Input Output Units

  • The I/O Unit enables the monitoring and/or control of Analog, Digital Inputs & Outputs of devices through MODBUS RTU protocol.
  • A single box has 8 Analog, 8 Digital inputs and 4 potential free Relay contacts and requires only the setting up of Unit ID through a DIP Switch before use.
  • Using multiple units on the RS 485 Bus, up to 2000 Inputs and 1000 Output contacts can be easily realized.
  • Using our RS 485 to GPRS / WiFi / Ethernet Gateway products, monitoring and control of these units may be done over the wireless network / Internet etc.

Features & Specifications

Serial Interface
Interface RS 485
Data Rates 9600
Data Bits 8
Parity No Parity
Stop Bits 1
Flow Control None
Protocol MODBUS
MODBUS ID Setting Using 8 position DIP Switch
ID Range 1 to 255
Isolated Digital Inputs
Number of Inputs 8
Digital Input Voltage 5 – 24 V DC or 4 – 20mA, Selectable using on board Jumpers
Isolation 3750V RMS
Analog Inputs
Number of Inputs 8
Analog Input Voltage 0 – 12 V DC
Analog Input Type Single ended or Differential or 4 – 20mA Selectable
Relay Outputs
Number of Outputs 4
Relay Contacts Normally Open and Common
Contact Rating 1 A at 120 V AC or 2 A at 24 V DC
Operating 0 °C to 55 °C
Storage -40 °C to 85 °C
Input Voltage 8 to 24 V DC
Current 250 ma ~
Protection Fuse and reverse Polarity protection
Power Red
TXD Yellow
RXD Green
Dimensions (LxWxH) 140mm(L) x 130mm(W) x 31mm(H)
Weight 500g
Warranty 12 Months for the box product


  • Industrial Control & Automation.
  • Environment monitoring & control.
  • Plant Automation.
  • Energy monitoring & management.

  • Building Management System.(BMS)
  • Remote Data Logging.
  • ATM Management.
  • Mobile Tower Management & many
Model Number Description
I/O Unit RS 485 MODBUS Input Output Unit

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