ProSoft Technology MVI56E-LDM - Manual (Page 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()
.