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Forum Index : Microcontroller and PC projects : CORRUPTION IN TERATERM

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OA47

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Joined: 11/04/2012
Location: Australia
Posts: 982

Posted: 01:26pm 09 Sep 2014

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If I leave Teraterm running for a couple of days some of the characters end up screwy. The characters seem to gather another bit or something but it doesn't seem to effect the numbers.

Can anyone throw some light on a cause? (happens on different PC's and different micromites)

Gizmo

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Joined: 05/06/2004
Location: Australia
Posts: 5111

Posted: 01:46pm 09 Sep 2014

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Would be interesting to know, if you close down and reopen Tereterm without touching the MicroMite, is the corruption still there?

That may narrow it down to a PC/Teraterm issue, or a Micromote issue.

Glenn

The best time to plant a tree was twenty years ago, the second best time is right now.
JAQ

TassyJim

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Posted: 02:02pm 09 Sep 2014

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It looks like some of the ASCII characters have the 8th bit set or some other translation.
Can you provide a copy of the text (not a screen shot)

TeraTerm can handle a lot of different encoding schemes other than plain ASCII so anything could have happened.

Jim

VK7JH
MMedit

OA47

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Posted: 06:50pm 09 Sep 2014

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TassyJim:

10-09-2014 09:14:24 | PV 12.95 | SLA 12.60 | TMP 14.00 | S1-2 0 0 PTT 0 CD 0 .
10-09-2014 09:14:54 | PV 12.97 | SLA 12.63 | TMP 14.00 | S1-2 0 0 PTT 0 CD 0 .
10-09-2014 09:15:24 | PV 12.99 | SLA 12.64 | TMP 14.00 | S1-2 0 0 PTT 0 CD 0 .
10-09-2014 09:15:54 | PV 12.99 | SLA 12.67 | TMP 14.25 | S1-2 0 0 PTT 0 CD 0 .
> MEMORY
Flash:
16K (81% of 20K) Program (653 lines)
54b ( 3% of 1536b) 3 Saved Variables

RAM:
17K (76%) 42 Variables
1K ( 2%) General
4K (22%) Free

Gizmo:
If I close down TeraTerm and restart it the corruption does clear. Interestingly the code above is cut and paste from what was shown on screen with corruption.

Gizmo

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Posted: 07:02pm 09 Sep 2014

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Hmm, that would indicate its a problem with TeraTerm.

Could you try Hyperterminal and see if the same thing happens?

Glenn

The best time to plant a tree was twenty years ago, the second best time is right now.
JAQ

OA47

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Posted: 07:07pm 09 Sep 2014

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I agree Gizmo that it is a problem with TeraTerm and it could possibly be evoked by the micromite program "printing" non-printable characters to the serial port when it reads a value from the inputs. I might alter the program to mask these characters and see what happens there.

TassyJim

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Posted: 09:43pm 09 Sep 2014

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I suspect that there is a sequence of characters that tricks TeraTerm into thinking it needs to use a 'strange' font/encoding.

The only time I have seen that is when I tried to display an XMODEM transfer.

There is probably a setting in TeraTerm that will stop it happening (but I don't know which setting!)

Next time try "Control / Reset Terminal" instead of restarting.

Jim

edit:

It looks like lowercase characters are upset and UPPERCASE ones are OK.Edited by TassyJim 2014-09-11

VK7JH
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robert.rozee
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Joined: 31/12/2012
Location: New Zealand
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Posted: 03:20am 10 Sep 2014

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from page 49 of the VT100 manual on geoff's website:

G0 Sets G1 Sets
Sequence Sequence Meaning
ESC ( A ESC ) A United Kingdom Set
ESC ( B ESC ) B ASCII Set
ESC ( 0 ESC ) 0 Special Graphics
ESC ( 1 ESC ) 1 Alternate Character ROM
Standard Character Set
ESC ( 2 ESC ) 2 Alternate Character ROM
Special Graphics

the following micromite code produces the results in the teraterm window you are seeing:

Print Chr$(27);"(0";
Memory
Input a$
Print Chr$(27);"(A";

rob :-)

OA47

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Posts: 982

Posted: 11:51am 10 Sep 2014

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Thanks Robert, Looks like I would only need to exclude Chr$(27) from printing to the console.

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