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problem in using pci serial port comm3 in vb

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3 replies

by ashwinraut 1 view

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As i require two serial ports for project ,i have installed pci to serial card which gives me comm 3 and 4 port, my comm 1 serial port is working good,I have problem using comm3 serial port in vb,vb gives error of 'variable not defined'
or 'port already open' even if it is connected, all settings of baud rate are correct.

3 replies

by gabriel.antonietti

Probably the problem is that ports share the same IRQ, 1 and 3 share the same IRQ and 2 and 4 alos.
Try using 1 with 2 or 4, or 3 with 2 or 4.
2 and 4 will also not work

by ashwinraut

the comm port worked when i used port1 and 4.thanks.

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