Communication Guide, ©ComAp – March 2014 78
IGS-NT Communication Guide 03-2014.pdf
Recommended CAN/RS485 connection
CAN bus connection
The bus has to be terminated by 120 Ohm resistors at both ends.
External units can be connected on the CAN bus line in any order, but keeping line arrangement (no
tails, no star) is necessary.
Standard maximum bus length is 200m for 32C CAN BUS MODE and 900m for 8C CAN BUS MODE
(setpoint in comms setings group)
Shielded cable has to be used, shielding has to be connected to PE on one side (controller side).
Recommended data cables: BELDEN (http://www.belden.com)
A) For shorter distances: 3105A Paired - EIA Industrial RS-485 PLTC/CM (1x2 conductors)
B) For longer distances: 3106A Paired - EIA Industrial RS-485 PLTC/CM (1x2+1 conductors)
C) In case of surge hazard: 3106A Paired - EIA Industrial RS-485 PLTC/CM (1x2+1 conductors)
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