Instructions

Intesis
TM
INMBSPAN001I100
User’s Manual r1.2 EN
© HMS Industrial Networks S.L.U - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
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2. Connection
The interface comes with a specific cable and connectors to establish direct connection with the
AC indoor unit. It comes as well with a plug-in terminal block of 2 poles to establish direct
connection with the Modbus RTU EIA-485 network.
2.1 Connect to the AC indoor unit
To connect the INMBSPAN001I100 interface with the AC indoor unit you must follow these
steps:
Disconnect Mains Power from the AC unit. Open the front cover of the indoor unit to have
access to the electronic circuit. Once you arrive at the electronic circuit, locate the socket
connector marked as CN-CNT.
Take the cable that comes with the interface, insert one of its connectors (the one installed in
the shortest uncovered part) into the socket of the INMBSPAN001I100, and the other connector
(the one installed in the largest uncovered part) to the socket CN-CNT of the AC unit's
electronic circuit. You can place the INMBSPAN001I100 inside or outside the AC indoor unit
depending on your needs. Remember that the INMBSPAN001I100 must also be connected to
the Modbus RTU EIA-485 network. Close the AC indoor unit's front cover again to finish the
connection.
Do not modify the length of the cable supplied with the interface, it may affect the correct
interface´s operation.
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
INMBSPAN001I100 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).
CN-CNT
AC indoor unit
Electronic control board
200 mm / 7.9”
40 mm / 1.6”
Connection cable
provided with the
interface
90 mm / 3.5”
Modbus RTU
EIA-485
Bus
EIA485
A B
AC Unit
53 mm / 2.1”
Use this hole to
attach the cable
using the staple
and the screw
provided with the
interface
For wall
mounting,
extract the
upper and
lower staples
until you listen
the "click".
Fixing screw