Rice Lake 920i Installation Manual V3.05 - Manual (Page 15)

Installation 9
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 7. 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). The DB-9
connector pin assignments for Port 2 are shown in
Table 2-3; see Section 10.3 on page 105 for
information about the PS/2 keyboard interface.
Serial ports are configured using the SERIAL menu.
See Section 3.2.2 on page 33 for configuration
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.
Figure 2-3. Interface Board Connections
Figure 2-4. Interface Board, Top View
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
DB-9 Pin Signal
2 TxD
3 RxD
5 GND
7 CTS
8 RTS
Table 2-3. DB-9 Connector Pin Assignments
LCD Contrast
DIN-8 Connector for
PS/2 Remote Keyboard
DB-9 Connector
for Port 2 / J8
1
J1
J2
J3
J4
VR1
PB1
LCD
Contrast
DB-9 Connector
DIN-8
Connector
Setup
Switch
Optional
Keyboard Connector 1
CLK PWR RET DA
T
Ribbon Cable Connector
to CPU Boar
d
/ J8