Rice Lake 920i Installation Manual V1.05 - Manual (Page 11)

Installation 7
2.3.2 Load Cells
To attach cable from a load cell or junction box to an
installed A/D card, route the cable through the cord
grip and ground the shield wire as described in
Section 2.3.1 on page 6.
Next, remove connector J1 from the A/D card. The
connector plugs into a header on the A/D card (see
Figure 2-2). Wire the load cell cable from the load cell
or junction box to connector J1 as shown in Table 2-1.
Figure 2-2. Single-Channel A/D Card
If using 6-wire load cell cable (with sense wires),
remove jumpers JP1 and JP2 before reinstalling
connector J1. 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 J2.
When connections are complete, reinstall load cell
connector on the A/D card and use two cable ties to
secure the load cell cable to the inside of the
enclosure.
2.3.3 Serial Communications
The four communications ports on the 920i CPU
board support full duplex RS-232, 20 mA output, or
RS-485 communications at up to 115200 bps.
To attach serial communications cables, route the
cable through the cord grip and ground the shield wire
as described in Section 2.3.1 on page 6. Remove the
serial connector from the CPU board and wire to the
connector. Once cables are attached, plug the
connector into the header on the board. Use cable ties
to secure serial cables to the inside of the enclosure.
Table 2-2 shows the pin assignments for Ports 1, 3,
and 4. Port 2 provides DIN-8 and DB-9 connectors for
remote keyboard attachment of PS/2-type personal
computer keyboards (see Figure 2-3 on page 8). The
DB-9 connector pin assignments for Port 2 are shown
in Table 2-3 on page 8; see Section 10.3 on page 91
for information about the PS/2 keyboard interface.
Serial ports are conÞgured using the SERIAL menu.
See Section 3.2.2 on page 30 for conÞguration
information.
An optional dual-channel serial communications
expansion card, PN 67604, is also available. Each
serial expansion card provides two additional serial
ports, including one port that supports RS-485
communications. Both ports on the expansion card
can support RS-232 or 20mA connections.
A/D Card
Connector Pin Function
1 +SIG
2 –SIG
3 +SENSE
4 –SENSE
5 +EXC
6 –EXC
• For 6-wire load cell connections to connector J1, remove
jumpers JP1 and JP2.
• For 6-wire load cell connections to connector J2 (dual A/D
cards), remove jumpers JP3 and JP4. 2.
Table 2-1. A/D Card Pin Assignments
SIG + SIG –
SEN + SEN – EXC + EXC –
J1
JP2 JP1
Connector Pin Signal Port
J11 1 GND 1
2 RS-232 RxD
3 RS-232 TxD
J9
1 GND / –20mA OUT
3
2 RS-232 RxD
3 RS-232 TxD
4 +20mA OUT
J10 1 GND / –20mA OUT 4
2 RS-232 RxD
3 RS-232 TxD
4 +20mA OUT
5 RS-485 A
6 RS-485 B
Table 2-2. Serial Port Pin Assignments