3692
правки
Строка 218: | Строка 218: | ||
Such outputs are called “open collectors”. | Such outputs are called “open collectors”. | ||
Input stage of Ax channel consists of an analogue-to-digital converter ADCx and an input resistor Rx. | Input stage of Ax channel consists of an analogue-to-digital converter ADCx and an input resistor Rx. | ||
The ADC has a high impedance, so it doesn't affect the channel operation even if the channel works as output. | |||
In input mode the Tx switch is inactive (open) and, thus, does not affect voltage measuring at the channel terminals. Input resistance of the channel in input mode is determined by the Rx resistance. | |||
If the channel terminal is left floating, the input voltage measured by ADCs is pulled down to zero by the Rx resistance. | |||
А4 and А5 support binary input function DI: more than 3V at the terminal is considered as triggering of the input. | А4 and А5 support binary input function DI: more than 3V at the terminal is considered as triggering of the input. |