72 Line Digital I/O

Model 620

Model 620

72 bi-directional TTL lines programmable in banks of 8 lines
64 lines have state-change detection and optional interrupts

8 lines have input strobe and output enable control

Output line status may be read back

Optional 720RB solid state relay board


Adapter board 620 is a low cost solution to interfacing a large number of discrete logic signals to PCI computers. Its seventy- two I/O lines are software programmable as inputs or outputs in banks of eight lines.

 Edge Detection
When enabled sixty-four of the lines can detect logic state changes. A flag is set in a 64-bit register for each input that changes state. The register may be polled to determine which inputs have changed state. The 620 may optionally generate an interrupt whenever state changes occur.

Synchronous I/O
Eight of the 72 I/O channels have special functionality. When pro- grammed as inputs they may be used to latch input data upon command from an external strobe


 signal. If these eight lines are programmed as outputs an external strobe signal can tri-state/enable the data outputs. For additional flexibility, the data direction of these special I/O lines are pro- grammable in two 4-bit blocks.

External Relays
The 620 adapter may be connected to as many as three solid-state relay boards. Each 720RB relay board accepts twenty-four industry standard relays.


Supplied Software (SDK)
The software development kit, SDK, includes the source code of a sample Visual Basic program and a C-language program that allows setting output lines and reading back their status. A 32-bit Windows 95/NT DLL is also supplied.


General Specifications

Number of I/O channels 72 bidirectional TTL
Update rate 8 MHz
Programmable I/O blocks Eight 8-bit blocks and
 two 4-bit blocks
Source current per channel 12 mA
Sink current per channel 12 mA
I/O connector 80 pin
Compatible relay board Model 720RB
Power supply requirements 5 volts at 200 mA
Ordering Information


72-line PCI adapter


1 meter 80-conductor cable


24-channel relay board