Digital I/O Card

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.

• 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

• 104-DIO-48E - 48 Parallel Bits of Digital I/O
• 104-DIO-24E - 24 Parallel Bits of Digital I/O