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SENSORAY Model 720

SENSORAY Model 720
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  • 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 channels 72 bi-directional TTL
Update rate 5 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 V (at 200 mA)