HMS Networks Intesis EIA-485, Руководство пользователя, Страница: 6 / 20

Intesis TM INMBSMIT001I000
User’s Manual r22 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 INMBSMIT001I000 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
CN105.
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 INMBSMIT001I000, and the other connector
(the one installed in the largest uncovered part) to the socket
CN105 of the AC unit's electronic
circuit. You can place the INMBSMIT001I000 inside or outside the AC indoor unit depending on
your needs. Remember that the INMBSMIT001I000 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 of INMBSMIT001I000 (the one with
two poles) 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).
CN105
AC indoor unit
Electronic control board
200 mm / 7.9”
40 mm / 1.6”
Connection cable
provided with the
interface
90 mm / 3.5”
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
Modbus RTU
EIA-485
Bus