This is the standard on-site connection method. It requires a direct link between a PC and the alarm panel using a serial port. For CS275, CS575, and CS875 panels, the CS590 cable connects the PC's RS232 port to the panel's J18 PCB connector. For the CS175 panel, which lacks an onboard RS232 port, a CS586 interface module must be used. This module connects to the panel's data bus and provides a standard DB-9 serial connector for the computer.

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