3Com TECHD-0000000122 Home Security System User Manual


 
Port Connectors
X-Series Hardware Installation and Safety Guide V 2.5 33
4 Data Terminal Ready (DTR)
5Ground (GND)
6Data Set Ready (DSR)
7Request to Send (RTS)
8 Clear to Send (CTS)
9Ring Indicator (RI)
Table A - 3: DB-9 Connector Pinouts
Pin Number Signal Name