Rice Lake 920i USB Installation Manual V5.05 - Manual (Page 17)

Installation 11
2.3.4 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 2.3.2 on page 9. 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 ke yboards. The DB-9 connector pin
assignments for Port 2 are shown in Table 2-3; see
Section 11.3 on page 116 for information about the
PS/2 keyboard interface.
Table 2-2. Serial Port Pin Assignments
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
Serial ports are configured using the SERIAL menu.
See Section 3.2.2 on page 37 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.
LCD Contrast
DIN-8 Connector for
PS/2 Remote Keyboard
DB-9 Connector
for Port 2 / J8
1
Figure 2-4. Serial Interface Board Connections
Table 2-3. DB-9 Connector Pin Assignments
DB-9 Pin Signal
2 TxD
3 RxD
5 GND
7 CTS
8 RTS
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 Board / J8
Figure 2-5. Interface Board, Top View
Table 2-4. J4 (Optional Keyboard Connector)
Pin Assignments
J4 Pin Color Signal
1 Brown Clock
2 Clear +5v
3 Yellow GND
4 Red Data