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- Thu Jan 18 15:59:35 MST 2001 removed jcl references for rxtx 1.5 Trent.
-
- The Following was contributed by Vaibhav Andleigh andleigh@mit.edu in hopes
- that it will make getting started easier for people new to commAPI.
-
- Feel free to contribute additional information in the same spirit.
-
- Hi Trent,
-
- I recently installed javax.comm and RxTx on a few systems and had to write
- a very detailed HOWTO on read/writing to your com ports on linux for
- beginners. BTW, RxTx is a great tool! In any case, I've included the
- HOWTO with this email for the reference of other users. Feel free to post
- it.
-
- ------------------------
-
- SerialPortInstructions.txt
-
- To get serial port stuff running:
-
- Serial Connection without Java
-
- First, let's setup the serial connection without java and test it.
- Connect your computer to another computer/device via a null modem serial
- cable. Be sure the other computer/device has software (i.e., minicom)
- to receive the signal. For the purpose of these instructions, I'll
- assume you have a computer at each end, and will use minicom to
- perform the connection testing.
-
- In the case of minicom (on the receiving machine), you'll probably have
- to run it as root (since the serial port is owned by root for security
- purposes). It's not a good idea to change these permissions. If this
- is the first time minicom is being run, you'll have to configure it
- first. To do this, ssh to root (not su, anywhere in these instructions)
- and type 'minicom -s' without the quotes. Arrow to option 3 and change
- the serial configuration device to '/dev/ttyS0' without the quotes.
- Exit minicom. Then go and run minicom by typing 'minicom -m -c on'
- without the quotes. Assuming you're running minicom on both machines,
- run a quick test of the serial connection. Type Alt-Z (or whatever
- key-combo gives you help on special keys) and select "Local Echo"(E).
- Now type text on both minicom screens and see that the text is going
- back and forth.
-
- Java.comm and RxTx installation
-
- First install javax.comm api following Sun's instructions
- Be sure to follow the instructions about placing the comm.jar
- in the correct directories. You can ignore the details of
- the javax.comm.properties files since it'll be replaced by RxTx
- anyways.
-
- Then install rxtx-1.4-4 following instructions given in
- their install page. They have a really useful bit of info
- in the INSTALL file talking about where the comm.jar,
- javax.comm.properties files(and its contents) are supposed to go
- (and what other files (libSerial.so and libParallel.so)should
- have been created and where). Verify this happened properly.
- Assuming you're using jdk-1.2, you can ignore the CLASSPATH
- stuff in their extra directions. If you still have problems, they
- have a really useful COMMON PROBLEMS section further down in the
- INSTALL file.
-
- Running Trial Applications
-
- We'll test two apps: BlackBox and the Simple demos. These are
- included in your .../java/commapi/samples directory. Go to
- .../java/commapi/samples/BlackBox/ and type javac *.java to compile
- all the classes.
-
- Then create a run shell script as follows (substitute your own relative
- java location if necessary):
-
- runBlackBox.sh
- #!/bin/sh
- /usr/local/java/bin/java -classpath
- ./:/usrlocal/java/jre/lib/ext/comm.jar:/usr/local/java/samples/BlackBox/BlackBox.jar
- BlackBox
-
- Run this script as ROOT using ssh, not su!
- [or make sure permissions for the device files allow the user/group to read
- them. See also: lockfiles in INSTALL]
-
- It should put up a screen with a GUI of everything going on for each
- of your serial ports. At the top of the screen, you can set the baud
- rate. Unless you changed the settings on minicom, it should be expecting
- 38400 so select that. Go ahead and type in the first left text window
- and you should see the text appear in the receiving minicom window.
-
- If you choose to run the apps labeled as "Simple", go to the
- .../java/commapi/samples/Simple/ directory and edit the SimpleWrite.java
- and SimpleRead.java files. Convert the /dev/tty/a to /dev/ttyS0 in both
- files. Compile both files using javac *.java . Use a run script very
- similar to that above (deleting the path reference to BlackBox.jar and
- replacing BlackBox with SimpleRead/SimpleWrite as appropriate).
- Set up minicom on the other machine and go ahead and run the script.
- It should all work. I've attached the run scripts I used for both
- programs below:
-
- runSimpleRead.sh
- #!/bin/sh
- /usr/local/java/bin/java -classpath
- ./:/usrlocal/java/jre/lib/ext/comm.jar
- SimpleRead
-
- runSimpleWrite.sh
- #!/bin/sh
- /usr/local/java/bin/java -classpath
- ./:/usrlocal/java/jre/lib/ext/comm.jar
- SimpleWrite
-
-
-
-
-
- **********************************************
- Vaibhav Andleigh
- andleigh@mit.edu
- http://utopia1.mit.edu/vab/
- ------------------------------------------------------
- Ph.D. Student, Dept. Mat. Sci. & Engr
- MIT Room 13-5142 Ph: 617-258-8847
- Cambridge, MA Fax: 530-348-8219
- **********************************************
- "Every man dies, not every man really lives."
- --William Wallace, Braveheart
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