Sentera Controls HPD, Mounting And Operating Instruction

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Fig. 5 Pull-up resistor jumpers
JP2 JP1
■
When JP1 and JP2 are disconnected, the output type is Open collector. See Fig. 6
PWM (Open collector) connection example.
■
Only when JP1 and JP2 are not connected and the analogue outputs (AO1 and
AO2) are assigned as PWM output (via holding registers 54 and 74 - see the
Modbus Map), external pull-up resistors are used.
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
VERIFICATION OF INSTALLATION
After switching on the power supply, the green ON/OFF LED on the printed
circuit board must be on solid indicating that the unit is powered (
Fig. 7 Operating
indication ). If the LED is OFF, check the connections.
DUAL DIFFERENTIAL
PRESSURE TRANSMITTER
HPD