MODBUS message
Direction
Function
8 bits
8 bits
Format for each byte in RTU mode is:
• System codes: 8–bit binary
• Bits per Byte: 1 bit to START (start)
8 bits for data, the most signifi cant bit is sent fi rst
1 bit for parity (Even parity is required)
1 bit for STOP (end)
8.2. MODBUS MEMORY MAP
Holding registers
N°REG.
Register
0
TipoMotor
1
ModoFun
2
SensorPI
3
Sensor1
4
Sensor2
5
PIRange
6
SetPoint
7
Kp
8
Ki
Dates
CRC verifi cation
N x 8bits
16 bits
Min.
Max.
Description
0
1
0=PI_Presión
1=PI_Caudal
2=Proporcional
3=Max-Min
0
7
4=PI_Presión+RTC
5=PI_Caudal+RTC
6=Proporcional+RTC
7=Max-Min+RTC
0=Interno
1=IN1 0-10V
0
4
2=IN1 4-20mA
3=IN2 0-10V
4=IN2 4-20mA
1=0-10V %HR
2=4-20mA %HR
3=0-10V °C
0
7
4=4-20mA °C
5=0-10V CO2
6=4-20mA CO2
7=NTC 100K
1=0-10V %HR
2=4-20mA %HR
0
6
3=0-10V °C
4=4-20mA °C
5=0-10V CO2
6=4-20mA CO2
50
1250
SensorPI=0
50
2500
SensorPI<>0
100
9900
Sensor<>0
0=Interno
1=IN1 0-10V
2=IN1 4-20mA
0
5
3=IN2 0-10V
4=IN2 4-20mA
5=ConsolaMODBUS
(PROSYS ECOWATT)
1
250
Increases 1
1
250
Increases 1
Default
0=AC
1
1=DC
0
0
0=NO
0
0=NO
0
400Pa
5
20
20
57
Comments
Motor type
Operation mode
Sensor type in PI
PRESSURE or PI VOLUME
mode
Sensor type in
PROPORTIONAL mode
and analog input signal 1
Sensor type in
PROPORTIONAL mode
and analog input signal 2
Range sensor in PI
PRESSURE mode
Set point in PI PRESSURE
mode
Proportional constant in PI
PRESSURE mode
Integral constant in PI
PRESSURE mode