Data Acquisition


  • 4-Port DS18B20 Sensor Input Module
  • 2/3-wire DS18B20 Wire Connection
  • Max. 20 Sensors per Port
  • Up to 100 meters per port with Daisy-Chain Wiring
  • Measures Temperatures from -55 to +125°C
  • ±0.5°C Accuracy from -10 to +85°C


The M-2004 is a digital temperature sensor module that provides four ports for 2- or 3 wire DS18B20 digital temperature sensor input. The DS18B20 temperature sensor has a high accuracy of ±0.5°C when measuring temperatures between -10 and + 85°C, with a total measurement range of between -55 and +125°C. Up to 20 DS18B20 sensors can be connected to each port on the M-2004 module in a daisy-chain arrangement with a maximum wiring distance of 100 meters. The M-2004 module is fully RoHS compliant, and features 4 kV ESD protection as well as 3000 VDC intra-module isolation.


    • Temperature Measurement
    • Environment Monitoring
    • Tunnel Monitoring
    • Building Monitoring


 CPU Module
 Watchdog Timer Module, Communication (Programmable)


 Intra-module Isolation 3750 VDC


 EMS Protection
 EFT (IEC 61000-4-4) ±2 kV for Power Line
 ESD (IEC 61000-4-2) ±4 kV Contact for Each Terminal
±8 kV Air for Random Point
 Surge (IEC 61000-4-5) ±2 kV for Power Line


 LED Indicators
 Status 1 x Power and Communication


 Temperature Measurement
 Range -55 °C to +125 °C


 Analog Input
Ports 4
Sensor Type DS18B20
Sensors per Ports 20
Sensor Wiring Cables Length Max. 100 m per Port
Resolution 12-bit
Accuracy ±0.5 °C (See Note 1)
Sampling Rate 1 Hz


 COM Ports
 Ports 1 x RS-485
 Baud Rate 1200 ~ 115200 bps
 Data Format (N, 8, 1), (N, 8, 2), (E, 8, 1), or (O, 8, 1)
 Protocol Modbus RTU, DCON
 Bias Resistor 1k Ω (DIP switch selectable)


 Reverse Polarity Protection Yes
 Input Range +10 ~ +48 VDC
 Consumption 0.5 W


 Dimensions (mm) 33 x 117 x 88 (W x L x H)
 Installation DIN-Rail Mounting


 Operating Temperature -25 ~ +75 °C
 Storage Temperature -30 ~ +80 °C
 Humidity 10 ~ 95% RH, Non-condensing




CA-TP1-M100-L020    CA-TP1-M200-L020


 M-2004     CR  4-port DS18B20 Temperature Sensor Module using the DCON and Modbus Protocols (RoHS) 1