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MIW-HPS-X-2-EN-000 - 14 / 03 / 2017
8 - 15
ATTENTION
The status of the LEDs can be checked only when the unit is energised. Take the
relevant safety measures!
The Network Bus Terminator (NBT) is controlled via Modbus RTU. By default the
NBT is disconnected. For more information, see the Modbus Registers Maps below.
If your unit starts or terminates the network, activate the NBT via Modbus RTU, see
the examples below.
Example 1
Example 2
Slave 1
RX
ТX
NBT
NBT
NBT
Slave 2
Master
Slave n
Slave 2
Slave 1
RX
ТX
NBT
NBT
Master
Slave n
NOTE
Connect the terminator only in the two most distant units on the network line!
OPERATING INSTRUCTIONS
Calibration procedure:
1.
Disconnect the nozzles.
2.
There are two options for starting the calibration process:
Either write “1” in holding register 40 or press button SW1 for 4 seconds until
the green LED2 and yellow LED3 on the printed circuit board blink twice and
release it (see
Fig. 7
Sensor calibration and Modbus register reset tact switch and
indication
).
3.
After 2 seconds the green LED2 and yellow LED3 will blink twice once again to
indicate that the calibration procedure has finished.
Fig. 7 Sensor calibration and Modbus register reset
tact switch (SW1) and calibration indication
NOTE
Press and hold the button until both LEDs on the PCB blink twice and hold it until
both LEDs blink again three times. If the button is released before both LEDs blink
again three times, the sensor will have carried out a calibration procedure instead
of Modbus registers reset procedure.
DIFFERENTIAL PRESSURE
TRANSMITTER
HPS-X -2
