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MIW-RSTHM-2-EN-000 - 15 / 01 / 2019
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Optional settings
If your unit is the first or the last unit on the Modbus RTU network (see
Example 1
and
Example 2
), enable the NBT resistor via 3SModbus or Sensistant (
Holding Register 30
).
If your device is not an end device, leave the NBT disabled (default Modbus setting).
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
ATTENTION
t
Do not expose to direct sunlight!
OPERATING INSTRUCTIONS
Calibration procedure:
Both the relative humidity and temperature sensor elements are factory calibrated.
Recalibration is not necessary.
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
LED indications
1.
When the green LED is on, the measured value (temperature or relative humidity)
is between the minimum and maximum alert range values (
Fig 6 - 1
).
2.
When the yellow LED is on, the measured value (temperature or relative humidity)
is in the alert range (
Fig 6 - 2
).
3.
When the red LED is on, the measured value (temperature or relative humidity)
is below the minimum measurement range value or above the maximum value.
Blinking red LED indicates loss of communication with a sensor (
Fig 6 - 3
).
RSTHM-2
COMBINED T AND RH
ROOM TRANSMITTER
