Measurement-computing USB-DIO24/37 Instrukcja Użytkownika Pobierz pdf (Strona 12)

Chapter 3

Functional Details

Components

The USB-DIO24/37 has the following components, as shown in Figure 5.

 37-pin I/O connector

 USB connector

 LED

Figure 5. USB-DIO24/37 components

37-pin I/O connector

The 37-pin connector provides 24 digital I/O, one counter, six ground, and two 5V power connections.

 The digital I/O is configured as two 8-bit and two 4-bit ports based on the 82C55 specification. Configure

each port independently for input (default) or output.

 The CTR signal is the input to the 32-bit external event counter. The internal counter increments when the

digital input level transitions from low to high, and can count frequencies of up to 1 MHz.

 The six ground (GND) connections are identical and provide a common ground for all device functions.

 The two power connections draw power from the USB connector. The +5 pin is a +5 volt output that is

supplied by the computer.

Caution! The +5 V pin is an output. Do not connect to an external power supply or you may damage the

USB-DIO24/37 and possibly the computer

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Measurement-computing USB-DIO24/37 Instrukcja Użytkownika Strona 12