ICentral System One M200 Installation Manual - page 11
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MASTER TO ROOMS
Depending on the type of cable being used, rooms stations are wired as per the table above.
Where the Auxiliary function is required, this can be achieved in two ways:
1) By wiring the AUX terminal from each room to the AUX terminal at the master
Function is operated by pressing AUX followed function NUMBER
2) By configuring the system for double digit operation.
Function is operated by pressing 7 followed by function NUMBER
* Additional wiring of AUX terminals not required using this method.
Note 1: Option 2 is only available for systems using M200 or M250 master
Note 2: Room station only systems will require an additional Auxiliary Output PCB
Note 3: If option 1 is to be used but the number of conductors available are insufficient, the system can
be configured as 6wire allowing one of the spare conductors to be used as a seventh wire for
the auxiliary function.
MASTER TO DOORS
Door stations also are wired as per the table above however the MUS1 and MUS2 connections are
not applicable hence only six wires are required for general door station operation
For door stations fitted with a camera, the video signal can be transmitted using either the spare
Cat5 pair or a separate coaxial cable.
Note: Where a Cat5 pair is being used for the video signal, passive video baluns may be required at both ends of
the cable to achieve a good video image.
POWER SUPPLY
If a power supply is being used with a standard cable already attached, any required cable extension
should not be added to the end of the existing standard cable.
Where the existing cable length needs to be extended, the existing cable should be cut to a length of
only 10cm.
A heavy duty "Figure 8" cable should then be properly connected to the end of the 10cm cable from
the Power Supply and run to the Master (or the Room Station serving as a central connection point).
The total resistance of the power supply cable should not be greater than 0.4 divided by the total
system current.
EXAMPLE: Power Supply Cable Resistance (in ohms)
≤ 0.4 ÷ Total System Current (in amps)*
* where the total system current = sum of the peak current of all the stations on the system
As a guide for cable resistance, the typical return resistance of the standard wire attached to a
plugpack is approximately 0.17 ohm per metre.
The typical return resistance for "24 x 0.2 Figure 8" wire is approximately 0.05 ohm per metre.
EXAMPLE:
For a system with a maximum current draw of 2A, the maximum allowable power supply cable
resistance is 0.2 ohm (calculated by: 0.4 divided by 2A).
The maximum length for the standard plugpack cable in the above example would be approximately
1.2 meters (calculated by: 0.2 ohm divided by 0.17 ohm).
The maximum length for "24 x 0.20 Fig 8" cable in the above example would be approximately 4
meters (calculated by: 0.2 ohm divided by 0.05 ohm).