Instructions

Intesis

Modbus RTU – Fujitsu User Manual r1.3 EN

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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 INMBSFGL001I000 connects directly to the indoor unit internal control board. In the control board locate the

socket connector marked as CN65.

Figure 2.1 INMBSFGL001I000 connection diagram

Connection to the EIA-485 bus

Connect the EIA-485 bus wires to the plug-in terminal block of INMBSFGL001I000 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.

CN65

AC indoor unit

Electronic control board

200 mm / 7.9”

40 mm / 1.6”

Connection cable

provided with the

interface

90 mm / 3.5”

53 mm / 2.1”

Use this hole to

attach the cable

using the staple and

the screw provided

with the interface

Fixing screw

ModBus RTU

EIA-485

Bus

AC Unit

B A SG

EIA485

For wall mounting,

extract the upper and

lower staples until you

listen the "click".

SW1

SW2

SW3