Simple Communications Program example

[Terry Zivney]

I can't get the following to work.
It is on page 211 of the Power Basic User's Guide.
PB 3.5 for DOS. Doesn't work on either of two
different DOS computers. The Terminal.BAS on
the \example directory on the distribution disk
works ok on both computers! The
error message I get is error 24 - Device timeout.
The error is on the OPEN "COM1: ... " line

DEFINT a-z
$COM 1024
OPEN "COM1: 9600,N,8,1" AS #1 LEN = 1024
echo = 1
WHILE (1)
WHILE NOT INSTAT
IF LOC(1)>0 THEN
stuf$ = INPUT$(LOC(1),#1)
PRINT stuf$;
END IF
WEND
WHILE INSTAT
myinput$ = INKEY$
PRINT #1,myinput$;
IF echo THEN PRINT myinput$;
WEND
WEND


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[Mel Bishop]

If your modem is external and the cable isn't setup for hardware
flow control, you will have switch over to software flow control,
i.e., Xon/Xoff

Also, in your example, you have a space in "COM1: 9600..."
that may have something to do with it or not.

OPEN "COM1:9600,N,8,1,rs,cs,ds,cd" AS #1 LEN = 1024

Another thought: COM1 is usually built into the system. If you
have an internal modem, check to see that it is set to COM2 thru
COM4.



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[Terry Zivney]

I'm just using the software to talk
with another device - no modem involved.

I'll check out the space to see whether that
makes any difference.

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[Lance Edmonds]

The key difference between your code and the TERMINAL.BAS example is that the latter uses the ",DS,CS,CD" options... quite likely the the CD option is all you need to use to disable carrier detect. By default, CD will be set for a 1000mSec timeout.

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Lance
PowerBASIC Support
mailto:[email protected][email protected]</A>

[Terry Zivney]

Yes, Lance, that's it! Using the ,DS,RS, etc
fixed the sending ok. But, I still receive nothing
using the modified sample program, altho the
terminal.bas example receives data ok.

Fortunately, for this application, I only need
to send!

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