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MIW-DSMFX-2R-EN-000 - 05 / 07 / 2019
9 - 12
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
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.
CAUTION
Do not expose to direct sunlight!
OPERATING INSTRUCTIONS
Calibration procedure:
Sensor calibration is not necessary.
In the unlikely event of CO
2
sensor element failure, this component can be replaced.
All sensor elements are calibrated and tested in our factory.
Bootloader
Thanks to the bootloader functionality, the sensor firmware can be updated via
Modbus RTU communication. To enter ‘Boot mode , put a jumper onto pins 3 and
4 of the P1 header and restart the power supply (see
Fig. 5
). Once ‘Boot mode’ is
activated, the firmware can be updated via SM Boot application (part of 3SModbus
software suite) or Sensistant.
Fig. 5 P1 header
1 2 3 4 5
Put a jumper onto pins 1 and 2 and
wait for at least 5 seconds to reset the
Modbus communication parameters
1 2 3 4 5
Put a jumper onto pins 3 and 4 and restart
the supply to enter bootloader mode
DSMFX-2R
MULTIFUNCTIONAL
DUCT TRANSMITTER
