Instructions

Intesis

INMBSDAI001R000

User’s Manual r3.8 EN

This information is subject to change without notice

URL https://www.intesis.com

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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

INMBSDAI001R000 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 P1P2 bus between the interface and the AC indoor unit following the

instructions of the diagram. Screw each bare cable end in the corresponding P1P2

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 Intesis interface and make sure it matches the

current installation’s parameters (see section 4.3).

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 Intesis interface requires to be connected to the AC unit (powered) to

start communicating.

SW3

SW4