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Help / WLanguage / WLanguage functions / Standard functions / Windows functions / Serial/Parallel Ports functions
  • Closing the port after a read or write operation
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Stored procedures
Closes the specified serial port, parallel port or infrared port.
Remarks:
  • A port must be closed as soon as it is no longer used.
  • Linux Only serial ports are supported.
  • WEBDEV - Server code This function affects the server.
Example
NumPort is int
NumPort = sOpen("COM1", 2000, 2000) // Ouverture de COM1
IF NumPort <> 0 THEN
	// Paramétrage de COM1 : Taux 9600, parité paire, 
	// 8 bits de données, 1 bit de stop
	sParameter(NumPort, 9600, 1, 8, 0)
	// Suite traitement...
	sClose(NumPort) // Fermeture de COM1
ELSE
	Error("Erreur d'ouverture de COM1")
END
Syntax
sClose(<Port number>)
<Port number>: Integer
Identifier of the port used:
  • Port number:
    • Serial port number: 1, 2, 3, ... 32 for COM1, COM2, COM3, ... COM32.
    • Parallel port number: -1, -2, -3 or -4 for LPT1, LPT2, LPT3 or LPT4.
    • Infrared port number: 1, 2, 3, ... 32 for IR1, IR2, IR3, ... IR32.
  • Port identifier returned by sOpen (if this function was called with a port name).
    Linux Only this type of parameter is available.
Remarks

Closing the port after a read or write operation

If sClose is run just after sWrite or sRead, some characters may not be written or read. Indeed, sClose can close the port before all the characters are written or read. To avoid this behavior, use Multitask.
Res = sOpen("COM2", 2000, 2000)
IF Res <> 0 THEN
	sParameter(Res, 9600, 0, 8, 0)
	sWrite(Res, Ch)
	Multitask()
	sClose(Res)
END
Business / UI classification: Business Logic
Component: wd300com.dll
Minimum version required
  • Version 9
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Last update: 03/27/2025

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