Fidelity Electronics FM180S - Connecting Other Devices; Connection with Weighing Platform or Load Cell Junction Box; Connecting RS232 to Computer

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4.5 Connecting Other Devices
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6
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4.5.1 Connection with Weighing Platform or Load Cell Junction Box
Connect this instrument with a weighing platform (load cell) through load cell
connector located at the back according to the below pin assignment table.
Note: - If a 4-wire load cell or junction box is used, short-circuit pin 1&2 and
pin 3&4. Otherwise, this instrument will not work.
Load Cell Connector Pin Assignment
LOAD CELL
CONNECTOR PIN #
ASSIGNMENT
1
EXCITATION +ve
2
SENSE +ve
3
EXCITATION -ve
4
SENSE -ve
5
SIGNAL +ve
6
SIGNAL -ve
7
GROUND
4.5.2 Connecting RS232 To Computer
RS232 TERMINAL ON
BOARD
COM PORT ON COMPUTER
(DB9)
(DB25)
RXD
3 = TXD
3 = TXD
TXD
2 = RXD
2 = RXD
GND
5 = GND
7 = GND
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Turn this instrument off and cut off power before making any connections or disconnections.
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TTL relay and TTL communication are not OIML approved function
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It is highly recommended that all inside-housing connections to be done by dealer. Contact
your dealer for detailed connection information if required.