Measurement Computing USB-3110 - Manual (Page 7)

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Chapter 1
Introducing the USB-3110
Overview: USB-3110 features
This user's guide contains all of the information you need to connect the USB-3110 to your computer and to the
signals you want to measure. The USB-3110 is part of the Measurement Computing brand of USB-based data
acquisition products.
The USB-3110 is a USB 2.0 full-speed, high-drive device that is supported under popular Microsoft ®
Windows
®
operating systems. The USB-3110 is fully compatible with both USB 1.1 and USB 2.0 ports.
The USB-3110 provides four channels of analog voltage output, eight digital I/O connections, and one 32-bit
event counter.
Each of the voltage outputs of the USB-3110 incorporates high-drive current output capability. The high drive
current outputs allow each of the voltage outputs to sink/source up to 40 mA (maximum) of load current.
Caution! The USB-3110 voltage outputs should not be kept in a short-circuit condition for longer than the
specified 100 ms. For those applications that may potentially exceed the 40 mA maximum current
limit or the 100 ms short-circuit condition, external current limiting must be used to prevent
potential damage to the USB-3110.
The USB-3110 has a quad (4-channel) 16-bit digital-to-analog converter (DAC). You set the voltage output
range of each DAC channel independently with software for either bipolar (±10 V) or unipolar (0 to 10 V). The
analog outputs may be updated individually or simultaneously.
The USB-3110 features eight bidirectional digital I/O connections. You can configure the DIO lines as input or
output in one 8-bit port. All digital pins are floating by default. A screw terminal connection is provided for
pull-up (+5 V) or pull-down (0 volts) configuration.
The 32-bit counter can count TTL pulses. A bidirectional synchronization connection allows you to
simultaneously update the DAC outputs on multiple devices.
The USB-3110 is powered by a 5 volt, 2 amp AC power adapter that is shipped with the board. All I/O
connections are made to the screw terminals located along each side of the USB-3110.
Figure 1. USB-3110