104-DIO-48E/24E Digital I/O Cards

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  • 48 Parallel Bits of Digital I/O Type 82C55 PPI mode 0
  • Compatible with Opto-22 type Solid State Module Racks
  • Two 24 bit groups (two 8 bit ports, two 4 bit ports each group)
  • All bits are buffered, 64mA sink, 32m A source
  • I/O pulled up to 5V for Contact Monitoring, Pulldown resistors are an option (factory installation)
  • Fused (resetable) 5V available on pin 49 of each group
  • I/O connectors: Two Industry Standard 50 pin headers plus one ten-pin header for counter timer

Factory Options: (call for pricing and availability)

  • 82C54 with three 16-bit counter/timers for event counting, frequency output, pulse width and frequency measurement
  • 0 to 70°C and -40 to +85°C versions available
  • Pull-down resistors on I/O lines
  • RoHS Available. Please contact us for ordering information
Last updated on February 21, 2024, 9:22 am


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Digital I/O Cards
The circuits use an 82C55A PPI with mode 0 supported. Ports A, B and C are buffered with 74ABT245 transceivers and pulled up to 5V.

The optional 82C54 has three-sixteen bit down-counters within one chip. These counters are useful for making frequency outputs, measuring frequency of square waves, pulse width outputs, pulse width measurements etc. Software drivers are provided on CD.




Software Support

  • DOS, Linux, Windows 95/98/Me/NT4/2000/XP/2003 Sample Programs and Drivers
  • Event Counter, Frequency Output, Frequency and Pulse Measurement


  • Power Required: +5V @50mA Typical
  • Operating Temperature: 0°C to +70°C, optionally -40°C to +85°C available
  • Storage Temperature: -40 to +150°C
  • Interrupt Requests: Eleven channels, IRQ 3-7, 9-12, 14, 15

CE testing & approval must be done at the system level, in the designed enclosure, and is not done on individual boards.

ModelDescriptionPrice (USD)

24-bit, Digital Input/Output, PC/104 Board


48-bit, Digital Input/Output, PC/104 Board

Cable Connectivity
CAB50F-6 Cable, Ribbon, 50-pin Female to Female, 6 feet
C104-50F-12 Cable, Ribbon, 50-pin Female to Female, 1 foot
STB-50 DIN-rail mountable screw terminal board for 50 pin header type connector
STB-48CH External screw terminal board for 26 to 12 AWG wire and remote wiring
Relays and Signal Conditioning
CAB50F-6 Cable, Ribbon, 50-pin Female to Female, 6 feet
IIB-24 24-channel optical isolator board for each 50-pin header