garbage on terminal screen

[zoonkai]

I'm trying to add a Sherwood 7000St terminal to my Sco system......i'm attaching it through a computone Rj45 Serial board....I have always kept top speed of terminals (mostly wyse 60's) at 19,200...Have tried 38,400 but always got garbage......well...i bought these sherwood terminals so i could utilize their capabilities of running 115,200 baud rate...they work fine up to 19,200....then i choose a faster speed and i get garbage....the computone program updates the files that need updating...and the speeds match on the Sco 5.0.5 box and the terminal....I'm using Xon/Xoff.....does anybody have any ideas what i should do to get my higher speed communication talking clearly between the terminal and the server

TIA
Donald [sig]<p>Donald (Zoonkai) Dixon<br><a href=mailto:donnan@don-nan.com>donnan@don-nan.com</a><br><a href=

http://www.don-nan.com>Don-Nan

Pump & Supply Co.</a><br> [/sig]

 

[edfair]

Suspect you are getting overrun between the time you terminal says xoff and the computone shuts the queue down. If this hunch is right, then DTR will help. [sig]<p>Ed Fair<br><a href=mailto: efair@atlnet.com> efair@atlnet.com</a><br><a href= > </a><br>Any advice I give is my best judgement based on my interpretation of the facts you supply. <br>
Help increase my knowledge by providing some feedback, good or bad, on any advice I have given.<br>
[/sig]

 

[zoonkai]

ok....what I ended up doing..(before your reply)...was after changing the terminal and computone speeds...and then had to disable and reenable that port.....it work great on my desk..(about 30 feet from the computone..)then i had another issue...my cable run for that particular terminal i'm replacing is well over 300 feet....so i tried 57,600 and it worked but got a few garbage characters (that could've led to skewed data input accidently) ever so often...expecially after running a finger command...finally tried 38.4 and it works great....it's not what i was hoping for but i guess for running cable that far without a repeater that is good enought

do you think DTR will help this new problem I'm having?? [sig]<p>Donald (Zoonkai) Dixon<br><a href=mailto:donnan@don-nan.com>donnan@don-nan.com</a><br><a href=

http://www.don-nan.com>Don-Nan

Pump & Supply Co.</a><br> [/sig]

 

[abovebrd]

Wow, I did not think any one was using serial terminals anymore. Just kidding. I have about 20 wyse60 terminals at my corporate office. I have a digi box spanning from the server to the digi concentrator about 300 to 400 feet with a serial cable (cat5 with rj45) The best I can get is 9600 and even thats slow.

Every where else across our WAN we have replaced serial terminals with win98 p/c's over tcp/ip

good luck,

-Danny [sig]<p>-Danny<br><a href=mailto: > </a><br><a href= > </a><br> [/sig]

 

[edfair]

You're lucky to get the speed you're getting. DTR won't help you. Problem is the line driver having to pump up the empty wire and basically doing a tide job on the voltage level.
Don't look at the signal with a scope or you'll have a scope on your heart.
And if you are getting garbage on keying it comes from the capacitance coupling within your cable. I have several wy60s on 30 feet of satin that I refuse to listen to complaints about when the screen goes reverse or garbage. Just put a note on for users, &quot;let screen fill before proceeding&quot;. [sig]<p>Ed Fair<br><a href=mailto: efair@atlnet.com> efair@atlnet.com</a><br><a href= > </a><br>Any advice I give is my best judgement based on my interpretation of the facts you supply. <br>
Help increase my knowledge by providing some feedback, good or bad, on any advice I have given.<br>
[/sig]

 

[zoonkai]

so it looks like i should count my lucky stars i'm getting the speeds i'm getting....

you wanna here something funny.....the wyse60's i have are capable of 38,400 ...but i can't get anything out of them...just a period everytime you hit hte enter key.....i have to keep them at 19,200....however these sherwoods i could get mostly good at 57,600 and seems to work find at 38,400......go figure...

I appreciate it guys.....and danny...unfortunately we are still using serial terminals....in fact...gonna be adding more and more...i think i'm up to about 35 or 40 out there now....

Zoonkai [sig]<p>Donald (Zoonkai) Dixon<br><a href=mailto:donnan@don-nan.com>donnan@don-nan.com</a><br><a href=

http://www.don-nan.com>Don-Nan

Pump & Supply Co.</a><br> [/sig]

 

[AndyBo]

Back in the good old days, before Category 5 UTP, the maximum run for standard RS232 cable was 125 feet. Anything over this and you are going to have the problems you described. I once had a few Wyse 60s that sat about 500 feet away from the server room. Putting some line drivers in for these terminals fixed all the &quot;garbage on screen&quot; problems we had been having.

We were able to run these at 115200, but I tended to leave them set at 38400. (Why? A quick performance boost when the users get used to the system speed after a few months of use and start comlaining that it's slow. A quick trip to set the screens to 57600 or more to &quot;speed the system up&quot;...) [sig]<p> Andy Bold<br><a href=mailto: > </a><br><a href= > </a><br>"I've probably made most of the mistakes already, so hopefully you won't have to..." Me, most days.[/sig]

 

[edfair]

The speed issue is a combination of wire size, interwire capacitance, and the line driver that is filling up the empty wire. I've driven terminals up to 300 feet at 9600 b using 24 ga wire. Cat5 goes further. You want distance, go for the line drivers, which are current devices like the western union devices of yore, which could handle 3000 miles but at a much lower baud rate. Any of the datacomm catalogs should show them. Think they are about $80.00 per end and require 4 wires. In a residential hospital complex I found them to almost equal fibre in overall use. And I'm not knocking fibre by saying this. [sig]<p>Ed Fair<br><a href=mailto: efair@atlnet.com> efair@atlnet.com</a><br><a href= > </a><br>Any advice I give is my best judgement based on my interpretation of the facts you supply. <br>
Help increase my knowledge by providing some feedback, good or bad, on any advice I have given.<br>
[/sig]

 

[bigscouse]

Tut Tut Andy, giving away trade secrets!!!!
Users could be looking in. [sig]<p>Ged Jones<br><a href=mailto:gedejones@hotmail.com>gedejones@hotmail.com</a><br><a href= > </a><br>Top man[/sig]