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Salter Brecknell 308BP User Manual

Page 22

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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.