Wireless Modbus Gateway – Maltec-T MTWG1


  • Supports up to 16 MTW1
  • Up to 4km or 2km Distance (LoS)
  • Real-time transmission
  • 1 Second network refresh time
  • RS-485 interface with Modbus protocol
  • 8 x analog outputs (4…20mA)
  • On-site battery and RF signal strength verification

Dpstar Group is the largest manufacturer of thermocouples based in Malaysia. We design and manufacture a complete line of high-quality standard and custom temperature sensors including thermocouples, RTD’s, thermowells, and float switches as well as a wide selection of temperature accessories. Through our engineering capabilities and 30 years of experience, our trademark brand Maltec-T is the only CE-certified manufacturer for thermocouples in Malaysia. With extensive experience, unique technology, and hard commitment, we become one of the best quality suppliers in the temperature sensors field. We offer a full range of design services to provide you with the benefit of our knowledge and experience.

The Maltec Wireless Modbus Gateway MTWG1 is specifically designed to meet the most rigorous requirements of operation in the industrial process environments. Due to its reduced dimensions, it can be easily installed in junction boxes or in the control cabinet.

It receives the information transmitted by the Universal Wireless Temperature Transmitter MTW1 and makes it available on the RS485 interface with Modbus protocol. Additionally, the first 8 addressed wireless transmitters can be read through the 4 to 40mA analog outputs.

Dimensional Drawings & Interface Design

Electrical Connections


Range¹ Up to 4 Km LoS, 868 MHz, 27 dBm (500mW) Up to 2 Km LoS, 2,4 GHz, 10 dBm (10mW)
Radio transmit power 0 to 27 dBm² -10 to 18 dBm²
Radio receiver sensivity -97 to -109 dBm² -91 to -108 dBm²
Frequency band 868 to 870 MHz² 2.4 to 2.5 GHz²
Radio channels 16
Input/Output impedance 50 Ohm
Voltage supply 12 VDC to 24 VDC +/- 10%
Current consumption 70 mA @ 12 VDC / 45 mA @ 24 VDC (@ 25 ºC)
Power consumption 0.85 W @ 12 VDC / 1.1 W @ 24 VDC (@ 25 ºC)
Power up time 900 ms
Protocol Modbus RTU
Baud rate [4800; 115200] Kbps
Galvanic isolation 1KV
Output signal 4 to 20 mA
Max. load 360 Ω @ 12VDC / 1 KΩ @ 24VDC
Out of range [3.2;4.0] mA and [20.0;20.2] mA
Fault signal (e.g. sensor fault) 3.1.mA or 20.4 mA
Sample cycle 1s to 24h (configurable)
Protection Against reversed polarity ; Surge protection
Power on or reset initial value Last written value
Wireless Network ID 0x00
Modbus Slave Address 0x00
Baud rate 9600 bps
Parity None
Stop Bits 2
Material PA – UL 94 V0
Color RAL 7035
Weight 120 g
Cross section 2.5mm²
Protection type IP40
Antenna connection SMA (868 MHz) / SMA-RP (2.4 GHz)
Ambient temperature range -40 to 80 ºC (-40 to 176 ºF) -20 to 80 ºC (-4 to 176 ºF)
Storage temperature range -40 to 80 ºC (-40 to 176 ºF) -20 to 80 ºC (-4 to 176 ºF)
Relative humidity ≤ 95 %, without condensation


Maltec-T MTWG1 – Wireless Modbus Gateway_DpstarGroup


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