Measurement-computing USB-DIO24H/37 Instrukcja Użytkownika Pobierz pdf (Strona 6)

Chapter 1

Introducing the USB-DIO24H/37

Overview: USB-DIO24H/37 features

This manual explains how to install, configure and use the USB-DIO24H/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-DIO24H/37 is a USB 2.0 low-speed device supported under popular Microsoft

Windows

operating

systems. 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-DIO24H/37 is a high drive, 24-line digital I/O device that includes one 32-bit external event counter.

Power is supplied by the +5 volt USB supply from your computer. No external power is required.

Digital I/O lines are accessed through a 37-pin connector. Each digital port can be configured for either input or

output. Digital channels are pulled up to +5V with 47k resistors.

The control register that sets the direction of the I/O ports is an emulation of the 82C55 in mode 0 (only). The

74FCT244 outputs are high-drive TTL, capable of sourcing 15 mA and sinking 64 mA.

The USB-DIO24H/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-DIO24H/37 block diagram

USB-DIO24H/37 functions are illustrated in the block diagram shown here.

Figure 1. USB-DIO24H/37 functional block diagram

1 2 3 4 5 6 7 8 9 10 11 ... 19 20

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Measurement-computing USB-DIO24H/37 Instrukcja Użytkownika Strona 6