Digital I/O and Counter Card

Its digital I/O channels are TTL-compatible and use 74LS244 driver/buffer circuits to provide higher driving capacity for outputs. These buffered circuits also require lower loading current for input than the regular TTL circuits.

The PCL-720's Intel 8253 programmable timer/counter provides three flexible 16-bit timer/counter channels. You can generate waves and pulses by programming the 8253. Jumper settings determine clock crystal frequency. The PCL-720 also includes a breadboard area perfect for customized circuits.

Applications

• Digital input
  Contact-closure monitor
  Switch-panel status sensor BCD interface receiver
  Digital signal interface
  
• Digital output
  Industrial ON/OFF controller
  Digital signal interface
  BCD interface driver
  
• Counter/timer
  Period and pulse-width measurement
  Event and frequency counting
  Waveform and pulse generation

Features

• 32 TTL digital input channels 3
• 2 TTL digital output channels
• High output driving capacity
• Low input loading
• Three programmable counter/timer channels
• User configurable clock source
• Breadboard area for custom circuits

Specifications

Digital input

• Logic level 0: 0.8 V max
• Logic level 1: 2.0 V min.

Digital output

• Logic level 0: 0.5 V max. @ 24 mA (sink)
• Logic level 1: 2.0 V min. @ 15 mA (source)

Programmable counter/timer

• Frequency range: 0 to 2.6 MHz
• Counters: Three independent 16-bit counters
• Modes: Six programmable modes
• Usable pins: CLOCK and GATE for each channel

Clock Source

• Clock frequency: 2 MHz, 1 MHz, 500 KHz or 250 KHz; jumper selectable
• Frequency divider: divided by 1, 10, 100 or user adjustable

General

• Transfer rate: 300 Kbps typical, 500 Kbps max.
• Power consumption: +5 V @ 500 mA typical
• Dimensions: 8" x 3/4" (205mm x 95 mm)
• I/O port address: Eight consecutive bytes from hex 200 to hex 3F8
• Breadboard area: 651 (31 x 21) plated-through "donuts", each with a .036" hole on .10" centers

Ordering Information

PCL-720

Digital I/O and Counter Card, user's manual

PCLD-780 

Screw Terminal Board

PCLD-782B 

24/16 Channel Opto-isolated D/I Board

PCLD-785B 

24/16 Channel Relay Output Board

 

PCLD-786 

SSR and Relay Driver Board

PCLK-1050 

Industrial Wiring Kit

PCLS-DLL-DIO $FREE

Window 3.1 DLL Driver