5VDC (TTL) cards are very common among automation devices.īuffered outputs. Interface directly with parallel port interface products and other CNC4PC cards. Microcontroller based SCHP. This board comes with a microcontroller that allows the implementation of a complex algorithm for sampling and analyzing the SCHP signal.Īll TTL 5VDC signals. This board includes low pass filters to reduce the effect of the noise from the drivers or other devices over the signals. Support for up to 150 KHz optoisolation on step and direction signals. New on this revision is that the optoisolation circuit has been optimized and now supports full optoisolation at speeds over 150 kHz.īuilt-in Passive Low Pass Filters for the all signal. This board keeps the grounds of the PC isolated from the grounds of the rest of your CNC circuit. Extra precautions have been taken when designing this circuit, by taking into consideration the extremely high voltages that stepper drivers can achieve and lack of experience that some users could have in wiring circuits of this kind. One power connection is power powering the circuit that interacts with the PC the other connection is for powering the circuit that interacts with your CNC system. That is the reason why this card has two power connections. In this way, a power surge has no way of reaching your computer. The signals are transmitted through light and not through physical connections.
When the signal is on, the LED lights up, the phototransistor captures it and relays the signal. An opto-isolator is an integrated circuit that transmits the signal through an encapsulated LED and phototransistor. Includes jumpers to select the best input configuration for your application.įully optosiolated. The card isolates connections to protect your computer from short-circuit. PULL-UP or PULL-DOWN selection for inputs. Includes the circuitry recommended by the IEEE 1284 Level 1 standards for bidirectional parallel communications between personal computers and peripherals
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