Wiring Of Rs-485 Ports - Weidmuller Transclinic 16i+ User Manual

3.5 Wiring of RS–485 ports
CAUTION
Please pay attention when wiring RS-485 cables. A wrong installation can
create a lack of communications, but also, it can damage the equipment.
All the units shipped out from Weidmüller have their RS–485 ports
thoroughly tested right at the end of the production line. Weidmüller will not
cover under warranty Transclinic units that have their RS–485 transceiver
IC damaged due to wrong wiring and/or due to surges.
CAUTION
RS–485 wiring requires technical skills and tools different to those
of available to regular electricians. Please ensure that this step of the
equipment installation is performed by staff with the right skills and tools.
This user guide cannot be a replacement for field bus wiring experience
and Weidmüller cannot be made liable for any damages resulting from
improper wiring.
CAUTION
This equipment complies with the latest RS–485 and Modbus standards,
which are the official sources of information. The installation staff must
refer to the following documents, which always have priority over any
wiring recommendations given in this user guide:
• TIA/EIA–485–A: "Electrical characteristics of generators and receivers
for use in balanced multipoint systems"
• TIA TSB–89–A: "Application guidelines for TIA/EIA–485–A"
• "Modbus application protocol specification" v1.1b
• "Modbus over serial line specification and implementation guide" v1.02
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