The first 4 I/O lines on the LabJack T4 are dedicated high voltage analog inputs. Their voltage range is ±10V with 12 bits of resolution. For more details, look in the T4 datasheet.
The 8 I/O lines marked as FIO4-FIO7 and EIO0-EIO3 are flexible I/O lines. This means they can be individually configured as digital input, digital output, or analog input lines. When configured as digital I/O, they can be used as general purpose 3.3V logic lines, can be configured for the timers/counters sub-system, or can be used as SPI, I2C, or other digital communication protocol lines. When configured as analog inputs, they are 0-2.5V analog inputs with up to 12 bits of resolution.
The T4 has 8 dedicated digital I/O lines marked as EIO4-EIO7 and CIO0-CIO3. These lines can be configured as general purpose 3.3V logic lines, as timers/counters, or as SPI, I2C, or other digital communication protocol lines.
The LabJack T4 has 2 analog outputs (DAC0 and DAC1). Each analog output can be set between 0 and 5V with 10 bits of resolution.
The T4 has multiple hardware timers that provide options such as PWM output, pulse/period timing, pulse counting, and quadrature input.
The T4 has multiple hardware counters that can be used for detecting pin toggles.