MH-RC-MBS-1
User’s Manual r6.
3 EN
© 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
URL
Email
Phone
http://www.intesisbox.com
[email protected]
+34 938047134
6/23
2.2
Connection to the EIA-485 bus
Connect the EIA-485 bus wires to the plug-in terminal block of MH-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 120
Ω
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 XY bus between the interface and the AC indoor unit following the
instructions of the diagram. Screw each bare cable end in the corresponding XY
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.
By default, the interface is set to:
▪
Modbus Slave Address
➔
1
▪
Modbus baud rate
➔
9600 bps
These parameters can be modified from SW4 and SW3 DIP-Switches.
All other switch positions are set at low level (Off position ) by default.
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.
ON
ON
SW3
SW4
