3
All of the terminations to
the desktop enclosure
version of the 748 are
made on the rear panel
via “D” style connectors.
See figure no. 2 to see
the identification of each
of these connectors.
LOAD CELL CONNECTION
CAUTION! Disconnect any external load cell power supply before connecting load cells to
the instrument. Failure to do so will result in permanent damage to the instrument.
The load cell cable is terminated via a 9-pin connector on the rear panel. Figure no. 3 shows the pin
identification for the connector. Make certain that the pins are correctly identified before soldering a
wire to them. NOTE!! If you use sense leads in your load cell installation (as in motor truck scales),
jumpers J1 and J3, located on the PC board, should be disconnected or placed on one pin only. If
you do not use sense leads, jumpers J1 and J3 must be installed to connect the sense leads to the
excitation (refer to figure no. 11). Make certain that the connector retaining screws are used to hold
the connector securely to the rear panel.
REMOTE INPUT
PWC OUTPUT
LOAD CELL
BCD OUTPUT
ANALOG OUTPUT
PRINTER OUTPUT
SERIAL I/O
18 VCD
0.8 A
figure no. 2 - connector identification
PIN 5
PIN 1
PIN 9
PIN 6
MATING CONNECTOR
CONNECTOR ................DE-9P
CONNECTOR SHELL....DE-24657
SCREW LOCK ...............DE-20419
figure no. 3 - load cell
connection
Load Cell
Standard Printer Output Connector
20mA Current Loop Pin Definitions
(indicator has active end)
20mA 10 RX
GND 11
Internal
Circuitry
Printer
Conn.
Peripheral Device
Passive End
PIN NUMBER FUNCTION
1.................+ EXCITATION
9.................+ SENSE
7.................+SIGNAL
2.................- SIGNAL
4.................- SENSE
6.................- EXCITATION
5.................SHIELD
Standard "Printer Connector RS-232C Pin Definitions:
TXD 2
*CTS 5
SIG GND 7
Part No. Vendor Part No.
6610-2047 DB-25P CONNECTOR
6610-2218 BACK SHELL
Mating Connector
PIN 13
PIN 14
PIN 25
PIN 1
PRINTER OUTPUT CONNECTION
If a printer is used, it may be connected to the printer output connector located on the rear panel.
Figure no. 4 shows the connections for both RS232 compatible data and 20 mA current loop
interfaces for the printer output.
figure no. 4 - printer output connection
NOTE! *RS232 CTS handshake input is enabled during calibration or setup review.
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