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Novus Automation UK | Modbus I/O  | DigiRail |  DigiRail-4C

DigiRail-4C, Channel Digital Input/Counter Module; Modbus I/0

DigiRail-4C, Channel Digital Input/Counter Module; Modbus I/0

Price: (4 or fewer items) £64.50 (Excluding VAT at 20%)
Price: (5 to 9 items) £61.50 (Excluding VAT at 20%)
Price: (10 to 24 items) £58.00 (Excluding VAT at 20%)
Price: (25 or more items) £55.00 (Excluding VAT at 20%)



Product Options

Part Numbers and Commodity Code

Commodity Code
The Commodity Code for this family of Products is:-

  • 9025.80.00
Part Numbers
The part numbers and descriptions for this device and any variants are as follows:-

  • 8811400101 DigiRail-4C RS485 Four counters/digital inputs


The DigiRail-4C has 4 inputs designed to accept up to four DC Digital inputs up to 30Vdc. For volt free contacts a "wetting voltage" will need to be applied, for example the 24Vdc power supply for the unit could be used. Its compact DIN Rail mountable form allows it to be mounted almost anywhere and the DigiRail-4C connects to Serial ModBus-RTU networks on standard 2 wire RS485. The DigiRail-4C is fully configurable and can be used with any PLC, Data acquisition software or SCADA systems that support the ubiquitous ModBus-RTU protocol.

The DigiRail-4C inputs are electrically isolated from the serial interface and the module supply thus avoiding interference.
The DigiRail-4C is easily configured and calibrated using the free DigiConfig software for Windows (if you need a RS485 converter the Novus USB i485 will be an appropriate addition).
The DigiConfig software also features device detection technology, automatically detecting all DigiRail devices on the modBus network allowing quick and easy configuration.


  • Inputs: 4 Digital Inputs: Logic level 0 = 0 to 1 Vdc; Logic level 1 = 4 to 35 Vdc
  • Internal Input current limitation: approximately 5 mA
  • Maximum count frequency: 1000 Hz for signals with square wave and working cycle of 50%. Input 1 can be configured for counting signals of up to 100 kHz.
  • Counting capacity (per input): 32 bits (0 to 4.294.967.295)
  • Feed: 10 to 35 Vdc / 50 mA maximum. Internal protection against polarity inversion.
  • Electrical insulation between inputs and supply/serial port: 1000 Vdc for 1 minute
  • Serial communication: RS485 at two wires, Modbus RTU protocol.
  • Configurable parameters:
    • Communication speed: from 1200 to 115200 bps; Parity: even, odd or none
    • Key for restoring communication parameters: The RCom key, at the front panel, will set the device in diagnostics mode (address 246, baud rate 1200, parity even, 1 stop bit), able to be detected and configured by the DigiConfig software.
  • Frontal light indicators for communication and status:
  • DigiConfig Software configurator for Windows® 98, 2000, XP, NT or Vista
  • DIN Rail Mountable
  • Compact Enclosure: 19x72x78 mm
Please note: The Digirail 4C does not retain count after power down.


Options coloured green are available ex-stock and can be despatched immediately.

Associated products

Click here to add a USB-i485 to your order.


People who bought this item also bought:
1. Digirail-2A, 2 Channel Universal Analogue Input Module; Modbus I/0
2. DigiRail-2R, 2 Digital Relay Output Module; Modbus I/0
3. Novus USB-i485, USB converter to dual RS485 Isolated Ports

DigiRail-4C Manual (17-10-13)

Click here to download the DigiRail-4C Manual (17-10-13)
DigiRail-4C Communications Manual (17-10-13)

Click here to download the DigiRail-4C Comms Manual (17-10-13)
DigiRail-4C Declaration of Conformity (17-10-13)

Click here to download the DigiRail-4C Declaration of Conformity (17-10-13)
DigiConfig Configurator V1.61 (1-10-2013)
DigiRails, DigiGate, Transmissor RHT-485-LCD, AirGate-Modbus, RHT-Air and AirGate-GPRS configuration software. Windows® 8 compatible.
Click here to download the DigiConfig Configurator V1.61 (1-10-2013)

Novus Automation UK | Modbus I/O  | DigiRail |  DigiRail-4C