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Common Questions & Answers
C. Check the level conversion. When using a driver/receiver chip, such as the MAX 232,
do not use INVERT when making direct connections with resistors and/or diodes. You
probably need the INVERT option in the #USE RS232.
D. Remember that PUTC(6) will send an ASCII 6 to the PC and this may not be a visible
character. PUTC('A') will output a visible character A.
2. The PIC? is Receiving Garbage Characters.
A. Check all of the above.
3. Nothing is Being Sent.
A. Make sure that the tri-state registers are correct. The mode (standard, fast, fixed) used
will be whatever the mode is when the #USE RS232 is encountered. Staying with the
default STANDARD mode is safest.
B. Use the following main() for testing:
main() {
while(TRUE)
putc('U');
}
Check the XMIT pin for activity with a logic probe, scope or whatever you can. If you can
look at it with a scope, check the bit time (it should be 1/BAUD). Check again after the
level converter.
4. Nothing is being received.
First be sure the PIC? can send data. Use the following main() for testing:
main() {
printf("start");
while(TRUE)
putc( getc()+1 );
}
When connected to a PC typing A should show B echoed back.
If nothing is seen coming back (except the initial "Start"), check the RCV pin on the PIC?
with a logic probe. You should see a HIGH state and when a key is pressed at the PC, a
pulse to low. Trace back to find out where it is lost.
5. The PIC? is always receiving data via RS-232 even when none is being sent.
A. Check that the INVERT option in the USE RS232 is right for your level converter. If
the RCV pin is HIGH when no data is being sent, you should NOT use INVERT. If the pin
is low when no data is being sent, you need to use INVERT.
B. Check that the pin is stable at HIGH or LOW in accordance with A above when no
data is being sent.
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