Strip Chart ► Hardware ► Pro ► Specifications
The following are the specifications for the Connectors to the Pro Hardware. To setup the logic for these terminals see Pro USB Preferences.
Analog Input
Channels AIN0 to AIN13 are non-differential voltage input connectors to a 12 and 16 bit A/D converter. They have a dynamic range of 0 to 5 or -5 to 5 volts depending on the settings. That means that the voltage resolution is 0.002441 volts (2.441 millivolts) for the 12 bit setting and 0.000153 volts (0.153 millivolts) for the 16 bit setting for a 5 volt range. If a gain is set then it is applied before digitization. If the gain is 8 then the dynamic range is 0 to 0.625 volts and the resolution is 0.0191 millivolts at 16 bit unipolar setting. So, for low amplitude signals the gain setting can increase the effective resolution.
Analog Output
Channels DAC0 and DAC1 are output voltage terminals. Their D/A converters are 12 bits and output in the range from 0 to 5 Volts. The values for them are set to the input parameters in the USB Preferences window.
Digital Output
Channels FIO0 to FIO7 are digital output voltage terminals. When a digital channel is set on it has the value of 3.3 volts, when off it has a value of 0 volts.
Power
Terminals marked as VS are power output connectors. They are powered through the computer's USB bus so do not try to draw any more power than that rated for your computer, or powered hub if the USB device is connected to a powered hub. For many computers and powered hubs the maximum power that can be drawn is 450mA. If you need additional power then use a external power supply like from a transformer.
Ground
Terminals marked as GND are grounds on a common ground-bus. The ground is connected to your computer's ground so it may or may not be well isolated. Since it is a common ground there is no isolation between ground terminals, a fact that can lead to cross talk between sensors connected to the grounds.