PC Comm port
The converter used in this example is manufactured by: B&B Electronics. Their website is www.bb-elec.com.
The reference number for this converter is 232CL9R
2 R+
9 12v
7 R-
4 T+
6 T-
8 0v
R+
T+
R-
T-
12v
Gnd
External power supply