Rs232C Port Com1 Circuit - Casio CE-6800 Service Manual

4-8. RS232C port COM1 circuit

The COM1 circuit is as follows:
The COM1 port pin location is as shown below:
Signal
CD
RxD
TxD
DTR
GND
DSR
RTS
CTS
CI
Pin
1
2
3
1 2 3
4
5
6 7
6
7
8
9
— 14 —
4 5
8 9