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MIW-DPD-X-EN-001 - 09 / 04 / 2020
9 - 13
Fig. 6 PWM (Open collector) connection example
PWM GND
External voltage
source (5—30 VDC)
External pull-up
resistor
50—100 kΩ
Optional settings
To assure correct communication, the NBT needs to be activated in only two devices
on the Modbus RTU network. If necessary, enable the NBT resistor via 3SModbus or
Sensistant (
Holding register 9
).
Example 1
Example 2
RX
ТX
NBT
NBT
Slave 2
Master
Slave n
Slave 1
Slave 2
Slave 1
RX
ТX
NBT
NBT
Master
Slave n
NOTE
On a Modbus RTU network, two bus terminators (NBTs) need to be activated.
9.
Put back the front cover and secure it with the screws.
10.
Customise the factory settings to the desired ones via the 3SModbus software
or the Sensistant configurator. For the default factory settings, see
Modbus
register map
.
For the complete Modbus register data, refer to the product Modbus Register
Map, which is a separate document attached to the article code on the website
and contains the registers list. Products with earlier firmware versions may not be
compatible with this list.
NOTE
OPERATING INSTRUCTIONS
NOTE
Calibration procedure (Fig. 7):
1.
Sensor module 1:
1.1
Disconnect the nozzles and make sure they are not clogged.
1.2
There are two options for starting the calibration process:
■
Either write “1” in holding register 70 or press tact switch SW1 for about 5
seconds until the blue LED3 on the printed circuit board blinks twice and release
it. During the calibration procedure the display will indicate C 1 - C (
Fig. 7 a
).
1.3
After the calibration is done, the blue LED3 will blink twice once again to
indicate that the calibration procedure has finished.
DUAL DIFFERENTIAL PRESSURE
TRANSMITTER WITH DISPLAY
DPD
