Senzomatic FHT-I

Installation

1. 1Lay the FHT-I sensing cable flat on the floor in the target area, such as behind a washing machine or under a kitchen cabinet.
2. 2Wire the FHT-I to the RS-485 bus of your ModbusCloud gateway (MCG or MLP series), connecting A, B, and GND terminals correctly.
3. 3Set the Modbus slave address on the FHT-I to a unique value that does not conflict with other devices on the bus.
4. 4Configure the gateway RS-485 port for 19200 baud, 8 data bits, odd parity, and 1 stop bit to match the FHT-I defaults.
5. 5Import the Senzomatic FHT-I template from the ModbusCloud library and assign it to the correct gateway and slave address.
6. 6Verify that live readings for temperature, humidity, and flood counter appear on the ModbusCloud dashboard before leaving the site.

Things to watch for

01

I see incorrect or garbled readings for temperature and humidity. What could be wrong?

All FHT-I registers are float32 with big-endian word swap (byte order 8-7). Make sure your gateway is configured for this byte order. A mismatch will produce nonsensical values.

02

Can I use the humidity-based early leak detection in a bathroom?

No. Senzomatic advises against enabling humidity-based leak detection in areas where humidity naturally rises and falls repeatedly, such as bathrooms. The rapid humidity changes will cause false alerts.

03

The sensor does not respond on the Modbus bus. What should I check?

Verify that the baud rate is set to 19200 with odd parity (8E1) on both the sensor and the gateway. Also confirm that the A and B RS-485 lines are not swapped and that the slave address matches the template configuration.

04

Is a bus termination resistor required for the FHT-I?

If the FHT-I is at the end of a long RS-485 bus run, add a 120 ohm termination resistor across the A and B lines. For short cable runs with only a few devices, termination is usually not necessary but recommended for reliability.

Registers (9)

9 read / 0 write

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