Casio CFX-9970G Appendix - Manual (Page 15)

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Data Communications
Functions:
Program contents and file names; function memory data; matrix memory data; list
data; variable data; Table & Graph data; graph functions; equation calculation
coefficients
Method: Start-stop (asynchronous), half-duplex
Transmission speed (BPS): 9600 bits/second
Parity: none
Bit length: 8 bits
Stop bit:
Send: 3 bits
Receive: 2 bits
X ON/X OFF Control: None
Specifications
Appendix E