Rice Lake iQUBE2 Digital Diagnostic Junction Box User Manual
Page 14
10
iQUBE
2
Installation Manual
Selecting Communication Type for Port 1
When changing communication protocols on Port 1, follow the below procedure.
1. Remove power from the iQUBE
2
.
2. Place the
S2
switches in the proper position for the communication type to be used (
Off, Off
for 485/422 Half-
Duplex mode).
3. Place SW1 in the
CFG
position.
4. Apply power to the iQUBE
2
.
5. Place SW1 in the
OFF
position.
Communications Option Cards
Table 2-6 shows communications option cards available for the iQUBE
2
. Communications option cards are
installed in the J9 connector of the primary CPU board for the iQUBE
2
system. All option cards use Port 3 except
for wireless Ethernet, which uses Port 2.
Communications Cable Distance Limitations
The maximum cable lengths that can be used for various communications types depend on a number of factors.
These include output impedance of the transmitter; electrical noise in the environment; cable capacitance, wire
gauge, termination, shielding, and baud rates.
Given that these and other factors will affect the maximum usable cable length, the following distances can be used
as a general guide for iQUBE
2
communications cabling:
Data rate decreases with distance. See Table 2-8.
Ethernet port is not suitable for connection to circuits used outside the building and is subject to lightning or
power faults.
920i
Serial Option Board
J2 Connector
iQUBE
2
J7 Connector
RS-485 Signal
Pin
Pin
RS-485 Signal
RET
6
1
GND1
AR+
1
4
Tx+
AR-
2
5
Tx-
AT-
3
3
Rx-
AT+
4
2
Rx+
Table 2-5. 4-wire RS-485 connections for
920i
host
Option
PN
Fiber-optic interface card
77143
Ethernet interface card IEEE 802.3
77142
Wireless Ethernet card IEEE 802.11g
108671
USB interface card
93245
Serial interface card
108579
Table 2-6. Communications Option Cards
Cable Type
Distance
RS-232
50 ft (15 m) @ 19,200 Baud (10 ft @ 115,200 Baud)
RS-485
1000 ft (300 m) twisted pair cable @ 115,200 Baud
Fiber-optic
375 ft (114 m)
Ethernet Cat5
330 ft (100 m)
USB
16.5 ft (5 m)
802.11g
330 ft (100 m) under optimal conditions
Table 2-7. Communication Cable Limitations
Note