int value of COM11?

Question

I have a RFID Reader that connect to my computer via COM.

1> When the reader connect to my computer via COM3
   C++: OpenComm(3) --> OK

2> When the reader connect to my computer via COM9
   C++: OpenComm(9) --> OK

3> When the reader connect to my computer via COM11
   C++: OpenComm(11) --> Not work

I don't know why it not work.

OpenComm(int com) is a attached library for my RFID Reader. So, I need int value of COM11.

You need to provide much more detail; specifically, you need to show some actual C++ code. — Drew McGowen, Sep 04 '14 at 06:00

score 2 · Answer 1 · answered Sep 04 '14 at 06:02

2

Assuming that you're using Windows - from the CreateFile documentation:

To specify a COM port number greater than 9, use the following syntax: "\.\COM10". This syntax works for all port numbers and hardware that allows COM port numbers to be specified

answered Sep 04 '14 at 06:02

Jonathan Potter

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OpenComm(int com) is a attached library for my RFID Reader. So, I need int value of COM11. – Van Duoc Sep 04 '14 at 06:26
1

Presumably your library doesn't use the required syntax, so no magical int value is going to fix it. – Jonathan Potter Sep 04 '14 at 06:37

int value of COM11?

1 Answers1