VMEbus optocoupled 64 channel input board with voltage stage per channel.

Extensive Software Support

BSPs for the leading real-time operating systems - UNIX, SUN, WIN, etc.


The CM-DI-40 is a general purpose 64 channel optocoupled input VMEbus board, incorporating features most demanded in today's first class military & industrial applications.

CM-DI-40 - Discrete Input

The board implements a complete input voltage stage per channel, featuring overvoltage protection, galvanic isolation, rectifier & filter and easy configuration to accept a wide range of AC/DC voltage levels.

The metallic layer within the PCB benefits heat dissipation & uniform component temperatures, thus increasing component longevity & module MTBF.

CM-DI-40 - Discrete Input

Incorporating Built-In-Test circuitry for testing all on board TTL chips using wraparound loops which read-back channel status to verify correct module operation.

Military versions with thermal overlay greatly improve capability to withstand shock & vibration.

The CM-DI-40 offers a highly flexible I/O cabling solution using VME64x connectors on both front panel and P2. Both connectors have identical pin-out.

CM-DI-40 - ATR Chassis

All versions are compatible at the function level, Industrial versions allow low cost software development.


CM-DI-40/C - Commercial

C: Commercial range >> Implements low cost Commercial plastic IC's rated for 0 to +70°C. Continuous board operation from 0 to +60°C. Class II industrial quality connectors. Storage from -10 to +85°C.


CM-DI-45/C - Industrial

I: Industrial range >> Manufactured with Industrial range plastic or ceramic IC's rated for -25 (-40) to +85°C. Continuous module operation from -20 to +75°C. Class II industrial quality connectors. Storage from -40 to +100°C.


CM-DI-40/R+ - Military Rugged

R+: Military Rugged+ range >> Implements ceramic IC's rated from -55 to +125°C. Class I MIL-C-55302 connectors. Conduction cooled PCB with thermal overlay. Operation from -40 to +85°C. Storage from -55 to +125°C.

Military 883

CM-DI-40/883 - Military 883

883: Military 883 range >> Manufactured with conduction cooled PCB & MIL-STD-883 B/C military ceramic parts (-55 to +125°C). Class I MIL-C-55302 connectors. Operation from -50 to +90°C. Storage from -55 to +125°C.

MIL-STD Components

  • MIL-STD-810D Temperature (Methods 501.2 & 502.2)
  • -55°C to +125°C ceramic military ICs
  • Military Class V Printed Circuit Board
  • MIL-C-55302 Class I Connectors
  • MIL-R-39016 Built-In-Test Relays.
  • MIL-STD-883 FPGAs & TTL chips.
  • MIL-E-5400 Class 1B (Temp. & Altitude)
  • MIL-STD-810D Shock & Vibration (Methods 514 & 516)
  • No PCB tracks in external layers
  • MIL-STD-810D Saline Fog & Dust (Methods 507 & 509)

CM-DI-40 Specifications

  • Input channels: 64 independent floating channels each one fitted with optocoupler.
  • Input overvoltage: Up to 30% nominal for extended periods. 300% for transitory peaks.
  • Galvanic isolation: Full galvanic isolation >1000V on all channels with respect to the VMEbus power & TTL lines.
  • Input voltage ranges: Can be factory fitted for any range from 3 to 300 VAC/DC.
  • Input Change Detector: Programmable input sampling rate from 122Hz to 62.5KHz.
  • Channel protection: 1 W resistor & 1 W zener diode.
  • Input current (ON): 3 to 5 mA per channel.
  • Control Register: Manages BIT and enables IRQs.
  • Front panel LEDs: 64 LEDs. Illuminated when associated channel is driven by nominal voltage (ON).
  • Optocoupler frequency: DC to 10KHz.
  • Power consumption: +5VDC @ 450mA.
  • Board Weight: Military R+ & 883.- 565 grams. Industrial.- 430 grams.
  • Mechanical size: Single slot 6U (233.4x160 mm).
  • VMEbus Interface: A24/D16 Standard slave interface.
  • VMEbus Interrupter: I(1-7). Asserts IRQs to the VME master on channel input changes.
  • VMEbus addressing: Two jumper blocks provide 256 mapping options in the A24 range.
  • Mechanical format:
    • CM-DI-40/A: IEC-297 mechanics for 19 inch racks with I/O on front panel.
    • CM-DI-40/B: Military IEEE P1101 wedgelock mechanics for ATR enclosures.
  • Humidity: Up to 95% RH non-condensing.
  • Altitude: Sea level up to 15 Km (50,000 ft.).

CM-DI-40 Features

  • 64 discrete input channels per board.
  • 3 to 300 VRMS AC/DC input range.
  • Full galvanic isolation >1000 V per channel.
  • Input Change Detector samples and compares all input channels and asserts interrupts on any change. I (1-7) VMEbus Interrupter.
  • Overvoltage input protection per channel.
  • Discrete input signals via 160 pin VME64x connectors on front panel and P2.
  • 64 LED indicators on front panel show all output channels ON-OFF status.
  • Low power CMOS design (3 watts).
  • On board Built-In-Test capability allows testing all module TTL chips.
  • Industrial, MIL-Rugged & MIL-STD-883 versions.
  • Available in IEC-297 mechanics, I/O via front panel & military P1101.2 mechanics with wedge-locks.
  • Conduction cooled PCB with thermal overlay in MIL-Rugged and 883 versions.
  • Extensive software support.
  • Extremely simple programming.
  • Excellent price/performance ratio.
  • Two year guarantee.

CM-DI-40 Ordering

Ordering Example: CM-DI-40 /V /T /M

V (Board Version)
1: 64 Channel optocoupled input board. Voltage range specified by the customer.
2: 64 channel optocoupled input board. Voltage range 0-5 VDC.
3: 64 channel optocoupled input board. Voltage range 0-12 VDC.
4: 64 channel optocoupled input board. Voltage range 0-28 VDC.
5: 64 channel optocoupled input board. Voltage range 0-48 VDC.
6: 64 channel optocoupled input board. Voltage range 0-115 VAC RMS @ 60 Hz sine.
7: 64 channel optocoupled input board. Voltage range 0-220 VAC RMS @ 50 Hz sine.
8: 64 channel optocoupled input board. Voltage range 0-26 VAC RMS @ 400 Hz sine.
9: 64 channel optocoupled input board. Voltage range 0-32 VAC RMS @ 60 Hz sine.

T (Board Temperature Range)
I: Industrial. Fiberglass PCB only.
R+: Military Rugged+. Conduction cooled PCB only.
883: Military 883. Conduction cooled PCB only.

M (PCB Mechanical Version)
A: IEC-297 Mechanics with front panel I/O connectors.
B: P1101.2 Military mechanics, dummy front panel & wedge-locks.

Ordering Example

Part Number Example: CM-DI-40/2/R+/B
- 64 Channel optocoupled input board. Voltage range 0-5 VDC.
- Military Rugged+ range (-40 to +85°C operating).
- IEEE P1101.2 Military mechanics with wedge-locks.


LEVEL 1, CM-DI-40 MAP: User´s manual. Module hardware functional description oriented toward software development.

LEVEL 2, CM-DI-40 MMT: Maintenance manual. Extended description intended for failure location in the module.

Software Support

Wind River Systems VxWorks Tornado: The CM-DI-40 is supported by VxWorks Tornado & is ideal for developing real time software under UNIX environments. A complete "C" language driver in source code is available at low cost. Drivers include a floppy-disk & user's manual.

Microware Systems OS-9: Drivers for the real time OS-9 Operating System are available in "C" language. This driver is supplied with user's manual & source code floppy-disk.

Microtec Research MCC-68K Drivers: A "C" language source code driver written for the MCC-68K cross-compiler from Microtec Research. This low cost option is intended for using a PC as host.

* NOTE - Drivers for other leading operating systems can be optionally supplied under request.