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Chapter 1
Introducing the USB-1408FS-Plus
The USB-1408FS-Plus is an analog input and digital I/O data acquisition device that provides the following
features:
Eight analog input channels that are software configurable for either eight 13-bit single-ended inputs or
four 14-bit differential inputs
Two 12-bit analog output channels
16 digital I/O channels that are independently-selectable as input or output in two 8-bit ports
32-bit event counter input for counting TTL pulses
External digital trigger input
Bidirectional terminal for external clocking or multi-unit synchronization
Screw terminals for field wiring connections
The device is powered by the +5 V USB supply from the computer. No external power is required.
The USB-1408FS-Plus is compatible with both USB 1.1 and USB 2.0 ports. The speed of the device may be
limited when using a USB 1.1 port due to the difference in transfer rates on the USB 1.1 versions of the
protocol (low-speed and full-speed).
Functional block diagram
Device functions are illustrated in the block diagram shown here.
Figure 1. USB-1408FS-Plus functional block diagram
