IntesisBox FJ-RC-MBS-1 User manual

IntesisBox®
FJ-RC-MBS-1 v.2.5
Modbus RTU (EIA-485) Interface for Fujitsu air conditioners.
User Manual
Issue Date: 12/2017
r1.9 EN
Order Codes:
FJ-RC-MBS-1: Modbus RTU Interface for Fujitsu air conditioners

FJ-RC-MBS-1
User’s Manual r1.9 EN
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© Intesis Software S.L.U. 2017. All Rights Reserved.
Information in this document is subject to change without notice. No part of this publication
may be reproduced, stored in a retrieval system or transmitted in any form or any means
electronic or mechanical, including photocopying and recording for any purpose other than the
purchaser’s personal use without the written permission of Intesis Software S.L.U.
Intesis Software S.L.U.
Milà i Fontanals, 1 bis
08700 Igualada
Spain
TRADEMARKS
All trademarks and tradenames used in this document are acknowledged to be the copyright of
their respective holders.

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INDEX
1. Presentation .......................................................................................................... 4
2. Connection............................................................................................................ 5
2.1 Connect to the AC indoor unit............................................................................... 5
2.2 Connection to the EIA-485 bus ............................................................................. 6
3. Quick Start Guide................................................................................................... 6
4. Modbus Interface Specification ................................................................................ 7
4.1 Modbus physical layer.......................................................................................... 7
4.2 Modbus Registers................................................................................................ 7
4.2.1 Control and status registers ........................................................................... 7
4.2.2 Configuration Registers.................................................................................. 9
4.2.3 Considerations on Temperature Registers ...................................................... 10
4.3 DIP-switch Configuration Interface ...................................................................... 13
4.4 Implemented Functions ..................................................................................... 16
4.5 Device LED indicator ......................................................................................... 16
4.6 EIA-485 bus. Termination resistors and Fail-Safe Biasing mechanism ...................... 17
5. Mechanical and electrical features .......................................................................... 18
6. List of supported AC Unit Types. ............................................................................ 19
7. Error Codes ......................................................................................................... 20
7.1 Intesis Codes....................................................................................................... 20
7.2 RAC and VRF J-II / V-II / VR-II series..................................................................... 20
7.3 VRF V / S / J Series............................................................................................... 23

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1. Presentation
The FJ-RC-MBS-1 interfaces allow a complete and natural
integration of Fujitsu air conditioners into Modbus RTU (EIA-
485) networks.
Reduced dimensions. 93 x 53 x 58 mm
3.7” x 2.1” x 2.3”
Quick and easy installation.
Mountable on DIN rail, wall, or even inside the indoor unit of AC.
•External power not required.
•Direct connection to Modbus RTU (EIA-485) networks. Up to 63 FJ-RC-MBS-1 devices can be
connected in the same network.
FJ-RC-MBS-1 is a Modbus slave device.
•Direct connection to the AC indoor unit. Up to 16 AC indoor units can be connected to FJ-RC-
MBS-1, controlling them as one (not individually).
•Configuration from both on-board DIP-switches and Modbus RTU.
•Total Control and Supervision.
•Real states of the AC unit's internal variables.
•Allows simultaneous use of the AC’s remote controls and Modbus RTU.
* Up to 63 IntesisBox devices can be installed in the same Modbus RTU bus. However, depending on the configured speed, the
installation of Modbus Repeaters may be required
•SCADA
•PLC
•DDC
•BMS
•HMI
•Controller
•etc
Up to 63
AC indoor
units*
Modbus RTU
EIA-485 network
Modbus RTU
Master
device
FJ-RC-MBS-1
FJ-RC-MBS-1
FJ-RC-MBS-1

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2. Connection
The interface comes with a plug-in terminal block of 3 poles 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
The FJ-RC-MBS-1 connects directly to the Fujitsu BWR Bus, which is not provided within the
interface. Depending on which controllers are available, the recommended connection’methods
are the following ones (details in Figure 2. 1):
•Wired remote control available. Connect the gateway as Slave in parallel with the
wired Remote Controllers (Controller acts as Master).
•No remote control available Connect the gateway directly to the BWR bus of the
indoor unit as Master when there is no Fujitsu Remote Controller.
Maximum BWR bus length is 500 meters / 1,640.42 ft. The bus has no polarity sensitivity.
IntesisBox®
FJ-RC-MBS-1
MODBUS RTU
EIA-485
Bus
EIA485
A+ B-
53 mm / 2.1”
Max. 500 m / 1,640.42 ft
AC Indoor Unit
IntesisBox®
FJ-RC-MBS-1
MODBUS RTU
EIA-485
Bus
EIA485
A+ B-
B W R
AC Unit
53 mm / 2.1”
For wall mounting
extract the upper
and down staples
until you hear the
"click".
R W B
Max. 500 m / 1,640.42 ft
Remote Controller
GND (3) B
Data (2) W
Power (1) R
90 mm / 3.5”
AC Indoor Unit
Internal electronic
control board
Internal electronic
control board
B W R
AC Unit
GND (3) B
Data (2) W
Power (1) R
90 mm / 3.5”
Figure 2. 1 FJ-RC-MBS-1 connection diagram

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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 FJ-RC-
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 120Ωmust 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 BWR bus between the interface and the AC indoor unit following the
instructions of the diagram. Screw each bare cable end in the corresponding BWR
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 IntesisBox 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 IntesisBox interface requires to be connected to the AC unit
(powered) to start communicating.
ON
ON
SW3
SW4

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4. Modbus Interface Specification
4.1 Modbus physical layer
FJ-RC-MBS-1 implements a Modbus RTU (Slave) interface, to be connected to an EIA-485 line.
It performs 8N2 communication (8 data bits, no parity and 2 stop bit) with several available
baud rates (2400 bps, 4800 bps, 9600 bps -default-, 19200 bps, 38400 bps, 57600 bps, 76800
bps and 115200 bps). It also supports 8N1 communication (8 data bits, no parity and 1 stop
bit).
4.2 Modbus Registers
All registers are type “16-bit unsigned Holding Register” and they use the Modbus big endian
notation.
4.2.1 Control and status registers
Register Address
(protocol address)
Register Address
(PLC address)
R/W
Description
0
1
R/W
AC unit On/Off
▪0: Off
▪1: On
1
2
R/W
AC unit Mode 1
▪0: Auto
▪1: Heat
▪2: Dry
▪3: Fan
▪4: Cool
2
3
R/W
AC unit Fan Speed 1
▪1: Low
▪2: Mid
▪3: High
3
4
R/W
AC unit Vane Position 1
▪1: Position-1 (Horizontal)
▪2: Position-2 (Horizontal)
▪3: Position-3 (Medium)
▪4: Position-4 (Vertical)
▪5: Position-5 (Vertical)
▪10: Swing
4
5
R/W
AC unit Temperature Setpoint 1,2,3
▪-32768 (Initialization value)
▪16..31ºC (ºC/x10ºC)
▪61..92ºF
1
Available values will depend on the AC unit mode. Check the AC unit model functions in its user manual to know the possible values for
this register.
2
Magnitude for this register can be adjusted to Celsius x 1ºC, Celsius x 10ºC (default) or Fahrenheit. See section 4.2.3 for more
information.
3
It is not possible turn to x10 the value shown in Fahrenheit.

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Register Address
(protocol address)
Register Address
(PLC address)
R/W
Description
5
6
R
AC unit Temperature reference 1,2,3
▪-32768 (Initialization value)
▪10..38ºC (ºC/x10ºC)
▪50..100ºF
6
7
R/W
Window Contact
▪0: Closed (Default)
▪1: Open
7
8
R/W
FJ-RC-MBS-1 Disablement 4
▪0: FJ-RC-MBS-1 enabled (Default value)
▪1: FJ-RC-MBS-1 disabled
8
9
R/W
AC Remote Control Disablement 4
▪0: Remote Control enabled (Default value)
▪1: Remote Control disabled
9
10
R/W
AC unit Operation Time 4
▪0..65535 (hours). Counts the time the AC
unit is in “On” state.
10
11
R
AC unit Alarm Status
▪0: No alarm condition
▪1: Alarm condition
11
12
R
Error Code 5
▪0: No error present
▪65535(-1 if it is read as signed value): Error
in the communication of FJ-RC-MBS-1 or
Remote Controller with the AC unit.
▪Any other error present, see the table at the
end of this document.
22
23
R/W
Indoor unit´s ambient temperature from
external sensor (at Modbus side) 1,2,3,6
▪-32768: (Initialization value). No
temperature is being provided from an
external sensor.
▪Any other: (ºC/x10ºC/ºF)
23
24
R
AC Real temperature setpoint 1,2,3,6
▪When no external temperature is provided,
this read-only register will have the same
value as register 5 (PLC addressing). In all
cases, it will show the current setpoint in the
indoor unit.
▪16..31ºC (ºC/x10ºC)
▪60..92ºF
24
25
R
Current AC max setpoint 1,2,3
▪-32768 (Initialization value)
▪Ranges are specific from Manufacturer
25
26
R
Current AC min setpoint 1,2,3
▪-32768 (Initialization value)
▪Ranges are specific from Manufacturer
26
27
R/W
AC unit Horizontal Vane Position 1
▪0: Auto (Default)
▪10: Swing
27
28
W
Up/Down Vane Pulse
▪1: Pulse
4
This value is stored in non-volatile memory
5
See section 7 for possible error codes and their explanation
6
See section 4.2.3 for more information

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Register Address
(protocol address)
Register Address
(PLC address)
R/W
Description
31
32
R
Status (feedback)
▪0: Not active (Default value)
▪1: Active (A window is open)
34
35
W
Left/Right Vane pulse
▪1: Pulse
64
65
R/W
Economy
▪0: Disabled
▪1: Enabled
65
66
R
Input reference temperature 1,2,3
▪0x8000: No temperature’s value is being
provided from an external sensor. No virtual
temperature is being applied.
▪Any other: (ºC/x10ºC/ºF)
81
82
R
Error address
▪Provides the indoor unit number which is
providing error
97
98
R/W
Block Periodic Sendings 4,7,8
▪0: Non-blocked (Default value)
▪1: Blocked
98
99
R
Master/Slave (gateway’s role)
▪0: Slave
▪1: Master
4.2.2 Configuration Registers
Register Address
(protocol address)
Register Address
(PLC address)
R/W
Description
13
14
R/W
“Open Window” switch-off timeout 9
▪0..30 (minutes)
▪Factory setting: 30 (minutes)
14
15
R
Modbus RTU baud-rate
▪2400bps
▪4800bps
▪9600bps (Default)
▪19200bps
▪38400bps
▪57600bps
▪76800bps
▪115200bps
15
16
R
Modbus Slave Address
▪1..63
21
22
R
Max number of fan speeds
48
49
R
Switch value
49
50
R
Device ID: 0x0D00
50
51
R
Software version
7
If the register is configured as “0:Non-blocked”, all commands received from Modbus will be sent to the AC system. If “1: Blocked”,
commands from Modbus will only be sent to the AC system if they differ from the previous value.
8
This register applies to firmware version 2.5 onwards
9
Once window contact is open, a count-down to switch off the AC Unit will start from this configured value.

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4.2.3 Considerations on Temperature Registers
•AC unit temperature setpoint (R/W)
(register 4 –in Protocol address / register 5 –in PLC address):
This is the adjustable temperature setpoint value that must be required by the user. This
register can be read (Modbus function 3 or 4) or written (Modbus functions 6 or 16). A
remote controller connected to the Fujitsu indoor unit will report the same temperature
setpoint value as this register, but only will happen when no AC unit´s external
reference is provided from FJ-RC-MBS-1 (see detail for register 22/23 below).
•AC unit temperature reference (R)
(register 5 –in Protocol address / register 6 –in PLC address):
This register reports the temperature that is currently used by the Fujitsu indoor unit as
the reference of its own control loop. Depending on the configuration of the indoor unit,
this value can be the temperature reported by the sensor on the return path of the
Fujitsu indoor unit or the sensor of its remote controller. It is a read-only register
(Modbus functions 3 or 4).
•AC unit external temperature reference (Modbus) (R/W)
(register 22 –in Protocol address / register 23 –in PLC address):
This register allows us to provide an external temperature’s sensor from the Modbus
side. Fujitsu indoor unit does not allow on devices like FJ-RC-MBS-1 to provide directly
temperature to be used as a reference of the control loop of the AC indoor unit. In order
to overcome this limitation and enable the usage of an external temperature sensor
(i.e.from Modbus side), FJ-RC-MBS-1 applies the following mechanism (only if “external
temperature’s reference” is being used):
oAfter a couple of values have been entered in the “AC unit external temperature’s
reference” (register 22/23) and “AC unit temperature set point” (register 4/5),
FJ-RC-MBS-1 is going to estimate the temperature chosen implied (e.g. if a
“temperature setpoint (register 4/5)” of 22ºC, and an “external temperature
reference (register 22/23)” of 20ºC are entered, FJ-RC-MBS-1 will assume that
the user is demanding a +2ºC increase in temperature).
oBy knowing at any time the ambient temperature currently used by the indoor
unit to control its own operation (register 5/6), FJ-RC-MBS-1 can calculate the
required temperature setpoint needed to apply the decrease/increase on the real
temperature and reach the temperature chosen by the user (following the
example above, if FJ-RC-MBS-1 reads an “ambient temperature” (register 5/6) of
24ºC in the indoor unit, it will apply a final setpoint of 24ºC + 2ºC = 26ºC).
oAt this moment, each time that FJ-RC-MBS-1 detects a change on the ambient
temperature reported by the indoor unit (register 5/6), it will also change the
required setpoint, in order to keep the temperature required by the user at any
time. If we follow the last example, if FJ-RC-MBS-1 receives a new temperature´s
value coming from the indoor unit of 25ºC, FJ-RC-MBS-1 will automatically adjust
the temperature setpoint required of the AC indoor unit to 25ºC + 2ºC = 27ºC).
oIn general, FJ-RC-MBS-1 is constantly applying the “Virtual Temperature”
formula:
SAC =Su–( Tu–TAC )

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Where:
SAC - setpoint value currently applied to the indoor unit
Su- setpoint value written at Modbus side (register 4/5)
Tu- external temperature reference written at Modbus side (register 22/23)
TAC - ambient temperature that the indoor unit is using as the reference of its
own control loop (register 5/6)
When FJ-RC-MBS-1 detects a change in any of the values of
{Su, Tu, TAC }, it will send the new setpoint (SAC) to the indoor unit.
oAfter the startup, the value for “external temperature’s reference” (register
22/23) has a value -32768 (0x8000). This value means that no external
temperature reference is being provided through FJ-RC-MBS-1. In this scenario,
the setpoint value shown in register 4/5 will always be the same as the current
setpoint value of the indoor unit. AC indoor unit will use its own return path
temperature sensor as reference for its control loop.
oWhen the mechanism of “Virtual Temperature” is applied. The temperature
setpoint’s value shown by the Remote Controller or other Control System from
Fujitsu connected to the indoor unit may show a different value from the value
shown in register 4/5.
oIf it is desired to use the temperature’s reading from the Remote Control as the
external temperature reference (Tu,register 22/33), the Remote Controller must
be configured as Master, and the Fujitsu AC indoor unit must have the option
“thermostat sensor in the Remote Controller”as activated. This configuration is
done via a Fujitsu Remote Controller connected to the indoor unit and must be
done by Fujitsu authorized installers while the AC is being installed.
oWhen FJ-RC-MBS-1 is set as “Master” of FG bus (BWR), the external
temperature’s sensor connected to Modbus RTU EIA-485 network provides
directly the value currently applied to the indoor unit ( SAC ), and the process of
the Virtual temperature is not applied. In this case, the Remote Controller or any
other Control System connected from Fujitsu is not able to send the external
temperature reference’s value to the register 22/23.
•AC Real temperature setpoint (R)
(register 23 –In Protocol address / register 24 –in PLC address):
As it has been detailed on the previous point, the real temperature setpoint in the indoor
unit and the temperature setpoint requested from FJ-RC-MBS-1 might differ (when a
value in register 22/23 –“external temperature reference” is entered). This register
always informs about the current temperature setpoint which is being used by the indoor
unit –it is also includes the temperature setpoint that will be shown by an additional
remote controller from Fujitsu connected to the indoor unit, if it is present on the
system.
Moreover, notice that temperature’s values of all these four registers are expressed according to
the temperature´s format configured through its onboard DIP-Switches (See 4.3 “DIP-switch
Configuration Interface”). These following formats are possible:

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•Celsius value: Value in Modbus register is the temperature value in Celsius (i.e. a
value “22” in the Modbus register must be interpreted as 22ºC).
•Decicelsius value: Value in Modbus register is the temperature value in
decicelsius (i.e. a value “220” in the Modbus register must be interpreted as
22.0ºC).
•Fahrenheit value: Value in Modbus register is the temperature value in
Fahrenheit (i.e. a value “72” in the Modbus register must be interpreted as 72ºF
(~22ºC).

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4.3 DIP-switch Configuration Interface
All the configuration values on FJ-RC-MBS-1 can be written and read from Modbus interface.
Otherwise, some of them can also be setup from its on-board DIP-switch interface.
The device has DIP-switches SW1, SW3 and SW4 on the following locations:
The following tables apply to the interface´s configuration through DIP-switches:
SW1 –AC indoor unit’s features
SW1-P1..4
Description
Slave - A Fujitsu Controller must be present in BWR bus, configured as Master (Default value)
Master –Fujitsu Controller not needed in BWR bus. If it exists, it must be configured as Slave
Keep the switch into this position (Default value)
Do not turn the switch into this position (not applicable)
Machine type: RAC inverter model G series, VRF J-II, VRF V-II or VRF VR-II 10 (Default value)
Machine type: RAC inverter, RAC non-inverter, VRF V, VRF S or VRF J
Keep the switch into this position (Default value)
Do not turn the switch into this position (not applicable)
Table 4.1 SW1: AC indoor unit´s features
10
* G series stands for units that include a ‘G’ just before the power number in its reference. E.g.: ASYG09LTCA
SW3
SW4
IntesisBox®
FJ-RC-MBS-1
EIA485
A+ B-
B W R
AC Unit
SW1
SW1
SW4
ON
1 2 3 4
ON
SW3
1 2 3 4
1 2 3 4 5 6 7 8
ON
ON
ON
ON
ON
ON
ON
ON
ON

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SW3/SW4 –Baud rate configuration
SW3-P7..8
SW4-P3
Description
2400bps
4800bps
9600bps (Default value)
19200bps
38400bps
57600bps
76800bps
115200bps
Table 4.2 SW3-SW4: Modbus baud rate
SW4 –Degrees/Decidegrees (x10), temperature magnitude (ºC/ºF) and EIA-485 termination
resistor.
Table 4.3 SW4: Temperature and termination resistor configuration
SW4-P1..2-4
Description
Temperature values in Modbus register are represented in degrees (x1) (Default value)
Temperature values in Modbus register are represented in decidegrees (x10)
Temperature values in Modbus register are represented in Celsius degrees (Default value)
Temperature values in Modbus register are represented in Fahrenheit degrees
EIA-485 bus without termination resistor (Default value)
Internal termination resistor of 120Ω connected to EIA-485 bus
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON

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SW3 –Modbus Slave address
Table 4.4 SW3: Modbus slave address
Add
SW3-P1..6
Add
SW3-P1..6
Add
SW3-P1..6
Add
SW3-P1..6
Add
SW3-P1..6
0
13
26
39
52
1
14
27
40
53
2
15
28
41
54
3
16
29
42
55
4
17
30
43
56
5
18
31
44
57
6
19
32
45
58
7
20
33
46
59
8
21
34
47
60
9
22
35
48
61
10
23
36
49
62
11
24
37
50
63
12
25
38
51
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON

FJ-RC-MBS-1
User’s Manual r1.9 EN
© 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
URL
Email
Phone
http://www.intesisbox.com
[e-mail]
[phone]
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4.4 Implemented Functions
FJ-RC-MBS-1 implements the following standard Modbus functions:
▪3: Read Holding Registers
▪4: Read Input Registers
▪6: Write Single Register
▪16: Write Multiple Registers (Despite this function is allowed, the interface does not
allow to write operations on more than 1 register with the same request, this means that
length field should be always be 1 when this function is being used in case of writing)
4.5 Device LED indicator
The device includes two LED indicators to show all the possible operational states. In the
following table there are written the indicators which can be performed and their meaning.
L1 (green LED)
Device status
LED indication
ON / OFF Period
Description
During not normal
operation
LED blinking
500ms ON / 500ms OFF
Communication error
During normal
operation
LED flashing
100ms ON / 1900ms OFF
Normal operation (configured and
working properly)
L2 (red LED)
Device status
LED indication
ON / OFF Period
Description
During not normal
operation
LED Pulse
3sec ON / --- OFF
Under voltage
L1 (green LED) & L2 (red LED)
Device status
LED indication
ON / OFF Period
Description
During normal
operation
LED Pulse
5sec ON / --- OFF
Device Start-up
During not normal
operation
LED alternatively
blinking
500ms ON / 500ms OFF
Flash checksum not OK

FJ-RC-MBS-1
User’s Manual r1.9 EN
© 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
URL
Email
Phone
http://www.intesisbox.com
[e-mail]
[phone]
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4.6 EIA-485 bus. Termination resistors and Fail-Safe Biasing
mechanism
EIA-485 bus requires a 120Ω terminator resistor at each end of the bus to avoid signal
reflections.
In order to prevent fail status detected by the receivers, which are “listening”the bus, when all
the transmitters’outputs are in three-state (high impedance), it is also required a fail-safe
biasing mechanism. This mechanism provides a safe status (a correct voltage level) in the bus
when all the transmitters’ outputs are in three-state. This mechanism must be supplied by the
Modbus Master.
The FJ-RC-MBS-1 device includes an on-board terminator resistor of 120Ω that can be
connected to the EIA-485 bus by using DIP-switch SW4.
Some Modbus RTU EIA-485 Master devices can provide also internal 120Ω terminator resistor
and/or fail safe biasing mechanism (Check the technical documentation of the Master device
connected to the EIA-485 network in each case).

FJ-RC-MBS-1
User’s Manual r1.9 EN
© 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
URL
Email
Phone
http://www.intesisbox.com
[e-mail]
[phone]
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5. Mechanical and electrical features
Enclosure
Plastic, type PC (UL 94 V-0)
Net dimensions (dxwxh):
93 x 53 x 58 mm / 3.7” x 2.1” x 2.3”
Color: Light Grey. RAL 7035
Operation
Temperature
0ºC to +60ºC
Weight
85 g.
Stock
Temperature
-20ºC to +85ºC
Mounting
Wall
DIN rail EN60715 TH35.
Operational
Humidity
<95% RH, non-condensing
Terminal Wiring
(for low-voltage
signals)
For terminal: solid wires or stranded wires
(twisted or with ferrule)
1 core: 0.5mm2… 2.5mm2
2 cores: 0.5mm2… 1.5mm2
3 cores: not permitted
Stock Humidity
<95% RH, non-condensing
Modbus RTU
port
1 x Serial EIA485 Plug-in screw terminal
block (2 poles):
A, B
Compatible with Modbus RTU EIA-485
networks
Isolation voltage
1500 VDC
AC unit port
1 x BWR bus Plug-in screw terminal block
(3 poles):
B, W, R
Compatible with Fujitsu networks
Isolation
resistance
1000 MΩ
Switch 1
(SW1)
1 x DIP-Switch for AC features
Protection
IP20 (IEC60529)
Switch 3
(SW3)
1 x DIP-Switch for Modbus RTU settings
LED indicators
2 x Onboard LED - Operational
status
Switch 4
(SW4)
1 x DIP-Switch for extra functions
EIA-485
Port
AC Unit
connection
DIP
Switch SW3
DIP Switch
SW1
LED
Indicators
DIP
Switch SW4

FJ-RC-MBS-1
User’s Manual r1.9 EN
© 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
URL
Email
Phone
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[e-mail]
[phone]
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6. List of supported AC Unit Types.
A list of Fujitsu indoor unit model’s references compatible with FJ-RC-MBS-1 and its available
features can be found on this link:
https://www.intesisbox.com/intesis/support/compatibilities/IntesisBox_FJ-RC-xxx-1_AC_Compatibility.pdf

FJ-RC-MBS-1
User’s Manual r1.9 EN
© 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
URL
Email
Phone
http://www.intesisbox.com
[e-mail]
[phone]
20/24
7. Error Codes
To obtain the error which belongs to the Error Codes list, remember that it must be selected the
right position of the DIP-switch SW1 (See Section 4.3). Here there are two lists. It must be
chosen only one list depending on the system installed.
7.1 Intesis Codes
Error Code
Modbus
Error in
Remote
Controller
Error Description
0
N/A
No active error
65535
(-1)
N/A
Error in the communication of FJ-RC-MBS-1 or Remote Controller with
the AC unit
7.2 RAC and VRF J-II / V-II / VR-II series
Error Code
Modbus
Error in
Remote
Controller
System
Error Description
0
00
Wired remote controller error
1
01
Indoor signal error
2
02
Indoor room temperature sensor error
3
03
Indoor room temperature sensor error
4
04
Indoor heat exchanger temperature sensor (middle) error
5
05
Indoor heat exchanger temperature sensor (middle) error
6
06
Outdoor heat exchanger temperature sensor (outlet) error
7
07
Outdoor heat exchanger temperature sensor (outlet) error
8
08
Power voltage error
9
09
Float switch operated
10
0A
Outdoor temperature sensor error
11
0b
Outdoor temperature sensor error
12
0C
Outdoor discharge pipe temperature sensor error
13
0d
Outdoor discharge pipe temperature sensor error
14
0E
Heat sink thermistor (Inverter) error
15
0F
Discharge temperature error
17
11
Indoor unit EEPROM error
18
12
Indoor fan error
19
13
Indoor signal error
20
14
Outdoor EEPROM error
21
15
RAC
Compressor temperature sensor error
22
16
Inverter
and
Pressure switch abnormal, Pressure sensor error
23
17
Non
Inverter
IPM protection
24
18
CT error
25
19
Active filter error
INV voltage protection
26
1A
Compressor location error
27
1b
Outdoor fan error
28
1C
Outdoor unit computer communication error
29
1d
2-way valve temperature sensor error