Energy Guide

04.24.13 Rev. 0.3a 9
INSTRUCTION FOR SERIAL CONNECTION RS232 AND/OR RS485
NOTES ON THE WIRING: wrong wiring can damage both the controller and other devices connected to the
serial port.
Be careful to the following technical points below:
1. Use flexible, twisted pair, earth shielded cable, type 22 AWG.
2. The total length of the net has to be no more than:
- 5 m for serial connection through RS232
- 400 m for serial connection through RS485
3. In serial connection RS485 the maximum devices connectable are 32 units.
NOTES ON INSTALLATION
• The signal wire must be placed in electrical trunk separated from power cables or dangerous cables like the wires
of lighting and so on….
• Don’t place the signal wires near power bus-bar, lamps, transformers and high frequency antenna.
• The signal cable must be minimum 2 m far from heavy inductive load (motors, inverters and control / patch
board).
• Don’t pull the cables by strength over 12 Kg; stronger strength can damage the wires and reduce the signal
transmission on the line.
• Don’t twist, knot, crush and fray the wires.
• Use always a single cable without cut it to make the connection between two devices.
• Pay attention to wire stripper.
• To be sure that the connection is well done, sign the position of terminal block with the colour of the wire.