NOVUS AUTOMATION
12/28
7
SERIAL COMMUNICATION
The
NP785 Ultra Low
Differential Pressure Transmitter
can be recognized on an RS485 network with Modbus RTU protocol as a slave device. All
the configurable parameters of the device can be read and/or written via serial communication.
The device supports writing in Broadcast mode, using the slave address Modbus
0
.
The available Modbus commands are as follows:
03 – Read Holding Register
05 – Write
Single Coil
06 – Write
Single Register
16 – Write
Multiple Register
7.1
REGISTERS TABLE
NP785-05 Model: Output Registers Table
Address
Name
Description
R/W
Type
Standard
Min.
Max.
Decimal Places
0
HR_PRESS
Differential pressure
value
RO
int_32
0
-5 mbar
-72,52 mpsi
-2,007 inH2O
-50,98 mmH2O
-500,0 Pa
5 mbar
72,52 mpsi
2,007 inH2O
50,98 mmH2O
500,0 Pa
mbar:
3 decimal places
mpsi:
2 decimal places
inH2O:
3 decimal places
mmH2O:
2 decimal
places
Pa:
1 decimal place
1
HR_PRESS_H
2
HR_PRESS_MIN
Minimum differential
pressure value
logged
RO
int_32
0
-5 mbar
-72,52 mpsi
-2,007 inH2O
-50,98 mmH2O
-500,0 Pa
5 mbar
72,52 mpsi
2,007 inH2O
50,98 mmH2O
500,0 Pa
mbar:
3 decimal places
mpsi:
2 decimal places
inH2O:
3 decimal places
mmH2O:
2 decimal
places
Pa:
1 decimal place
3
HR_PRESS_MIN_H
4
HR_PRESS_MAX
Maximum differential
pressure value
logged
RO
int_32
0
-5 mbar
-72,52 mpsi
-2,007 inH2O
-50,98 mmH2O
-500,0 Pa
5 mbar
72,52 mpsi
2,007 inH2O
50,98 mmH2O
500,0 Pa
mbar:
3 decimal places
mpsi:
2 decimal places
inH2O:
3 decimal places
mmH2O:
2 decimal
places
Pa:
1 decimal place
5
HR_PRESS_MAX_H
Table 04
– NP785-05 Model: Output Registers Table
NP785-05 Model: Configuration Registers Table
Address
Name
Description
R/W
Type
Standard
Min.
Max.
Decimal Places
100
HR_SENSOR_TYPE
Sensor type: 5 mbar or
20 mbar
RO
uint16
0
0
1
N.A.
101
HR_OUT1_TYPE
Retransmission output
type*
RW
uint16
0
0
1
N.A.
103
HR_OUT1_IN_HIGH_LIMIT
Retransmission upper
limit input
RW
int_32
5 mbar
72,52 mpsi
2,007 inH2O
50,98 mmH2O
500,0 Pa
-5 mbar
-72,52 mpsi
-2,007 inH2O
-50,98 mmH2O
-500,0 Pa
5 mbar
72,52 mpsi
2,007 inH2O
50,98 mmH2O
500,0 Pa
mbar:
3 decimal
places
mpsi:
2 decimal
places
inH2O:
3 decimal
places
mmH2O:
2 decimal
places
Pa:
1 decimal place
104
HR_OUT1_IN_HIGH_LIMIT_H
105
HR_OUT1_IN_LOW_LIMIT
Retransmission lower
limit input
RW
int_32
-5 mbar
-72,52 mpsi
-2,007 inH2O
-50,98 mmH2O
-500,0 Pa
-5 mbar
-72,52 mpsi
-2,007 inH2O
-50,98 mmH2O
-500,0 Pa
5 mbar
72,52 mpsi
2,007 inH2O
50,98 mmH2O
500,0 Pa
mbar:
3 decimal
places
mpsi:
2 decimal
places
inH2O:
3 decimal
places
mmH2O:
2 decimal
places
Pa:
1 decimal place
106
HR_OUT1_IN_LOW_LIMIT_H
107
HR_OUT1_ERR
Error type (higher, lower
or low/high)*
RW
uint16
1
0
2
N.A.
108
HR_OUT1_HIGH_LIMIT
Retransmission upper
limit
RO
int_32
5 mbar
72,52 mpsi
2,007 inH2O
50,98 mmH2O
500,0 Pa
-5 mbar
-72,52 mpsi
-2,007 inH2O
-50,98 mmH2O
-500,0 Pa
5 mbar
72,52 mpsi
2,007 inH2O
50,98 mmH2O
500,0 Pa
mbar:
3 decimal
places
mpsi:
2 decimal
places
inH2O:
3 decimal
places
mmH2O:
2 decimal
109
HR_OUT1_HIGH_LIMIT_H
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