Users manual

E-2
SCADA 3000 User’s Manual
Pin Description and Data Direction
The pin descriptions and signal direction for each COM port follow:
Figure 3: Com Ports
COM 1 (DCE)
Pin Description Direction
1 DCD Data Carrier Detect Output
2 RD Receive Data Output
3 TD Transmit Data Input
4 DTR Data Terminal Ready Input
5 SG Signal Ground
6 DSR Data Set Ready Output
7 RTS Request to Send Input
8 CTS Clear to Send Output
9 N.C. No Connection
COM 2 (DTE)
Pin Description Direction
1 DCD Data Carrier Detect Input
2 RD Receive Data Input
3 TD Transmit Data Output
4 DTR Data Terminal Ready Output
5 SG Signal Ground N/A
6 DSR Data Set Ready Input
7 RTS Request to Send Output
8 CTS Clear to Send Input
9 N.C. No Connection