Delta OHM PMBsense-A, Operating Manual

Page: 15 / 24

PM[B]sense
- 15 -
V1.3
6 MODBUS-RTU PROTOCOL
By default, the instrument has MODBUS address
1
and communication parameters
19200, 8E1. The address and the communication parameters can be changed by using
the appropriate serial commands of the proprietary protocol or, alternatively, directly
with MODBUS commands by changing the value of the Coils and Holding Registers de-
scribed later.
The MODBUS-RTU protocol, if set as the operating protocol (default), is active after 10
seconds from the instrument power on.
In order to change the instrument configuration using the MODBUS-RTU protocol, the
value 1 must be written first in the
Coil with address 1.
Below is the list of registers.
Input Registers:
Address Description Format
0 PM1.0 in N° of particles/ml.
Measurement averaged according to what is set with CPS
command or MODBUS holding register 19.
16-bit Integer
1 PM2.5 in N° of particles/ml.
Measurement averaged according to what is set with CPS
command or MODBUS holding register 19.
16-bit Integer
2 PM10 in N° of particles/ml.
Measurement averaged according to what is set with CPS
command or MODBUS holding register 19.
16-bit Integer
3 PM1.0 in µg/m
3
(x10).
Measurement averaged according to what is set with CPS
command or MODBUS holding register 19.
16-bit Integer
4 PM2.5 in µg/m
3
(x10).
Measurement averaged according to what is set with CPS
command or MODBUS holding register 19.
16-bit Integer
5 PM10 in µg/m
3
(x10).
Measurement averaged according to what is set with CPS
command or MODBUS holding register 19.
16-bit Integer
6 PM1.0 in N° of particles/ml.
Measurement averaged over 10 s and updated every sec-
ond.
16-bit Integer
7 PM2.5 in N° of particles/ml.
Measurement averaged over 10 s and updated every sec-
ond.
16-bit Integer
8 PM10 in N° of particles/ml.
Measurement averaged over 10 s and updated every sec-
ond.
16-bit Integer
9 PM1.0 in µg/m
3
(x10).
Measurement averaged over 10 s and updated every sec-
ond.
16-bit Integer
10 PM2.5 in µg/m
3
(x10).
Measurement averaged over 10 s and updated every sec-
ond.
16-bit Integer