Q-See QSF2648016 - Manual (Page 95)

User Manual for Commercial Series Net DVR
Page
95 Total 121
In the case, you must set the RS-232 of DVR as transparent channel mode as follows:
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