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i-MARK 2 / i-MARK 3
USER
MANUAL
VISIBILITY DELIVERED.
PAGE 36 OF 55
7.2
Electrical Installation
7.2.1
Safety Instructions
The mains power supply must be equipped with an easy and safely accessible remote emergency
cut-off switch.
The mains power supply must be equipped with an over-current protective device that limits
current to 16 A.
The power supply circuit must comply with the requirements of the SELV circuits (see EN 60950).
The signal circuits must comply with the requirements of the SELV circuits (see EN 60950).
The RS422/i-BUS signal circuits must comply with the requirements of the TNV-1 circuits (see EN
60950).
Use a ferrite rod for all cables and place it close to the units.
Screened cable must be used for all signal cabling and the DC power supply. Only then is the
required EMC achieved.
The device uses RS422 levels on its RX and TX Pins, although Ethernet jack/plugs mechanically
fit, the device is not Ethernet compatible!
Industry standard cat 5 straight patch cables can be used to daisy chain the devices
Glossary
SELV
Safety Extra Low Voltage – Protective measure against dangerous body currents.
Protective first voltage, circuit not floating.
TNV-1
Telecommunication Network Voltage
EMC Electromagnetic
Compatibility
RxD Receive
Data
TxD Transmit
Data
7.2.2
Useful Note
Where an i-MARK 2/3 is mounted inside a roof, a wall, floor or any location where future access is
restricted or impeded, then it is recommended to connect the i-MARK to a regular wall-mounted LAN
socket conveniently located via std. patch cable in order to gain access to the i-BUS interface
afterwards.
7.2.3
Position of Ports