Casio Naurtech CETerm Ver.5.5 Scripting Guide Instrukcja Użytkownika Pobierz pdf (Strona 115)

NAURTECH WEB BROWSER AND TERMINAL EMULATION FOR WINDOWS CE AND WINDOWS MOBILE

CETerm Scripting Guide Page 115

var sp = Device.SerialPort( portIndex );

// Port configuration

sp.EventMask = EV_RXCHAR | EV_DSR;

sp.XOFFOutputFlowControl = false;

sp.XOFFInputFlowControl = false;

// See Appendix 4 for contants

sp.BaudRate = CBR_9600;

sp.DataBits = 8;

sp.StopBits = ONESTOPBIT;

sp.ParityMode = NOPARITY;

// Set read timeouts

sp.ReadTotalTimeoutConstant = 100;

sp.ReadIntervalTimeout = 50;

sp.ReadTotalTimeoutMultiplier = 10;

// Set write timeouts

sp.WriteTotalTimeoutConstant = 100;

sp.WriteTotalTimeoutMultiplier = 0;

// Open port

return sp.Open( GENERIC_READ | GENERIC_WRITE );

}

5.8.4 Using WaitForEvent to Detect Data and State Changes

Section 4.0 describes why scripts cannot run continuously within CETerm. While

a script is blocking on a SerialPort.Read command waiting for data, CETerm

cannot respond to user input or perform other actions. Because of this, you must

keep read timeouts short to maintain a responsive program. Although you could

“poll” the serial port frequently to read newly arrived data, this is an inefficient

technique. The better technique is to use the SerialPort.WaitForEvent

method to run an event handler when data arrives or other states change.

To use WaitForEvent, you first configure the types of events you want to

detect. These are set as flag values in the EventMask property. For example,

to report events for the arrival of data and a change of the DSR state you would

use

var portIndex = 5;

var sp = Device.SerialPort( portIndex );

sp.EventMask = EV_RXCHAR | EV_DSR; // See Appendix 4

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Casio Naurtech CETerm Ver.5.5 Scripting Guide Instrukcja Użytkownika Strona 115