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Appendix 3 Single chip microcomputer
interface instance
Each pin signal is defined as shown
Signal
name
IDC10
socket pin
No.
5PIN
socket pin
No.
Source
Explain
RXD
3
3
computer Printer
receive
data
from
computer
TXD
2
2
printer
Printer
send
control
code
XON/XOFF
and
data
to