Digital I/O and counter card

November 2002 Sensors & Transducers

Advantech's PCL-720 is a PC compatible add-on digital I/O and counter card. It has 32 digital input channels, 32 digital output channels and three programmable counter/timer channels.

The digital I/O channels are TTL-compatible and use 74LS244 driver/buffer circuits to provide high output driving capacity. These buffered circuits also require lower input loading current than regular TTL circuits. The card's 8254 programmable counter/timer provides three flexible 16-bit counter/timer channels. Waves and pulses can be generated by programming the 8254 and a breadboard area is available for customised circuits.

Typical applications for the PCL-720 include, for example, contact closure monitoring, period and pulse width measurement and event and frequency counting.

For more information contact Elton Prytz, ProMicro, 011 706 7913, [email protected], www.promicro.co.za

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