B.2 COM2 SERIAL PORT
B.2.1 CONNECTING THE SERIAL DEVICE
The COM2 serial port is a full duplex RS-232 port designed for connection to one of the
following:
•
Computer
•
Remote display
•
Transcell TC-100, TC-200 or PBS Series scale
•
Scanner
Figure B-3 shows the serial port pin out. To connect to a PC-type computer, use the optional
Transcell cable – Model NMC-1. To connect to a Transcell scale, use the optional Transcell
cable – Model NMC-2.
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
9
Scanner Power
+5 VDC
2
3
5
Front View
9
Figure B-3: Pin assignments for the COM2 serial port connector
B.2.2 FULL DUPLEX MODES FOR COM2
B.2.2.1 CONTINUOUS MODE
The Continuous mode is used to interface to computers, scoreboards and other remote
devices requiring constant data updating. The transmission occurs at the end of each
display update. Set A3 to “3” to get this output. Figure B-4 shows the serial data format for
the Continuous Mode. Table B-1 shows the recognized host commands.
<STX> <POL> xxxxx.xx
<L/K> <G/N>
<STAT> <CR> <LF>
Polarity:
<SP> = Positive
"–" = Negative
Weight Data
Units:
L = pound
K = kilogram
Gross/Net:
G = Gross
N = Net
Start
Transmission
Carriage
Return
Line
Feed
Status:
<SP> = Valid
M = Motion
O = Over/under range
C = custom unit
P = pieces
FIGURE B-4. Consolidated Controls Continuous Mode
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