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Model 621 |  72 Line Digital I/O
Features
  • 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 621 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 621 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 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 programmable in two 4-bit blocks.

External Relays
The 621 adapter may be connected to as many as three solid-state relay boards. Each 720RB relay board accepts twenty-four industry standard relays.

Software and Manuals

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 NT/2000 DLL is also supplied.

621 Instruction Manual Released 12/9/02
Model 621 SDK Released 8/19/04 
Model 621 Linux Driver Released 6/12/01

Specifications

Number of I/O channels 72 bidirectional 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 volts at 200 mA
Mating Connector Robinson Nugent P50E-080P-1-SR1-TG

Images and Mechanical Drawings

Model 621 Typical application

Prices


Model 621 Analog and Digital I/O Qty. 1 $449 Qty. 2-9 $408
Model 720RB Solid State Relay Board Qty. 1 $145 Qty. 2-9 $130
Model 720RBDIN Solid State Relay Board Qty. 1 $180 Qty. 2-9 $165
Model 621C1   1 meter 80-conductor cable Qty. 1 $50 Qty. 2-9 $50
Model 7501C 18” flat cable for use with 720RB Qty. 1 $17 Qty. 2-9 $15
Model 7501C1 1 meter flat cable for use with 720RB Qty. 1 $30 Qty. 2-9 $27