Measurement Computing's PC-CARD-D24/CTR3 is a data acquisition and control board for PC compatible computers with PCMCIA/PC-CARD type slots. The primary functional elements consist of a 82C55 chip using TTL logic for 24 bi-directional digital I/O lines, and an 82C54 counter/timer chip that has three, 16-bit down-counters.
Under software control, the counters can be clocked internally from a 10 or 1 MS/s crystal oscillator, clocked externally, or chained to yield a 32- or 48-bit counter. Each counter can be gated (disabled) with an external gate signal.
The 24 digital I/O channels are divided into three ports—A, B, and C. Each port has eight I/O channels. At power-on or reset, the digital lines are set as inputs. The board provides three independently programmable and functioning 16-bit down-counters. You can access the clock input, gate, and output for each counter.
"When we started designing these systems, we needed to locate a robust data acquisition unit that we could trust, have multiple inputs and a simple but effective software interface and a reasonable price." Michael Gray, Precia Molen
"We have used MCC devices for many years on any number of different projects, from pile testing to seismic tests, and we've always been more than satisified with their performance. This was the natural choice for us." Stephen Kemp, Manager, GBG Structural Services
