Measurement Computing USB-1208LS - Manual (Page 6)

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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