[lug] Serial printer connection questions

Chip Atkinson chip at rmpg.org
Tue Sep 17 09:40:13 MDT 2002

There are two problems actually.
1) Transmission speed with parallel printing. The data appears to overrun
the printer.
2) Data transmission (at all) with serial.  It appears that the CTS and
DTR (I think it was DTR anyway) stay low, which I believe is preventing
the actual transmission of data over the serial line.

I'd almost be happy at a speed that was anything faster than the process
of saving to disk, making a trip to Kinko's and coming back home again.

On a similar note, does anyone have a serial breakout box?  I could
actually confirm my suspicions as well as fake out lines being raised.


On Tue, 17 Sep 2002 rm at fabula.de wrote:

> On Tue, Sep 17, 2002 at 09:19:32AM -0600, Chip Atkinson wrote:
> > Oh, wait, you're right.  Still though, I'll look at the bios settings and
> > see what is available.
> Chip, i haven't followed the whole thread, but if you think that
> tranmission speed is the problem here (and not printer memory) you
> can easily test it by setting the serial transmission rate to
> a lower value (2400 :-)
> Also, you could run a silly little test:
>   # --- file: my_throttle.pl ----
>   #!/usr/bin/perl
>   while(<>) {
>     print;
>     sleep 1;
>   }
> and then:
>   bash $ perl my_throttle.pl < my_huge_job.ps > /dev/ttyS0
> (substitute ttyS0 with your actual serial device)
> It might take a while for your job to finish ;-)
>  Ralf
> happy user of an old AppleStyleWriter (on a serial port)
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