8
IQ4E/.. Installation Instructions - Mounting TG201338 Issue 4, 19-Jan-2016. Applies to v3.33.
IQ4E/..
Installation Instructions - Mounting
3 INsTAllATIoN
(continued)
13
Connect to xNC Interface
(../XNC variants only, if required)
Earthing (Grounding) & Isolation Requirements
If the IQ4E and other units on the bus are in the same cabinet
using the same power supply, each device must have a good
physical earth (ground) connection.
If the IQ4E and other units on the bus are in different cabinets
or use different power supplies (e.g. different UPS units), the
cabinets must be isolated from each other.
If the bus is likely to suffer from surge and grounding problems,
surge protection should be added. The isolator should be
connected to the earth (ground) of the nearest device, the 0V
of the isolator and the surge protector should be connected
together, and earth (ground) of the surge protector’s exposed
side (e.g. backbone bus) should be connected as directly
as possible to the surge ground or earth bond. Ensure that
terminators are fitted where indicated.
Connect using either the RS-485 Port, RS-232 Port (local
supervisor) or Ethernet Port.
RS-232 Port (local supervisor)
RS-485 Port
Ethernet Port (see step 7)
Rs-485 2-wire system
Note: For connection to an RS-485 4-wire system a suitable
2- to 4-wire converter will be required.
Rs-232 system
RJ12 / FFC68
Plug
Local
Supervisor
Port
1 - RX
2 - NC
3 - CTS
4 - RTS
5 - GND
6 - TX
TX
RX
RT
S
CT
S
G
ND
pin 1
Note: CTS and RTS connections may be connected differently
or not used - check the device data/installation sheet.
Note: When in use for XNC the local supervisor port cannot
be used to connect supervisory tools or devices.
Cabinet B
Backbone Bus
IQ4
Cabinet A
to more cabinets terminate at far end
Surge
Ground
or Earth
Bond
Isolating
Repeater
Isolating
Repeater
Surge Ground
or Earth Bond
Surge
Protection
Surge
Protection
terminate
at far end
to other devices
0V
0V
A
A
B
B
0V
A
B
0V
A
T
T
B
0V
A
B
0V
A
B
0V
A
B
0V
A
T
B
0V
A
B
RS-485
82
83
Terminal size:
0.14 to 2.5 mm
2
(22 to 12 AWG).
Terminal screw torque: 0.45 to 0.62 Nm (4 to 5.5 lb.in).
Number of Devices:
up to 32
0V
A B
0V
A B
RS-485
82
83
Bias switch ON
120 Ohm
terminator
Terminator
switch ON
Terminators:
The bus must be terminated at each end with
a resistor matched to the cable characteristic impedance (i.e.
±1%, ¼ Watt, range 100 to 130 ohms). If the IQ4E is at one end
of a 120 ohm cable, switch in its built-in terminator, otherwise
switch it out and fit a resistor at that end of the cable; the other
end must be terminated with a matching resistor.
Bias:
It is recommend that bias is applied at one location. The
IQ4E can be used to apply bias using its bias switch.
