5
where: CR - carriage return (hex 0D)
D - decimal point (embedded where necessary)
ETX - end of text (hex 03)
m - mode, lower case (g=gross, n=net)
M - mode, upper case (G=gross, N=net)
P - polarity (space if positive, - if negative)
s - status, lower case (m=motion, e=entry - input in progress, c=over
capacity)
SS - status, upper case (CZ=center-of-zero, MO=motion, BZ=gross weight
below zero, ee=entry - input in progress, OC=over capacity)
uu - units, lower case (lb, kg, tn, etc.)
UU - units, upper case (LG, KG, TN, etc.)
xxxxxx - weight with leading spaces
zzzzzz - weight with leading zeros
^ - space
WEIGHT ON DEMAND
If the bi-directional serial has not been setup for continuous output, the 748P will respond to a
weight request (ENQ).
The host device (computer) sends:
ENQ - (hex 05)
The 748P will respond:
Sxxxxxx^UU^M^CC^CR - if no decimal point in weight display.
SxxxxxxD^UU^M^CC^CR - if decimal point in weight display.
S - sign (space if weight is positive or a “--” if weight is negative)
xxxxxx - six digits of weight with leading zeros suppression
D - decimal point embedded in weight (if decimal point selected during
calibration)
UU - weighing units (lb or kg)
M - weighing mode (“G” if displaying gross weight, “N” if displaying net
weight)
motion - space if there is no motion or an “M” if there is motion
CC - weight status (“OC” if weight exceeds scale capacity, “BZ” of the weight
is below zero, “MO’ if there is motion)
CR - carriage return (0Dhex)
BI-DIRECTIONAL SERIAL INTERFACE (Serial I/O)
The bi-directional serial interface for the 748P Weight Indicator is located on the printed circuit
board. Note that because of the number of signals involved, there is no terminal block for the bi-
directional serial interface. Rather, a 25-pin “D” connector has been provided for the interface. All
terminations to this interface must be made to a mating connector (Cardinal part no. 6610-2047)
plugged into the serial interface.
An RS232 20mA compatible bi-directional serial interface cable is
located on the back of the PC board and may be used for various
functions. It will accept serial commands* allowing the 748P to be
controlled remotely. Figure no. 5 illustrates the pin layout for this
connector.
* See SERIAL INPUT COMMANDS section for details.
Serial I/O
PIN 13
PIN 14
PIN 25
PIN 1
figure no. 5 - bi-directional interface
PIN NUMBER... FUNCTION
7 ............. GROUND
19 ............ GROUND
2 ............. Tx D
3 ............. Rx D
11 ............ Tx D RETURN
13 ............ Rx D
RETURN
10 ............ Tx D SRC
12 ............ Rx D SRC
23 ............ Tx D ACTIVE
25 ............ Rx D ACTIVE
24 ............ GROUND
9 ............. +5 VDC
6 ............. +5 VDC
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