Salter Brecknell 650 - Manual (Page 38)

38
Figure B-5: Pin assignments for the COM2 serial port connector
SCALE COMPUTER
2 RXD
TXD 3
S. GND 5 5 S. GND
DSUB9M DSUB9F
3 TXD
RXD 2
4
6
8 DTR
DSR
CTS
SCALE SCANNER
2 TXD
RXD 2
S. GND 5 5 S. GND
DSUB9M DSUB9M
FIGURE B-6: Cable Diagram for Scale to Computer FIGURE B-7: Cable Diagram for Scale to Scanner
B.2.2 FULL DUPLEX MODES FOR COM2
B.2.2.1 DEMAND MODE
The Demand mode allows control from a host device, usually a PC, and can be activated
by pressing the Print soft key. Figure B-8 shows the serial data format for the
Demand Mode. Table B-1 shows the recognized host commands.
<STX> <POL> xxxxx.xx <LB/KG> <GR/NT> <CR> <LF>
Polarity:
<SP> = Positive
"–" = Negative
Weight Data
Units:
lb = pound
kg = kilogram
Gross/Net:
GR = Gross
NT = Net
Start
Transmission
Carriage
Return
Line
Feed
<SP> <SP>
Space Space
pc = pieces
FIGURE B-8. Consolidated Controls Demand Mode