RE: Serial Printer Under RedHat 7.3

[Adam Ellis <AdamE AccelGrp com>]

Gary,

Thanks for your response (also thanks to Keith for tips from yesterday).
I've tried your suggestions and it ended up being two problems.  The cable
was incorrect (no flow control pins) and the first serial port on my
computer was bad.  After switching to another cable and moving to the second
serial port everything worked like a charm.  Now to share this puppy through
CUPS/SMB...

Thanks again for your help,
Adam

-----Original Message-----
From: Gary Stainburn [mailto:gary stainburn ringways co uk]
Sent: Wednesday, June 19, 2002 8:54 AM
To: redhat-list redhat com; Adam Ellis; 'redhat-list redhat com'
Subject: Re: Serial Printer Under RedHat 7.3


On Tuesday 18 June 2002 2:49 pm, Adam Ellis wrote:
Hi,

> I am trying to set up a serial printer (Okidata Microline 182 Plus) under
> RedHat 7.3 and am not having much luck...maybe somebody out there has a
few
> tips for me.  The printer is plugged into the first DB9 serial port on my
> computer (labeled 1).  The serial ports are found at boot:
>
> <snip>
> Serial driver version 5.05c (2001-07-08) with MANY_PORTS MULTIPORT
> SHARE_IRQ SERIAL_PCI ISAPNP enabled
> ttyS00 at 0x03f8 (irq = 4) is a 16550A
> ttyS01 at 0x02f8 (irq = 3) is a 16550A
> </snip>

This looks fine.

>
> ...and I am seeing this in /proc/tty/driver/serial:
>
> <snip>
> serinfo:1.0 driver:5.05c revision:2001-07-08
> 0: uart:16550A port:3F8 irq:4 baud:1200 tx:11 rx:0 RTS|DTR|DSR|RI
> 1: uart:16550A port:2F8 irq:3 baud:9600 tx:18 rx:0
> </snip>

This also looks fine.  However, it may be worth your while to actually set 
the port manually using setserial.

You could try connecting another computer to the port and see what happens 
then - it would eliminate the printer as the problem and probably give you a

better idea as to what's going on.

Finally, check the cable is configured correctly and is not faulty.  If the 
flow-control  - e.g. RTS/CTS or DTR/DSR pins are not connected that would 
cause your hanging problem.  Try turning off flow-control and see what 
happens then.

Gary

>
> However, the following command just hangs when I type it at the console:
> # echo "hello" > /dev/ttyS0
>
> And typing this just returns me to the command prompt with no result:
> # echo "hello" > /dev/ttyS00
>
> Does anybody have any idea what my problem is here?  Do I need to do
> something with the setserial command?  Thanks in advance for your help.
>
> AE
>
>
>
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-- 
Gary Stainburn
 
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