SAMSUNGDCS-816 Installation Manual7-57.6 PC Programming (Figure 7-5)To program the system via a personal computer (PC), connect a PC equipped with the proprietaryprogram, PCMMC, to one of the serial interface connectors (DB9) on an SIO option card (Figures3-1 and 3-2). Before connecting the PC, ensure that the system power is turned OFF. Anyexternal battery, if installed, should also be removed. Otherwise, the system as well as the PCmay be severely damaged.Use a pin-to-pin RS232C cable. Only pins 2, 3, 4, 5, and 6 are required. When the PC needs to bemore than 5 metres away from the system, shielded computer cable is required. Connect a maleDB9 connector to the SIO card and then connect a connector that meets the requirement of the PCto the other end. The cable must not exceed 100 metres.The signal DCD (1) and RTS (7) are optional, which means the system does not refer to the signalstatus. For specific equipment, DSR (6) may not detect the DTR signal from the external source.In this case, connect the DTR signal wire to the DCD (pin 1) of the DCS-816 serial interface.PIN CONNECTIONS TO PC FIGURE 7-5SIO BOARD (DTE DB9) PC (DTE DB25 or DB9)RXD (2)TXD (3)GND (5)DCD (1)TXD (2)RXD (3)GND (7)RTS (4) THE SYSTEM POWER SHOULD BE REMOVED BEFORE CONNECTING THEDEVICE CONNECT A PC EQUIPPED WITH PCMMC TO ONE OF THE DB9 CONNEC-TORS ON AN SIO OPTION BOARD DCD (1) MAY REPLACE DSR (6) FOR SPECIFIC EQUIPMENTTXD (3)RXD (2)GND (5)RTS (7)DB25 DB9RTS (7)DTR (4)CTS (5)DSR (6)CTS (8)DSR (6)DSR (6) DTR (20) DTR (4)DCD (1)