I/O Cards


  • VME 6U Board
  • Based on VME64x Architecture
  • Available in three variants – Commercial, Air-Cooled, Conduction-Cooled
  • Vibration, Shock resistant
  • Complies with IEEE 1101.2 mechanical specifications
  • Programmable Interrupter: 7 Levels
  • Dimensions- 233.35 x 160mm
  • Isolation and non-isolation options available
  • Input Voltage: TTL and Open Collector
  • Optional – Two Asynchronous Channels of RS-232 or RS-422 or 1 each of RS-232/422 Serial Interfaces
  • Programmable Baud Rates up to 115.2 k/Bauds
  • Driver and high-level API libraries for Windows XP, Linux, RT-Linux, LynxOS 4.0 and VxWorks 5.5

The AT family of 6U VME Discrete I/O boards are designed to provide users with a high degree of reliability and flexibility to meet input-output requirements. The AT-VME-DIO boards provide an economical method for isolation and interfacing of I/O signals to the VME bus. Built in optical relays are used for each channel. This eliminates the need for external relay panels. They are ideally suited for stringent military and airborne applications. On-board relays isolate all the inputs, outputs and the VME bus from each other against all sorts of transients emanating from ground loops etc. The AT-VME-DIO provides 16 channels of isolated inputs and 16 channels of isolated outputs. The voltage levels supported are TTL and Open Collector voltages. Also available on the board are 2 serial asynchronous RS-422 channels. These have a programmable baud rate upto 115.2 k/ Bauds.


The AT-VME-DIO boards meet the VME 64x standard and are available in a 6U form factor. The boards are available in three variants – Commercial, Air-Cooled & Conduction-Cooled. It is designed to work in units meeting MIL-STD-461C for EMI/EMC and MIL-STD-810F for airborne applications. All the components used are of MIL grade quality as per airborne application requirements in the conduction-cooled version. Front panel and Rear I/O connectivity options are provided for commercial and air-cooled boards. Conduction-cooled boards are available with Rear I/O connectivity only.

Discrete I/O

  • 16 Channels of Opto-Isolated Inputs
  • 16 Channels of Opto-Isolated Outputs
  • One opto-coupler / channel
  • Minimum isolation of 500 V
  • Non-isolated VME boards also available
  • Voltage level : TTL Logic, Open Collector 0-48V
  • Open Collector 0-48V
  • Rear I/O Connectivity on P2

Serial Interface – Optional

  • 2 RS-232 or 2 RS-422 or 1 each of RS-232/422 Asynchronous Channels
  • Programmable standard baud rates up to115.2 K/Bauds

Mechanical Format

  • Commercial/Development version- Standard VME
  • Air-cooled version- As per ANSI/VITA 1-1994
  • Conduction cooled version- As per IEEE 1101.2


  • Dimensions- 233mm x 160mm
  • IEEE 1101.2 single-slot board with 0.8-inch centers

VME Interface

  • VME 64x, 6U form factor
  • A24/D16 interface


  • Consumption: 2.25 watts
  • 5V @ 450mA


  • Programmable interrupter 7 levels
  • Samples & compares periodically the status of the I/O channels
  • For every change, VME bus interrupt is asserted

Software Support

  • Driver and high-level API libraries for Windows XP, Linux, RT-Linux, LynxOS 4.0 and VxWorks 5.5
  • Virtual Instrument Panels for interactive control of Discrete I/O and UART features
  • Self-test and built-in test features provided


  • Built-In-Test (BIT) of all on-board TTL chips
  • Wrap around loops to verify correct board operation


A B C +
2 Air Cooled Conduction Cooled
3Operating Temperature0°C to +60°C-40°C to +85°C



  • Series ‘C’: Commercial/Development Version
  • Series ‘A’: Air-Cooled Version
  • Series ‘M’: Military / Conduction-Cooled Version


  • 1 year limited warranty
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