Data acquisition card, expansion control system for data acquisition card and method thereof

A data acquisition card, comprising a card gate module, a channel address generation module and a signal processing module;

• wherein,
• the card gate module is configured to preset a card address, receive a card beat signal from a user circuit and generate a corresponding card address signal, compare the card address signal with the preset card address to judge whether the data acquisition card is gated;
• the channel address generation module is configured to receive a channel beat signal from the user circuit and generate a corresponding channel address signal, and send the channel address signal to the signal processing module;
• the signal processing module is configured to preset a channel address for a data channel, compare the channel address signal with the preset channel address when the data acquisition card is gated, gate the corresponding data channel according to a comparison result, and send data signals output from the user circuit to the gated data channel, or acquire data signals input from the gated data channel and send the acquired data signals to the user circuit.

An extension control system of data acquisition cards, comprising a user circuit and the data acquisition cards configured in parallel, wherein:

• the user circuit comprises a beat signal control module, and each data acquisition card comprises a card gate module, a channel address generation module and a signal processing module;
• wherein,
• the beat signal control module is configured to send a card beat signal and a channel beat signal to a data acquisition card;
• the card gate module is configured to preset a card address for the data acquisition card, receive the card beat signal from the beat signal control module and generate a corresponding card address signal, compare the card address signal with the preset card address to judge whether the data acquisition card is gated according to a comparison result;
• the channel address generation module is configured to generate a corresponding channel address signal after receiving the channel beat signal from the beat signal control module, and send the channel address signal to the signal processing module;
• the signal processing module is configured to preset a channel address for a data channel in the data acquisition card, compare the channel address signal with the preset channel address when the data acquisition card is gated, gate the corresponding data channel according to the comparison result, and send data signals output from the user circuit to the gated data channel, or acquire data signals input from the gated data channel and send the acquired data signals to the user circuit.