Prosoft-technology MVI56E-LDM Manual do Utilizador descarregar pdf (Página 55)

ControlLogix Platform ♦ "C" Programmable Understanding the MVI56-LDM API

Linux Application Development Module Developer's Manual

ProSoft Technology, Inc. Page 49 of 264

March 12, 2014

4.12 Serial Sample

To run the Serial sample:

1 Open a command window using telnet or a similar terminal software on the

PC through a serial (P1) or Ethernet port.

2 Login as user: root, password: password.

The second serial port (P2) will be used for the communication sample.

To execute the sample:

1 From the default home directory /psft, type the command ./Serial_Sample&.

The program runs as a background task.

While looking at the sample source, you'll see that the following occurs:

 register sigquit_handler for four signals

 check command line and print usage message if required

 open the backplane using open_backplane()

 Read the serial configuration jumpers and make sure that the second serial

port is configured for RS232.

 Open the serial port using the open_serial_port() function.

 Opens the serial device by calling open()

 Reads current serial port attributes using tcgetaddr()

 Configures serial port attributes. cfsetispeed() and cfsetispeed() set the

baud rate. tcsetattr() is then used to set the remaining attributes.

 Initialize LEDs on the front panel

 Changes the front panel display to "Run"

 Enters a for loop which transmits a test string one character at a time by

calling write() and then sleeping for 500 msec using OCXcip_Sleep()

 Closes the serial driver connection using close().

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Prosoft-technology MVI56E-LDM Manual do Utilizador Página 55