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BMD
x
Parameter
Abbrevi-
name
ation
0
Temperature
T
1
OccupancyR-
OR_s
ate_sum
OccupancyR-
2
OR_f
ate_fine
3
OccupancyR-
OR_c
ate_chunk
10
Clean Counter
cln_cnt
16
Chunk Counter chunk_cnt -
Sequential out-
40
-
put
100 4 mA
-
101
12 mA
-
102
20 mA
-
Tab. 2: Numerical code for output parameters of the analog current
outputs
Key parameters can be output sequentially via the analog in-
terface. In this case the sensor must be configured accord-
ingly. The correspondingly configured sensor outputs the key
parameters as shown:
Particle release
Current
Start
Fig. 5: Sequential output of values via analog interface
8
Bühler Technologies GmbH
Unit
Explanation
Sensor temperat-
°C
ure
%
Default Sum sig-
nal for OR_f and
OR_c
Occupancy rate of
%
the sensor surface
with fine particles
%
Occupancy rate
with big particles
(chunks) 0...100 %
in 10% increments
Number of auto-
matic cleanings
since the last
-
manual reset
("SONew" com-
mand)
Number of chunks
detected
Output of values
-
0, 1, 2, 3, 10 and 16
separated by time
-
Output fixed to 4
mA
Output fixed to 12
-
mA
-
Output fixed to 20
mA
Start
4.2.5 Calibration
The output values can be calibrated and calculated with the
following formulas:
Output quantity
Output
X
range
Temperature (T) -20...100 °C
OccupancyR-
0...100 %
ate_sum (OR_s)
OccupancyR-
0...100 %
ate_fine (OR_f)
OccupancyR-
0...100 %
ate_chunk
(OR_c)
Clean Counter
0...64
(cln_cnt)
Chunk Counter
0...10
(chunk_cnt)
enabled or
Particle release
disabled
Tab. 3: Calculating measurements from current
5 Operation and Control
NOTICE
The device must not be operated beyond its specifications.
For a detailed description of the configuration and/or sensor
operation, please refer to the full operating instructions on
our website at www.buehler-technologies.com.
5.1 RS232 Communication
Communication with the sensor takes place either via serial
RS232 port, CANopen or via an analog 4...20 mA output.
The sensors come standard with RS232 port enabled. In this
mode it's quite easy to configure the analog interface and to
configure the CANopen communication parameters. If neces-
sary, a RS232 command can then be used to switch to CAN-
open interface (command "SComMode"), which will be ap-
plied after restarting the sensor.
We recommend the software ("CMSensorDataViewer" and
"CMSensorConfig") available for download at www.buehler-
technologies.com to configure and/or operate the sensor via
PC. The software provides easy access to sensor data and con-
figuring the sensor without the use of terminal programs
when operating the sensor via PC.
If the sensor is in CANopen mode, it can be permanently
changed to the RS232 port with the corresponding entry in the
Time
object directory, which will be applied after restarting the
sensor.
If the sensor is in CANopen mode, the RS232 port can also be
changed temporarily. In this case, the sensor must be connec-
ted to the RS232 port configured accordingly and whilst boot-
ing, press the pound key (#) until the sensor responds with its
ID. If the sensor does not respond within 10 seconds after con-
necting power, repeat the process.
Quantity equation
For-
mula
°C
U / V
( )
.
-50 °C
X
=
(5-1)
7500
A
R / Ω
%
U / V
(5-2)
( )
.
-25 %
X
=
6250
A
R / Ω
%
U / V
( )
.
-25 %
X
=
6250
(5-3)
A
R / Ω
%
U / V
(5-4)
( )
.
-25 %
X
=
6250
A
R / Ω
U / V
1
( )
.
-16
X
=
4000
(5-5)
A
R / Ω
U / V
1
( )
(5-6)
.
-2,5
X
=
625
A
R / Ω
X = 4 mA = disabled
X = 20 mA = enabled
BX150103 ◦ 03/2021
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