APPENDIX B: SERIAL PORT INFORMATION
B.1 SERIAL PORT MODES
B.1.1 FULL DUPLEX MODE
The Full Duplex Mode provides a Demand serial transmission mode and is selected by
setting A3 to “d” and A6 to “0”. 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
Start
Transmission
NT = Net
Carriage
Return
Line
Feed
<SP>
<SP>
Space
Space
pc = pieces
pcs = pieces*
FIGURE B-2. Consolidated Controls Demand Mode
Appendix B
