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Digital I/O

Scientific experiments or industrial processes require the control of relays, valves or other devices with digital inputs and outputs. Discrete voltage or current levels represent digital signals whereas most logic standards use two voltage states which indicate "logic low" (0) and "logic high" (1).

The TTL logic family represent logic low for voltages between 0 V and 0.8 V and logic high for voltages from 2 V up to 5 V. Voltages in between are invalid and the logic state in undefined. The CMOS logic family specify the logic low state from 0 V to 1.3 V and the logic high state from 3.7 V to 5 V.

Industrial applications and harsh environments require high signal-to-noise ratios to reduce error-proneness. Therefore voltage levels of up to 24 V are commonly used. Communication protocols like RS232 even define the voltage range from 3 V to 15 V as logic low and the voltage range from -15 V to -3 V as logic high. The logic state for voltages between -3 V and 3 V is undefined. The RS422 protocol only uses voltages up to 5 V but the signal is distributed via differential lines which reduces the sensitivity to common-mode error caused by EMI or ground bounce.

General Purpose I/Os

In order to meet the requirements of many scientific and industrial applications general purpose digital input and output lines are utilized. The DIO01 device is a versatile and easy-to-use octuple, bidirectional digital I/O module. Every of the eight channels can individually be configured for input or output and is compatible with 5 V TTL / CMOS and 3.3 V LVTTL / LVCMOS voltage levels. Custom timers, counters, pulse generators or digital communication protocols like the widespread SPI bus system can easily be implemented.

Rotary Encoders

The rotary encoder is an electro-mechanical device that converts the angular position or rotation of an axle to an analog or digital signal. In particular Gray code encoders use binary counting to provide an absolute digital value and can be connected to general purpose I/O modules.

Digital Actuators

In a variety of applications electro-mechanical relays, electrical or electro-pneumatic valves, long transmission lines or other digital transducers have to be controlled. Voltages up to 24 V or more are required. The DO01 Octal Digital Output Buffer can directly interface these devices and can even drive DC motors.
If high-power electrical or electro-pneumatic valves, heaters or AC / DC motors and other high-power devices shall be controlled, the DO02 Octal SPST Relay Module can be utilized. The device features eight independently controllable channels with up to 250 VAC / 3 A each. The fast switching times of less than 2 ms enable fast and reliable control.