In the case, you must set the RS-232 of DVR as transparent channel mode as following

A software must be run in the ATM machine, and send the credit card number, transaction code to DVR through RS-232 port.

Please provide detail ATM machine communication protocol for actual projects.

4. Receive the command sent by ATM through serial port

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Planet Technology DVR-1670, DVR-470 user manual Receive the command sent by ATM through serial port