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48-Bit OPTO-22 DIO Board. Phased out and replaced by PIO-D48U(PCI)/PEX-D48 (PCI Express)


48-Bit OPTO-22 DIO Board. Phased out and replaced by PIO-D48U(PCI)/PEX-D48 (PCI Express)

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The DIO-48 has officially been phased out and will no longer be available. It has now been replaced by PIO-D48U and PEX-D48.

The DIO-48 provides 48 TTL digital I/O lines, and one 16- bit counter . The DIO-48 emulates 8255 mode 0 and has an increased output current of 15 mA (source) and 64 mA (sink) , allowing it to control LED, relay, etc. The DIO-48 consists of six 8-bit bi-directional ports and 3 input lines for interrupt enable and counter. The 8-bit ports are named port A(PA),port B(PB) and port C(PC). The port C can be split into two four bit. All ports are configured as inputs as inputs upon power-up or reset. The base address is selectable from 200 to 3FF hex. The interrupt signal can be connected to any of the interrupt levels 2 through 7.

  • Connects directly to DB-24P,DB-24R,DB-24PR,DB-885B ,or any OPTO-22 compatible daughter board
  • 48 digital I/O lines
  • One 16-bit counter
  • IRQ Level : IRQ3 ~ IRQ15
  • Interrupt Trigger by Event / Timer / Port C3 , C7
  • Clock Source can be setting : RTC (32.768 k)/1 M/2 M/4 MHz
  • Emulate two industrial-standard 8255 mode 0
  • Two 50-pin flat cable connector
  • Output status read back


  • Factory automation
  • Product test
  • Test automation
  • Digital I/O control
  • Alarm monitoring
  • 4-channel SSR Output Daughter Board


  • DOS sample program(with source codes)
  • DLL and OCX SDK for Windows 98/NT/2000
  • DLL and OCX SDK for 32-bit Windows XP/2003/Vista/7
  • VB/VC/Delphi/BCB sample programs with source codes are included
  • LabVIEW toolkit for Windows
  • Driver for Linux and DasyLab


Digital Input
Channels 48 (OPTO-22 compatible)
Compatibility 5 V/TTL
Input Voltage Logic 0: 0.8 V max.
Logic 1: 2.0 V min.
Response Speed 1.0 MHz (Typical)
Digital Output
Channels 48 (OPTO-22 compatible)
Compatibility 5 V/TTL
Output Voltage Logic 0: 0.4 V max.
Logic 1: 2.4 V min.
Output Capability Sink: 0.8 mA @ 0.8 V
Source: -2.4 mA @ 2.0 V
Response Speed 1.0 MHz (Typical)
Channels 3 independent
Resolution 16-bit
Input Frequency 10 MHz max.
Clock Source 32.768 kHz/2 MHz/4 MHz
Bus Type ISA
I/O Connector 50-pin box header x 2
Dimensions (L x W x D) 159 mm x 120 mm x 22 mm
Power Consumption 900 mA @ +5 V
Operating Temperature 0 ~ 60 °C
Storage Temperature -20 ~ 70 °C
Humidity 5 ~ 85% RH, non-condensing

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