REACT
Modbus
20150922
Transmission protocol
Protocol:
ModBus / RTU
Baud rate:
1200, 2400, 4800, 9600, 19200, 38400
Byte sequence:
MSB / LSB
Byte format:
8 data bits, 2 stop bits, none parity
8 data bits, 1 stop bits, even parity
8 data bits, 1 stop bits, odd parity
Resistance:
120 Ohm (external)
Delay:
Some master devices need a certain amount of time to
switch from the transmission mode to reception mode.
The delay time can be set in 3 ms steps.
Maximum 765 ms (255 × 3 ms)
Response time:
≤ 10 ms + delay.
Standard communication parameter:
1 start bit
Communication setting 14
19200 baud
8 data bits
1 stop bits
even parity
delay 0 ms
The values of baud rate, parity, stop-bit and delay are programmable.
Function-code Modbus
Following functions codes are implemented:
Function code
Name
Description
03h
Read hold register
Device parameter / actual values read (integer / float)
06h
Write single register
Device parameter single word write
REACT Modbus
Holding register Costumer (parameter table)
Name
2
Address
decimal
Data type
Value range
r/w
Description
Set point
0
WORD
0…10000
r/w
Set point [%] 0=0%, 10000=100%
see register 122:
'0': set point is read only
Override control
1
WORD
0…4
r/w
Override control
'0’ Override control not available
'1’ open
'2‘ close
'3' min
'4' max
Command
2
WORD
0…4
r/w
Command
'0’ - - '1’ adaption
'2‘ - - '3' - - '4' controller reset
Device ID
3
WORD
0..3
r
Device ID
'0’ - - '1’ standard actuator
'2‘ VAV
'3' fire damper
Relative position
4
WORD
0…10000
r
Relative position [%] 0=0%, 10000=100%
65535 = this function is not
supported
Absolute position
5
WORD
0…65000
r
Absolute position [°] 0..650.00
65535 = this function is not
supported
Relative flow
6
WORD
0…10000
r
VAV flow [%] 0=0%, 10000=100%
Absolute flow
7
WORD
0…65535
r
VAV flow [m³/h][l/s]
Analog output
(optional)
10
WORD
[mV]
0…10000
r/w
Analog output
[mV] 0 ..10000
see register 122
Swegon reserves the right to alter specifications.
20150922
REACT Modbus
Service Values
Name
Address
decimal
Data
type
Value
range
r/w
Description
Software
version
103
WORD
1..65535
r
Software version
Min value
relative
105
WORD
0..10000
r/w
Min flow in % of nominal flow [%] 0=0%, 10000=100%
Max value
relative
106
WORD
0..10000
r/w
Max flow in % of nominal flow [%] 0=0%, 10000=100%
Bus fail
position
108
WORD
0..2
r/w
Bus fail position
'0’ - - No bus monitoring
'1' at timeout position close bus monitoring timeout 120s
'2’ at timeout position open bus monitoring timeout 120s
Min
value
absolute
120
WORD
0..65535
r/w
Min value [m³/h][l/s]
Max
value
absolute
121
WORD
0..65535
r/w
Max value [m³/h][l/s]
Mode signal
set point
analog
output
Modbus
address
122
130
WORD
WORD
0..3
1 -247
r/w
r/w
Value Referencing signal
Analog
Out
0
Analog In 1 [V] 0(2)…10
Absolute position [V] 0
..10
1
Communication via
Modbus register 0
absolute position[V] 0
..10
2
Communication via
Modbus register 0. 0% =
Min. flow, 100% = Max.
flow
Value register 10
3
Analog IN 1 [V] 0(2)…10
Value register 10
Modbus address 1 – 247
20150922
Swegon reserves the right to alter specifications.
3
REACT Modbus
Customer values
Name
Address decimal
Data type
Value range
r/w
Description
Vnom
Vnom
201
unit/function
WORD
0…1
r/w
'0’ [l/s],
'1’ [m³/h]
Error handling
Error code
Name
Description
01h
Illegal function
The function code received in the query is not an
allowable action.
02h
Illegal data address
The data address received in the query is not an
allowable register address. Register address are
read only.
03h
Illegal data value
A value contained in the query data field is not
an allowable value. Wrong number of registers.
Register address are read only.
06h
Slave device busy
Specialized use in conjunction with programming
commands. The server (or slave) is engaged in
processing a long–duration program command.
Description interface parameter ModBus
Display number
4
EEPROM value
Baudrate
Parity
Stop bits
1
0
1200
None
2
2
1
1200
Even
1
3
2
1200
Odd
1
4
3
2400
None
2
5
4
2400
Even
1
6
5
2400
Odd
1
7
6
4800
None
2
8
7
4800
Even
1
9
8
4800
Odd
1
10
9
9600
None
2
11
10
9600
Even
1
12
11
9600
Odd
1
13
12
19200
None
2
14
13
19200
Even
1
15
14
19200
Odd
1
16
15
38400
None
2
17
16
38400
Even
1
18
17
38400
Odd
1
Swegon reserves the right to alter specifications.
20150922
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