72 line digital I/O | Model 720

Model 720 72 line digital I/O
  • 72 bi-directional TTL lines, programmable in banks of 8
  • 64 lines have edge detection with interrupts
  • 8 lines have input strobe and output enable control
  • Output driver readback


Model 720 is a low-cost solution for interfacing a large number of discrete logic signals to Compact PCI computers. Its 72 I/O lines are software programmable as inputs or outputs in banks of eight lines.

Edge detection

64 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 720 may optionally generate an interrupt whenever state changes occur.

Synchronous I/O

Eight of the 72 I/O channels have special functionality. When programmed as inputs they may be configured to latch input data upon command from an external strobe signal. When programmed as outputs, an external strobe signal can be used to tri-state/enable the outputs. For additional flexibility, the data direction of these special I/O lines is programmable in two 4-bit blocks.

External relays

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


Number of I/O channels72 bi-directional TTL
Update rate5 MHz
Programmable I/O blocksEight 8-bit blocks and two 4-bit blocks
Source current per channel12 mA
Sink current per channel12 mA
I/O connector80 pin
Compatible relay boardModel 720RB
Power supply requirements5 V (at 200 mA)


File Version Type Size
Model 720 Instruction Manual1.0.3PDF289 KB


File Version Type Size
Linux software development kit
For Models 621, 720 and 721
1.0.0TAR110 KB
Windows software development kit
for 32-bit Windows XP
1.0.0ZIP38 KB
Windows software development kit
for Windows 7, Windows 10 64-bit
2.0.0ZIP3.93 MB
Other Operating Systems
Need a software development kit for another operating system? We can port our SDK to
your OS or provide the information you need to do it yourself. Contact Sales for details.

Pricing & Ordering

Model Description Qty 1 Qty 2-9 Order Qty.
72072 line digital I/OCallCall 
Relay Boards
720RBSolid-state relay boardCallCall 
720RBDINSolid-state relay board, DIN rail mountableCallCall 
621C1Cable, 80 conductor, 1 meter$54$49

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