DGH D1400M Modbus with RTD Input Module Series

  • DGH

Product Features

  • 8 conversions per second
  • User selectable °C or °F
  • Accuracy: ±0.3°C maximum
  • Resolution: ±0.1° (C or F)
  • Common mode rejection: 100dB at 50/60Hz
  • Input connections: 2-, 3- or 4-wire
  • Lead resistance effect: 3-wire – 2.5°C per Ω of imbalance, 4-wire – negligible
  • Max lead resistance: 50Ω
  • Automatic linearisation and lead compensation
  • Temperature range of -25°C to +70°C


  • Non-compliant

The D1400M RTD input module is part of the DGH’s D1000M Modbus sensor to computer interface data acquisition module family. This input module converts the RTD temperature sensor input signal from the choice of three different RTD types (0.00385, 0.00388 and 0.00392) to digital data, linearizes and scales it in °C or °F, and communicates the values using the Modbus RTU protocol to give digital output. The D1400M RTD input module also contains one open-collector digital output which may be controlled by the host computer and used to control, for example, solid-state relays. For extra security, it utilises a non-volatile EEPROM (Electrically Erasable Programmable Read Only Memory) to store all user-selectable settings, meaning the values are maintained in the event of power loss. The modules are designed to be compatible with all popular computers utilising RS-232C or RS-485 ports and no software is necessary to start using them, although the utility software is provided. Upon startup, a simple Modbus RTU command can be used to setup desired baud rate, parity and other parameters. The D1400M can be mounted on a DIN-rail if required (MK-1 mounting kit required) and can be combined with other D1000M/D2000M modules to provide complete customised data acquisition system for given application.

  • Analog-to-digital RTD input module
  • Choice of RS-232 or RS-485 output
  • Choice of 3 different RTD types: 0.00385, 0.00388 or 0.00392
  • Communicates using Modbus RTU protocol
  • User-selectable features include °C or °F, baud rate, parity type, channel address and others
  • Accuracy: ±0.3°C maximum
  • Resolution: ±0.1°(C or F)
  • Common mode rejection: 100dB at 50/60Hz
  • Autozero and auto-calibration
  • Up to 246 multidrop modules per host serial port (RS-485 only)
  • 2, 3 or 4 wire input connections
  • Maximum lead resistance of 50Ω
  • Excitation current of 0.25mA
  • Input burnout protection to 120Vac
  • Lead resistance effect of 2.5°C per Ω of imbalance for 3-wire option, negligible for 4-wire option.
  • Automatic linearisation and lead compensation
  • 1 open-collector digital output
  • Power requirements: Serial = 0.75W
  • Temperature range -25°C to +70°C

The applications for the D1400 data acquisition modules include:

  • Data monitoring
  • Data loggers
  • PLC’s
  • Process controllers and instrumentation

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Weight 0.00000 kg
Dimensions 27.94 x 62.23 x 91.44mm
Alpha Value

0.00385 (-200°C to +850°C), 0.00388 (-100°C to +125°C), 0.00392 (-200°C to +600°C)



Number of Channels



Power Requirements

Series / Model


DGH D1000M Technical Library

We are pleased to provide you with a range of additional content including videos, product datasheets, case studies, white papers and application notes for your reference. Please see below for the latest content available:



DGH D1000M Series Datasheet
DGH D1000M Series User Manual
Command Set Protocol for D1000M Series
Register Map for D1000M Series
Register Map for D1700M Series
MODBUS RTU Function List
MODBUS RTU Protocol Overview
  • DGH

DGH D1400M Modbus with RTD Input Module Series

Please be advised that due to the ongoing supply issues with raw materials affecting the global electronics industry, as well as an increase in orders received by our manufacturing partners, a large number of products are facing increased lead times in recent months. For the latest lead time and stock availability, please contact one of our engineers who will be happy to discuss lead times further and the potential for alternative parts.