Connection; Connect To The Ac Indoor Unit; Connection To The Eia-485 Bus - Intesis IntesisBox FJ-AC-MBS-1 User Manual

ModBus RTU – Fujitsu
®
IntesisBox

2 Connection

The interface comes with cable + connectors for direct connection to the AC indoor unit, and with a plug-in terminal
block of 3 poles for connection to a Modbus RTU EIA-485 network.

Connect to the AC indoor unit

The FJ-AC-MBS-1 connects directly to the indoor unit internal control board. In the control board locate the socket
connector marked as CN65.
CN65
Electronic control board

Connection to the EIA-485 bus

Connect the EIA-485 bus wires to the plug-in terminal block of FJ-AC-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.
© 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
Connection cable
provided with the
interface
AC indoor unit
200 mm / 7.9"
Fixing screw
Figure 2.1 FJ-AC-MBS-1 connection diagram
Use this hole to
attach the cable
using the staple and
the screw provided
with the interface
SW2
B A SG
EIA485
®
IntesisBox
FJ-AC-MBS-1
40 mm / 1.6"
AC Unit
SW1
53 mm / 2.1"
URL
EmailP
hone +34 938047134
User Manual r1.0 EN
ModBus RTU
EIA-485
Bus
SW3
90 mm / 3.5" For wall
extract the upper and
lower staples until you
listen the "click".
6/21
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mounting,