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MIW-DPD-X-EN-001 - 09 / 04 / 2020
10 - 13
2.
Sensor module 2:
2.1
Disconnect the nozzles and make sure they are not clogged.
2.2
There are two options for starting the calibration process:
■
Either write “1” in holding register 90 or press tact switch SW2 for about 5
seconds until the blue LED4 on the printed circuit board blinks twice and release
it. During the calibration procedure the display will indicate C 2 - C (
Fig. 7 b
).
2.3
After the calibration is done, the blue LED4 will blink twice once again to
indicate that the calibration procedure has finished.
Fig. 7 Calibration indication
7 a Calibration indication sensor module 1
7 b Calibration indication sensor module 2
.
ATTENTION
Make sure that the nozzles are disconnected and unobstructed.
Reset of Modbus holding registers procedure:
1.
There are two options for starting the Modbus reset process:
■
Write ‘1’ in holding register 10 or press tact SW1 until the blue LED3 on the
printed circuit board blinks two times and do not release the switch until LED3
blinks again three times.
2.
All Modbus registers, except the communication related registers 1—9, are reset
to their default values (factory pre-set). During the Modbus reset procedure the
display will indicate “H” (see
Fig. 8
).
Fig. 8 Sensor calibration and Modbus holding register reset tact switches and
indication
SW2
SW1
ATTENTION
Press and hold the tact switch until both LEDs on the PCB blink twice and hold
it until both LEDs blink again three times. If the tact switch is released before
the LED blinks again three times, the sensor will have carried out a calibration
procedure instead of Modbus registers reset procedure.
Display settings
The display is enabled via writing “1” in holding register 91 (Measurement readout).
Writing “0” will disable the display.
When the display is enabled, its mode depends on the value in holding register 61
(Operating mode). There are three display modes activated via writing the relevant
figure in holding register 61 (Operating mode sensor 1) and 81 (Operating mode
sensor 2). See the table below:
DUAL DIFFERENTIAL PRESSURE
TRANSMITTER WITH DISPLAY
DPD
