Guidelines for rs-485 wiring, Cable grip and cable specifications, E-m-hf5-v2_12 – ROTRONIC HF5 User Manual
Page 14: 2 guidelines for rs-485 wiring, 3 cable grip and cable specifications
E-M-HF5-V2_12
Rotronic AG
Bassersdorf, Switzerland
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HygroFlex HF5 Humidity Temperature
Transmitters: User Guide
Instruction Manual
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© 2009-2013; Rotronic AG E-M-HF5-V2_12
Bus signals such as RS485
Data signals for PCs, printers etc.
shielded analog inputs
unshielded direct current (<= 60V)
shielded process signals (<= 25 V)
unshielded alternate current (<= 25V)
coaxial cables for CRT monitors
in common bundles or channels / conduits
direct current from 60 V to 400 V
(unshielded)
alternate current from 25V to 400 V
(unshielded)
in separated bundles or channels /
conduits, without minimum distance
direct and alternate current > 400 V
(unshielded)
Telephone lines
lines leading into EX-rated areas
in separated bundles or channels /
conduits, without minimum distance
Lightning protection
Cabling in areas with a risk of lightning requires a lightning protection. For cabling underground in between
buildings, we recommend the use of special fiber optic cables. If this is not possible, use copper cables that
are suitable for underground installation.
6.2 Guidelines for RS-485 wiring
See document E-DV04-RS485.01: RS485 Network Installation and Start-up Guidelines
6.3 Cable grip and cable specifications
Depending on the model, the HF5 is supplied either with one or two M16 sealing cable grips or with one or two
½” conduit adapters. The M16 cable grip provides effective sealing only with cables having the proper outside
diameter. Preferably, use a cable with an outside diameter of 6 to 7 mm (0.236 to 0.275 inch) with 18 AWG
wires.