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Description
Opens a serial port to begin communications.
Syntax
Status = COMM_Open(sComPort, hComm)
Returns
Zero if no error.
Any value different from zero means an error
Parameters
Name |
Type |
Optional |
Meaning |
sCommPort |
String |
No |
Identifies the serial port number, for example, "COM1", "COM4", etc. |
hComm |
Number |
No |
A number containing a free file number, typically provided by the COMM_FreeFile function. |
Remarks
If the port was not opened successfully, the return value is not zero.
Before actual communications through the port can commence, you must configure the communication parameters by using a COMM_Set statement for each parameter.
Restrictions
When opening ports above "COM9", Windows requires the port name to be specified using the following syntax:
COMM_Open("\\.\COM15", hComm)
See also
Examples
