Hello!
I have to send that string:
F5 01 00 02 00 C0 01 37 01 01
to COM1 port (9600, ID: 1, Data bits: 8, data number: 1, timeouc 1.5 sec., no flux control, no parity).
But my question is: there is a C serial library can help me to write that program?
What operating system are you talking about?
Which OS and compiler are you using?
I'd guess Windows, since you mentioned COM1
CreateFileA function (fileapi.h) - Win32 apps | Microsoft Learn
Scroll a long way down to "Communications Resources"
See also
Communications Resources - Win32 apps | Microsoft Learn
and
windows - How to use Win32 API to talk to a com port (RS232) - Stack Overflow
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