Salter Brecknell 630 - Manual (Page 21)

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APPENDIX B: SERIAL PORT INFORMATION
B.1 COM1 SERIAL PORT
B.1.1 CONNECTING THE SERIAL DEVICE
The COM1 serial port is a full duplex RS-232 port designed for connection to one of the following
devices:
• Serial receipt printer (dot matrix)
• Computer
• Remote display
• 610 Scale or 304-BP Precision Balance (to receive APW)
Figure B-1 shows the serial port pinout. Figure B-2 shows a suggested cable diagram for a serial
printer. Figure B-3 shows a suggested cable diagram for a PC-type computer. The
cable shown in Figure B-3 is a standard Transcell cable – Model NMC-1.
1. Plug the serial device cable (not included) directly into the 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 COM1 serial port connector
SCALE PRINTER
3 RXD
TXD 2
S. GND 5 7 S. GND
DSUB9M DSUB25M
SCALE COMPUTER
2 RXD
TXD 3
S. GND 5 5 S. GND
DSUB9M DSUB9F
3 TXD
RXD 2
4
6
8 DTR
DSR
CTS
FIGURE B-2: Cable Diagram for Scale to Dot Matrix
Printer
FIGURE B-3: Cable Diagram for Scale to Computer