Casio TK-6500 - Keyboard Selection Switch

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The COM2 port pin location is as shown below:
Signal Pin Signal Pin
NC 1 NC 1
RxD 2 RxD 2
TxD 3 TxD 3
DTR 4 DTR 4
GND 5 GND 5
DSR 6 DSR 6
RTS 7 RTS 7
CTS 8 CTS 8
VCC(+5V) 9 NC 9
1 2
3
4
5
6
7
8
9
COM2 port
6-11. Keyboard selection switch
The main PCB has the keyboard selection switch to detect the keyboard type.
For the model TK-6500, set the switch to " F" position for the stroke key type.
Keyboard selection switch
Set to " F" position.