Salter Brecknell S750 Series, Руководство по эксплуатации/настройке

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Page C-1
APPENDIX B: SERIAL PORT INFORMATION
B.1 COM1 MODES
B.1.1 FULL DUPLEX MODE
The Full Duplex Mode for COM1 provides a Demand serial transmission mode. The Demand mode
allows control from a host device, usually a PC, and can be activated by pressing
the PRINT key on the indicator’s front panel. Figure B-1 shows a suggested cable
diagram for interface to a PC. Figure B-2 shows the serial data format for the
Demand Mode.
INDICATOR PC
2 RXD RXD 2
TXD 3
S. GND 5
3 TXD
5 S. GND
6 DSR
4 DTR
8 CTS
DSUB9 DSUB9
FIGURE B-1. Cable Diagram for Indicator to IBM PC
<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
cu = cusotm unit
FIGURE B-2. Consolidated Controls Demand Mode