Re: Serial Connection -- shielding

2011-04-01 Thread MAROUNI Abbass
Le 01/04/11 01:51, Stephen Powell a écrit : On Thu, 31 Mar 2011 09:14:07 -0400 (EDT), MAROUNI Abbass wrote: In a production environment, this what will happen : Two servers connected with a single serial cable ( Which I need to figure out how?! :) ), ttyS0 on server1 to ttyS0 on server2. getty

Re: Serial Connection -- shielding

2011-03-31 Thread Stephen Powell
On Thu, 31 Mar 2011 09:14:07 -0400 (EDT), MAROUNI Abbass wrote: > In a production environment, this what will happen : > > Two servers connected with a single serial cable ( Which I need to > figure out how?! :) ), ttyS0 on server1 to ttyS0 on server2. > getty is always listening to the ttyS0 por

Serial connection; was Re: Serial Connection -- shielding

2011-03-31 Thread peasthope
Abbass, From: MAROUNI Abbass Date: Thu, 31 Mar 2011 15:14:07 +0200 > I am still not convinced that the serial cable might have different ends > if it's a standard null modem cable, ... You haven't ruled out a broken conductor where you can't see it. And there are other cables with the app

Re: Serial Connection -- shielding

2011-03-31 Thread Stan Hoeppner
Stephen Powell put forth on 3/31/2011 6:30 AM: > You can't > reverse the direction of communications without physical access to > *both* servers. That is why you need two serial ports on each server > and two properly-wired cross-over cables. If you only care about > one-way control, then why d

Re: Serial Connection -- shielding

2011-03-31 Thread Moczik Gabor
MAROUNI Abbass wrote: In a production environment, this what will happen : Two servers connected with a single serial cable ( Which I need to figure out how?! :) ), ttyS0 on server1 to ttyS0 on server2. getty is always listening to the ttyS0 port on both servers (assured by inittab respawn).

Re: Serial Connection -- shielding

2011-03-31 Thread MAROUNI Abbass
Le 31/03/11 13:30, Stephen Powell a écrit : On Wed, 30 Mar 2011 06:30:59 -0400 (EDT), MAROUNI Abbass wrote: On Tue, 29 Mar 2011 21:27:39 -0400 (EDT), Stephen Powell wrote: As I've said before, the devil is in the details. You need to find out *exactly* how your cross-over cable or null modem i

Re: Serial Connection -- shielding

2011-03-31 Thread Stephen Powell
On Wed, 30 Mar 2011 06:30:59 -0400 (EDT), MAROUNI Abbass wrote: > On Tue, 29 Mar 2011 21:27:39 -0400 (EDT), Stephen Powell wrote: >> As I've said before, the devil is in the details. You need to find out >> *exactly* how your cross-over cable or null modem is wired. There may >> be some asymmetry

Re: Serial Connection -- shielding

2011-03-30 Thread Moczik Gabor
MAROUNI Abbass wrote: The Two servers are exactly the same. getty and minicom have the same exact parameters. Which are top secret. :-) I thought it would be relativley simple since it's logically possible. I migth need to check the cables but I think it's the standard Null modem. I thoug

Null modem cable; was Re (2): Serial Connection -- shielding

2011-03-30 Thread peasthope
Abbass, > I migth need to check the cables but I think it's the standard Null modem. Yes, check the cable wiring with an ohmeter. All the hope in the world won't help. As Stephen said, > You need to find out > *exactly* how your cross-over cable or null modem is wired. There may > be some as

Re: Serial Connection -- shielding

2011-03-30 Thread MAROUNI Abbass
Le 30/03/11 03:27, Stephen Powell a écrit : On Tue, 29 Mar 2011 10:18:50 -0400 (EDT), MAROUNI Abbass wrote: I think that the discussion diverted somehow from my original question. My problem was the following : Two identical servers Z0& Z1 and a null modem cable. ttyS0 on Z0 connected to ttyS

Re: Serial Connection -- shielding

2011-03-30 Thread Scott Ferguson
On 30/03/11 01:18, MAROUNI Abbass wrote: > Le 28/03/11 10:30, Russell L. Harris a �crit : >> to: >> CC: >> * Stan Hoeppner [110328 06:24]: >>> Moczik Gabor put forth on 3/28/2011 12:01 AM: Stan Hoeppner wrote: > I think that the discussion diverted somehow from my original question. > > M

Re: Serial Connection -- shielding

2011-03-29 Thread Stephen Powell
On Tue, 29 Mar 2011 10:18:50 -0400 (EDT), MAROUNI Abbass wrote: > > I think that the discussion diverted somehow from my original question. > > My problem was the following : > Two identical servers Z0 & Z1 and a null modem cable. ttyS0 on Z0 > connected to ttyS1 on Z1. > on ttyS0 on Z0 I have

Re: Serial Connection -- shielding

2011-03-29 Thread MAROUNI Abbass
Le 28/03/11 10:30, Russell L. Harris a écrit : to: CC: * Stan Hoeppner [110328 06:24]: Moczik Gabor put forth on 3/28/2011 12:01 AM: Stan Hoeppner wrote: We bought DB25 plugs in bags of 100, and used spooled CAT5 as the noise rejection is many times that of CAT3, allowing greater distances ac

Re: Serial Connection -- shielding

2011-03-28 Thread Russell L. Harris
to: CC: * Stan Hoeppner [110328 06:24]: > Moczik Gabor put forth on 3/28/2011 12:01 AM: > > Stan Hoeppner wrote: > >> We bought DB25 plugs in bags of 100, and used spooled CAT5 as the noise > >> rejection is many times that of CAT3, allowing greater distances across > >> sprawling warehouses. >