Rice Lake 820i, Technical Manual

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820i Programmable HMI Indicator/Controller
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2.3.2 Load Cells
To attach cable from a load cell or junction box to the 820i :
1. Route the cable through the cord grip and ground the shield wire as described in Section 2.3.1 .
2. Remove load cell connector J7 or J8 from CPU board.
3. Wire the load cell cable from the load cell or junction box to the connector as shown in Table 2-1.
• For 6-wire load cell cable (with sense wires), remove jumpers JP1 and JP2 before reinstalling connector J7.
• For 4-wire installation, leave jumpers JP1 and JP2 on.
• For 6-wire load cell connections on dual-channel A/D cards, remove jumpers JP3 and JP4 for connections to J8.
Figure 2-2. Load Cell Connectors
4. When connections are complete, reinstall load cell connector on the CPU board header and use two cable ties to
secure the load cell cable to the inside of the enclosure.
2.3.3 Serial Communications
Communications ports on the 820i CPU board support PS/2-type remote keyboard, full duplex RS-232, 20 mA output, or RS-
485 communications at up to 115200 bps. Optional communications cards support USB, Ethernet, and fiber-optic connections
to the 820i .
To attach serial communications cables:
1. Route the cable through the cord grip and ground the shield wire as described in Section 2.3.1 .
2. Remove the serial connector from the CPU board
3. Wire cable to the connector.
4. Plug the connector into the header on the board.
5. Use cable ties to secure serial cables to the inside of the enclosure.
J7 or J8
Connector Pin Function
1 +SIG
2 –SIG
3 +SENSE
4 –SENSE
5 +EXC
6 –EXC
•For 6-wire load cell connections to connector J7, remove jumpers JP1 and
JP2.
•For 6-wire load cell connections to connector J8 (dual A/D boards), remove
jumpers JP3 and JP4.
Table 2-1. Load Cell Connector Pin Assignments
J7
LOAD CELL
CONNECTOR
J8
LOAD CELL
CONNECTOR
+SIG
–SIG
+SENS
–SENS
+EXC
–EXC
+SIG
–SIG
+SENS
–SENS
+EXC
–EXC