php - Reading & Writing Serial Port COM3 connected using USB to serial connector


I am using Direct IO for reading and writing data to serial port for sending sms using the modem (SIMADO GDT11 IN). Reference:

Code was working fine in windows10 32 bit but now I have upgraded to 64 bit OS, Now the code is not working. Can anyone let me know what will be the issue and help me to sort it out.




Direct I/O is only usable with 32bit operating systems. Most of the legacy applications (16bit or 32bit) either won't run well under 64bit operating systems.

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