User's Manual

i-MARK Installation and Hardware Manual
Page 13 of 22
3.2 Electrical Installation
3.2.1 Safety Instructions
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).
Use a ferrite core or rod for all cables and place it close to the units.
A screened cable must be used for the 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.
EMC Electromagnetic Compatibility
RxD Receive Data
TxD Transmit Data
3.2.2 Maximum Overall Cable Runs of Daisy Chain Cabling
This tables is valid for Cat 5 cabling with gauge diameters of AWG24.
# of i-MARKs Length Remark
1 300 m One 24V
2 600 m One 24V
3 400 m One 24V
4 250 m One 24V
5 200 m One 24V
8 100 m One 24V
8 1000 m GND potential free power supplies at every i-MARK
3.2.3 Position of Ports
According to the table before, the supply must only be connected in order to operate at long cables
runs of the daisy chain.