OpenPort - method of the PmaComm object
Description:
Open the serial/ethernet port of this object.
Syntax:
Boolean OpenPort(String sParam)
Parameters:
| sParam | (String) Parameters for opening
- for serial link: Only the port name is entered here.
For example "COM1".
- for Ethernet-client: The IP address and/or port number is entered.
Entries are in the KeyVal format, for example "ipaddress:192.168.0.126;port:61682;". If any of the entries remain empty, then the previously entered value remains valid. |
|---|
Return values:
true -
- for serial link: Port has been successfully opened.
- for Ethernet-client: The parameters has been set and connection will be opened during the next transfer.
false -
- for serial link: Port hasn't been opened. Possible error: Such port is not present on this computer or it is already used.
- for Ethernet-client: Because this method doesn't create a connection, false is return only if for bad parameters of the method.
Note:
This method cannot be used for the
PmaComm object that contains
PmaCommMsg object of the
Slave type.
for serial link: The default setting of the serial communication port is defined in the "
Serial port" configurator in parameters of the serial link. If it is necessary to change dynamically the serial link port, then it is possible to enter
Not set in its parameters and than by methods
OpenPort and
ClosePort change the port.
For serial link each
PmaComm object must have
defined another communication port. For example, if one
PmaComm object communicates through
COM1, then next
PmaComm object can communicate for example through
COM2 (
COM3, ...) but it mustn't communicate through
COM1.
for Ethernet-client: The method only adds new connection parameters into the object. The following transmission will close existing connection and open new connection.
Example1:
for serial link: Algorithm called after the request for sending 1 message (by the
PmaCommMsg object) through
COM1 port.
JavaScriptVBScriptSelect and copy to clipboard
if (oComm.OpenPort("COM1"))
{
oCommMsg.Run();
}
If oComm.OpenPort("COM1") Then
oCommMsg.Run
End IfExample2:
for Ethernet-client: Sets the IP address and port. The next calling of the
Run method will close previous connection and open new connection.
JavaScriptVBScriptSelect and copy to clipboard
oComm.OpenPort("ipaddress:192.168.0.2;port:88;");
oCommMsg.Run();
oComm.OpenPort "ipaddress:192.168.0.2;port:88;"
oCommMsg.Run
History:
Pm9.00.25:
Fixed bug: Repeated calling of this method, at the moment when the previous connection has not yet ended, caused the communication to stop.