Instruction Manual

FlintWeigh II IPC Technical Manual, Rev. 1.06 November 2011
Page 9 of 36
4.1.1. Connector for Standard Load Cells
The connectors J1 and J2 can be used for connecting standard load cells in 4– or 6–wire technique.
Hint: If 4–wire technique will be used, then pin no. 1 and no. 2 as well as pin no. 4 and no. 5 have to be short-
circuited.
It is mandatory to interconnect the shield of the connection cable with one of the shield connector pins
(pin no. 3, 6 or 9).
Pin no. Signal Description
1
+ Excitation Excitation, positive pol
2
+ Sense Sense, positive pol
3
Shield Shield connector for load cell connection cable
4
– Sense Sense, negative pol
5
– Excitation Excitation, negative pol
6
Shield Shield connector for load cell connection cable
7
+ Signal Measurement signal, positive pol
8
– Signal Measurement signal, negative pol
9
Shield Shield connector for load cell connection cable
Tab. 4.1: Plug connector for standard load cells (J1 / J2)
4.1.2. Connector for Digital Load Cells and Digital I/O
The connector J3 provides a RS485 bus interface and a power supply for the digital load cells.
IMPORTANT: It is mandatory to leave pin no. 2 unconnected, if the digital load cells are powered externally,
see also chapter 4.3.
The connector also provides the digital I/O interfaces,see chapter 4.4.
Pin no. Signal Description
1
GND
Power supply
+12V DC / 450 mA
2
+12V DC
3
RS485 A RS485 bus – non-inverted Signal
4
RS485 B RS485 bus – inverted signal
5
IO - GND Digital I/O – signal ground
6
IO - In1 Digital I/O – input
7
IO - Out1 Digital I/O – output 1
8
IO - Out2 Digital I/O – output 2
Tab. 4.2: Plug connector for digital load cells and digital I/O (J3)
F
ig. 4.3: Connector pin assignment J3