Memo : RS232C pin layout
We will use RS232C for PIC Writer.
These are RS232C pin layout.
25 pin
1 GND
2 TXD
3 RXD
4 RTS
5 CTS
6 DSR
7 GND
8 DCD
9 N.C.
10 N.C.
11 N.C.
12 N.C.
13 N.C.
14 N.C.
15 N.C.
16 N.C.
17 RXC
18 N.C.
19 N.C.
20 DTR
21 N.C.
22 N.C.
23 N.C.
24 TXC
25 N.C.
9 pin
1 DCD
2 RXD
3 TXD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
We mistook that RS232C was 5 Volts, but true RS232C voltage was 3 Volts.
(R.S.F. toshiki speed news press, Agence France-Presse, 5 Friday September 2014 The Roman)