Basic characteristics of the Modbus-RTU controller
Addressing
Diffusion
Transmission speed
Parity
Mode
Electrical interface
Connector type
MODBUS message
Address
8 bits
The format for each byte in RTU mode is:
Code system:
8–bit binary
Bits per Byte:
1 bit of START (start)
8 data bits, the most signifi cant bit is sent the fi rst
1 bit for the parity (Even parity required)
1 bit of STOP (end)
Modbus memory map
Nº
Type of register
Reg.
General confi guration
9
Coil
7
Coil
0
Coil
0
Input Register
1
Input Register
2
Input Register
3
Input Register
4
Input Register
Slave: confi gurable address from 1 to 247
Yes
9600
EVEN
RTU
RS-485 2W-wired or RS232
RJ 45
Function
8 bits
Description
Range
Unit status
0
1
Contact CLP
0
start/stop
1
Fans working mode
0
1
Vin
0 - 10
TODA
-30 - 50
TETA
-30 - 50
TEHA
-30 - 50
TSUP
-30 - 50
Data
N x 8 bits
Data
Default
value
Off
1
Run
Contact NO
0
Contact NC
VAV mode
0
COP mode
V
ºC
ºC
ºC
ºC
CRC verifi cation
16 bits
R/W
Comments
R/W
R/W
R/W
R
Analogic input value (V)
R
Outdoor Air Temperature
(Fresh air)
R
Extract Air Temperature
(Foul air)
R
Exhaust Air Temperature
(Foul air)
R
Supply Air Temperature
(Fresh air)
27
Need help?
Do you have a question about the CADB-HE BASIC Series and is the answer not in the manual?