Connection To The Eia-485 Bus; Quick Start Guide - IntesisBox FJ-RC-MBS-1 User Manual

2.2 Connection to the EIA-485 bus

Connect the EIA-485 bus wires to the plug-in terminal block (the one of two poles) of FJ-RC-
MBS-1 and keep the polarity on this connection (A+ and B-). Make sure that the maximum
distance to the bus is 1,200 meters (3,937 ft). Loop or star typologies are not allowed in the
case of the EIA-485 bus. A terminator resistor of 120Ω must be present at each end of the bus
to avoid signal reflections. The bus needs a fail-safe biasing mechanism (see section 4.6 for
more details).

3. Quick Start Guide

1. Disconnect the air conditioning from the Mains Power.
2. Attach the interface next to the AC indoor unit (wall mounting) following the instructions
of the diagram below or install it inside the AC indoor unit (respect the safety
instructions given).
3. Connect the BWR bus between the interface and the AC indoor unit following the
instructions of the diagram. Screw each bare cable end in the corresponding BWR
terminals of each device.
4. Connect the EIA-485 bus to the connector EIA485 of the interface.
5. Close the AC indoor unit.
6. Check the DIP-Switch configuration of the IntesisBox interface and make sure it matches
the current installation's parameters (see section 4.3).
By default, the interface is set to:
▪
▪
These parameters can be modified from SW4 and SW3 DIP-Switches.
All other switch positions are set at low level (Off position
NOTE: All changes on the DIP-Switch configuration require a system power cycle to be
applied.
7. Connect the AC system to Mains Power.
IMPORTANT: The IntesisBox interface requires to be connected to the AC unit
(powered) to start communicating.
© Intesis Software S.L.U. - All rights reserved
This information is subject to change without notice
IntesisBox ® is a registered trademark of Intesis Software SLU
FJ-RC-MBS-1
Modbus Slave Address  1
Modbus baud rate  9600 bps
User's Manual r1.9 EN
SW4
SW3
ON ON
) by default.
URL http://www.intesisbox.com
Email info@intesisbox.com
Phone +34 938047134
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