ChkCom Function

Returns number of characters in the reception buffer of a communication port.

Syntax
ChkCom ( portNumber As Integer )

Parameters

portNumber

Specify an integer value for the RS-232C port number.

• Real Part: 1 to 8
• Windows Part: 1001 to 1008

Return Values
Number of characters received (integer).

If the port cannot receive characters, the following negative values are returned to report the current port status:

• -2: Port is used by another task
• -3: Port is not open

See Also
CloseCom, OpenCom, Read, Write

ChkCom Function Example

Integer numChars

numChars = ChkCom(1)