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RTD Networking
ADDRESSING
The RTD-10 has the facility to create control groups using multiple
RTDs connected together on the RS485 D-Bus network. In standard
configuration up to 16 RTD-10 devices can be connected together.
Each RTD is assigned a D-Bus address using the configuration
switches SW1.5 to SW1.8. Unit addresses are shown below.
ADDRESS 0
ADDRESS 1
ADDRESS 2
ON
ON
ON
1 2 3 4
5 6 7 8
1 2 3 4
5 6 7 8
1 2 3 4
5 6 7 8
ADDRESS 4
ADDRESS 5
ADDRESS 6
ON
ON
ON
1 2 3 4
5 6 7 8
1 2 3 4
5 6 7 8
1 2 3 4
5 6 7 8
ADDRESS 8
ADDRESS 9
ADDRESS 10
ON
ON
ON
1 2 3 4
5 6 7 8
1 2 3 4
5 6 7 8
1 2 3 4
5 6 7 8
ADDRESS 12
ADDRESS 13
ADDRESS 14
ON
ON
ON
1 2 3 4
5 6 7 8
1 2 3 4
5 6 7 8
1 2 3 4
5 6 7 8
Address 0 is the RTD-10 MASTER address. Address 1 to 15 are RTD-
10 SLAVE addresses.
NETWORK INSTALLATION
The RS485 D-Bus network requires a twisted pair cable connecting
terminals DB(+) and DA(-) on each RTD as shown below. Terminal DB
must be connected to all other DB terminals. Terminal DA must be
connected to all other DA terminals. In addition the common terminal
GND on all devices must be connected together. If a shielded cable is
used then the shield can be used for this purpose. It is recommended
that the GND connection is connected to local Earth at one point only.
The network must be installed as a daisy-chained point-to-point Bus
configuration, Star and Ring connections must NOT be used.
ADDRESS 0
ADDRESS 1
ON
ON
1 2 3 4
5 6 7 8
1 2 3 4
RS485 D-BUS
DB DA GND
+
-
DB(+)
DB(+)
DA(-)
DA(-)
GND
GND
SPECIFICATION
Use stranded 24awg shielded or unshielded twisted pair to Cat3, Cat4
or Cat5 specification. Use a twisted pair for connections DB,DA and an
extra core for connection GND.
NETWORK LENGTH
Standard installation for total network distances of up to 500m can be
achieved following the basic daisy-chaining method showed in the
above diagram. The network can be extended further using RS485
repeaters.
Modbus Operation
CONTROL
The RTD-10 can be operated from both
the hard-wired inputs and Modbus register
commands if input S6 is open-circuit.
Under this mode of operation control
updates will be sent if a change is made to
either a Modbus register or a wired input.
ADDRESS 3
All control registers are analogue Holding
ON
Registers
1 2 3 4
5 6 7 8
ADDRESS 7
Holding
Name
ON
Register
1 2 3 4
5 6 7 8
0001
Setpoint
ADDRESS 11
ON
0002
Fanspeed
1 2 3 4
5 6 7 8
0003
Mode
ADDRESS 15
0004
Louvre
ON
1 2 3 4
5 6 7 8
0005
OnOff
*Where HighHigh fanspeed is enabled, High1 = High, High2= HighHigh. Otherwise both modes select High
Holding
Name
Register
0010
All Lock
0011
Setpoint Lock
0012
Fanspeed Lock
0013
Mode Lock
0014
Louvre Lock
0015
OnOff Lock
*Last Touch updates are written to the A/C on every register write. On Change updates are only sent if the
value written changes. Central locks the corresponding RC button. Local unlocks the RC button and prevents
any updates from the RTD.
MONITORING
Unit data is available for each of the indoor units on the P1,P2 network. All
readback data is available in analogue Input Registers. Input registers are
numbered using the indoor unit number x 100 added to an offset relating to a
specific feature. Group data is available as unit 0.
Group*
Unit 1
0020
0120
5 6 7 8
0021
0121
RS485 D-BUS
DB
DA GND
+
-
0022
0122
0023
0123
* Group Unit Exists returns the number of units found. Group Fault Code returns the fault code of the first unit
in fault. Group Return Air Temp returns the average unit temperature.
FAULT CODES
Fault codes are encoded using a standard table to allow standard Daikin fault
codes to be generated from the readback value. The no fault value is 255.
KEYPAD LOCK
When the keypad is locked using input S6 then Modbus commands will not
change the lock state but unit settings can still be adjusted. When the S6 input
is set to unlock the keypad then Modbus commands can change the lock state.
Additional Modbus registers and more detailed Modbus engineering
instructions are available in the RTD-NET datasheet. available from
http://www.realtime-controls.co.uk/rtd. A full list of fault codes is also
available from this link.
MODBUS CONFIGURATION
Network 3 wire RS485
Mode
Modbus RTU Slave
Baud
9600
Parity
None
Stop bits 1
Note: RTD interfaces can be configured
with different baud rate and parity settings
if required
Range
16..32
1..3 (1:Low, 2:High1, 3: High2*)
0..4 (0:Auto, 1:Heat, 2:Fan, 3:Cool, 4:Dry)
1..7 (1:Swing, 2: 0 Degrees, 3: 20 Degrees, 4:45 Degreees,
5:70 Degrees, 6:90 Degrees )
0..1 (0:Off, 1:On)
Lock Mode*
0:LastTouch,1:Central,2:Local,3:OnChange
0:LastTouch,1:Central,2:Local,3:OnChange
0:LastTouch,1:Central,2:Local,3:OnChange
0:LastTouch,1:Central,2:Local,3:OnChange
0:LastTouch,1:Central,2:Local,3:OnChange
0:LastTouch,1:Central,2:Local,3:OnChange
Unit 2
...
Unit16
Name
Range
0220
...
1620
Unit Exists
0..1
0221
...
1621
Is Fault
0..1
0222
...
1622
Fault Code
0..65535
0223
...
1623
Return Air Temp
Degrees C x 100
VAM and VKM Unit Operation
VAM and VKM units can be switched on and off using the RTD-10 On/off input.
Control of VAM and VKM unit fanspeed and damper position from RTD-10
inputs or from Modbus registers is also possible using extended RTD-10
operating modes.
More details are available from http://www.realtime-controls.co.uk/rtd
LED Functionality
Key:
OFF
Normal Operation
R
Power-Up sequence
Factory Configuration
G
R
Power-Up sequence
Custom Configuration
G
P1,P2 Search. After
R
power-up and during
G
unit configuration
Error Conditions
R
Device configuration error
G
R
AC Unit Missing (U5 Fault)
G
R
RS485 Communications timeout
G
UNIT SEARCH
When the RTD-10 is powered up, or if it looses communication with the
Remote Controller the RTD-10 enters P1,P2 search mode. If P1,P2
communications are not re-established after 1 minute the RTD-10 will raise an
alarm which will be indicated on the fault relay output.
Functional Specification
Electrical
Environmental
Supply
15V-24V DC, 120mA
Temperature
Regulated
Storage
Power
<2.5VA
Operation
Relay
1A, 24VAC max
Humidity
1A, 30VDC max
Mechanical
Protection
Dimensions
H100 x W100 x D22 mm
EMC Emissions
Mounting
Four screw / pillar mounts
EMC Immunity
Inputs
Casing
Zinc coated mild steel
Voltage Mode
Weight
120g
2
Connectors
Resistance Mode
Rising clamp to 0.75mm
cable
RTD-10 Datasheet Issue 1.04.01 © RealTime Control Systems Limited, 2010
FLASHING
ON
R
No Fault State
G
R
Unit Fault
G
-10oC to 50oC
0oC to 50oC
0-90% RH
non-condensing
IP30
EN61000-6-1
EN61000-6-3
S1..S6 0..10VDC <1mA
Maximum Rating 12VDC
S1..S6 5V, 1mA
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