5
7 S. GND
DSUB9
DSUB25
FIGURE B-2. Cable Diagram for Scale to PC
FIGURE B-3. Cable Diagram for Scale to Printer
B.2 SERIAL PORT MODES
B.2.1 DEMAND MODE
The scale provides a full duplex, demand serial transmission mode. This mode is configured in the
A3 sub-menu of the User Menu. See Chapter 5 for more information. The demand
mode allows control from a host device, such as a PC, and can also be activated by
pressing the PRINT key on the scale’s front panel. Figure B-2 shows a suggested
cable diagram for interface to a PC.
Demand mode is also used when interfacing to a serial printer. Figure B-3 shows a suggested
cable diagram for interface to a serial printer.