Measurement-computing USB-1208LS User Manual download pdf (Page 6)

Chapter 1

Introducing the USB-1208LS

The USB-1208LS is a USB 1.1 low-speed device supported under popular Microsoft

Windows

operating

systems. It is designed for USB 1.1 ports, and tested for compatibility with both USB 1.1 and USB 2.0 ports.

The USB-1208LS features eight analog inputs, two 10-bit analog outputs, 16 digital I/O connections, and one

32-bit external event counter.

The analog inputs are software configurable for either eight 11-bit single-ended inputs, or four 12-bit

differential inputs. An on-board industry standard 82C55 programmable peripheral interface chip provides the

16 digital I/O lines in two 8-bit ports. You can configure each port independently for either input or output.

The USB-1208LS is powered by the +5 volt USB supply from your computer; no external power is required.

I/O connections are made to the device screw terminals.

Functional block diagram

USB-1208LS functions are illustrated in the block diagram shown here.

Figure 1. Functional block diagram

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Measurement-computing USB-1208LS User Manual Page 6