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. Optical-relays, which are built-in, are provided for each I/O channel. These eliminate the expenses incurred due to the usage of external relay panels. They are ideally suited for stringent military and airborne applications.

On-board relays isolate all the inputs, outputs and the VMEbus from each other against all sorts of transients emanating from ground loops etc. The AT-VME-DIO provides 32 channels of isolated inputs and 32 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 up to 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 and Conduction-Cooled versions. 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

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


  • 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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