Chapter 1
Introducing the USB-DIO24/37
Overview: USB-DIO24/37 features
This manual explains how to install, configure and use the USB-DIO24/37 digital I/O board. You can use
this board in a variety of digital applications to control logic devices such as switches, gauges, relays,
pumps, and sensors.
The USB-DIO24/37 is a USB 2.0 low-speed module supported under Microsoft® Windows® 98 (2
nd
edition), Windows ME, Windows 2000, and Window XP. It is designed for USB 1.1 ports, and was tested
for full compatibility with both USB 1.1 and USB 2.0 ports.
The USB-DIO24/37 features 24 bits of digital I/O and one 32-bit external event counter. The device is
powered by the +5 volt USB supply. No external power is required. All I/O connections are made to a 37-
pin connector. Digital channels are pulled up to +5V with 47k resistors.
An on-board industry standard 82C55 programmable peripheral interface chip provides the 24 discrete
digital I/O lines in four ports. You can configure each digital port independently for either input or output.
The USB-DIO24/37 board is completely plug-and-play, with no jumpers or switches to set. All board
addresses are set by your system's plug-and-play software
USB-DIO24/37 block diagram
USB-DIO24/37 functions are illustrated in the block diagram shown here.
PORT A
C
ont
ro
l
PORT A (7:0)
PORT B (7:0)
PORT CH (3:0)
PORT B
PORT CH
PORT CL
PORT CL (3:0)
USB
Microcontroller
500 mA
USB 2.0
compliant
interface
8
37-
P
in I
/O
C
onn
ect
or
32-bit
Event Counter
1 channel
1
82C55 DIO
Figure 1-1. USB-DIO24/37 functional block diagram
1-1
Содержание USB-DIO24/37
Страница 1: ...i ...
