Outgoing connections
use ocds to send output to serial devices
such as printers and plotters.
Use this list of tasks to isolate problems due to syntax errors,
incorrect port addresses, telnet operation, ocd processes, pty device
files, or the system data path.
Check for Syntax Errors |
 |
Because dpp parses the dp
file and tries to execute an ocd process
for each valid entry, problems associated with dpp
usually involve incorrect command line syntax, or references to
illegal or non-existent files on the dpp
command line. This class of problem will usually affect all
ports configured in the dp file. The dpp
error messages are listed in Appendix A of this manual.
Check for Incorrect Addresses |
|
DDFA supports several different port addressing formats (See
Chapter 3). If a ping to the IP address of the DTC or other terminal
server fails, then you may have an IP configuration problem.
Verify the correct IP address of the DTC or other terminal
server by cross-checking the dp file, and
the server configuration.
Verify the TCP port associated with a DTC port to which you
are trying to connect using the formula.
TCP_port = ( 32 * board + port + 1 ) * 256 +23 |
Check Telnet Operation |
|
Verify that you can use telnet to access the port:
telnet <DTC or Server IP Addr> <TCP port> |
If this command fails, then the port is probably in use, is
not set up correctly, or may be broken. If the telnet connection
succeeds, then ocd should also succeed.
Verify ocd |
|
Check to see if the ocd process is running.
Look at the ocd command line to make sure you have the correct
syntax and values for IP address of the DTC or non-DTC server. (Note:
Board and port apply to DTCs only.)
Check the pty |
|
Make sure the pty has a character special device file with
access rights of rw-rw-rw and a major number of 17. The minor numbers
will always be different.
ll /dev/telnet/<devfilename> |
The resulting display should look something like this:
crw-rw-rw- 1 root sys 17 0x000030 Jan 20 10:15 /dev/telnet/dtc1b0p0 |
Check System Level Data Path |
|
Verify that system level processes are working properly.
cat /etc/services > /dev/telnet/<devfilename> |
At the system level, ocd, cat
and all other applications use the same outbound data path. If this
data is sent to the device correctly, it proves that it is possible
to detect the opened device file, open a connection to the DTC or
non-DTC server, and send the data to the desired port. If this fails,
then it indicates the need to troubleshoot ocd.
Refer to the ocdebug man page for details.
