Connecting The Load Cell Cable; Connecting Communications Cables - Rice Lake IQ plus 310A Installation Manual

2.5 CONNECTING LOAD CELL CABLE
The load cell cable connects to a plug-in terminal block (J3) on the main circuit board. When
shipped, the IQplus 310A is configured for 4-wire load cell connections (JP1 and JP2 on main
board are jumpered). If sense leads are to be used in a 6-wire connection, remove these two
jumpers. The load cell cable should be retained at its original length for correct temperature
compensation. Make connections at terminal J3 according to Figure 6. Tighten the cable fitting.
2.6 CONNECTING COMMUNICATION CABLE
The serial communications cable connects to a plug-in terminal block at J4 on the main
circuit board according to Figure 7. Use only one shielded cable for all signal connections,
including the digital inputs if used. Remove the factory installed hole plug from the fitting
and install the communications cable as follows:
(1) Loosen the cable fitting and insert the communications cable far enough to reach J4.
Prepare the cable wires and shield as required. Connect them to J4 on the main
circuit board. See Figure 8 for location of J4.
(2) Install a cable tie as shown in Figure 3 and tighten the cable fitting.
J4 EDP Port
Pin RS232
1 TxD (Transmit Data)
2 Signal GND
3 RxD (Receive Data)
4 – – – – – –
5 – – – – – –
6 – – – Digital Input #2 – Functions as programmed – – –
7 – – – Digital Input #1 – Functions as programmed – – –
J3 Load Cell
1 + Signal
2 – Signal
3 + Sense
4 – Sense
5 Shield (Ground)
6 + Excitation
7 – Excitation
FIGURE 6 – LOAD CELL CONNECTIONS
Printer Port
RS232
– – – – – –
Signal GND
– – – – – –
– – – – – –
TxD (Transmit Data) – – – – – –
FIGURE 7 – COMMUNICATIONS CONNECTIONS
Printer Port
20-mA CL
– – – – – –
20 mA GND
– – – – – –
20 mA (+)
7