About rs232 on motorola mpc8260 ads board

About rs232 on motorola mpc8260 ads board

[zzh]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 956 bytes --]


Hello,everyone.
I'm trying to make the SCC1 drived rs232 port of a motorola
mpc8260 ads board work.The manual says it can direct connect
to pc com port.But it seems the output from this board is not
rs232 voltage.i.e -3 to -12 for logical one,3 to 12 for logical
zero,nor is it TTL,it seems that it use 0 for logical 1,5.0v for
logical 0,so it is rather annoying. I have to invert the output
from 8260 ads,then use a TTL->232 converter to connect with PC,
it works when i send char from 8260,but cannot work in the
other direction.
In addition,for a while,it output 232 signal,but i cannot
reproduce it!!
Does anyone has experience with this board?
Thanks for your advice.
                    davidzhang
                    3/22/2000

_____________________________________________
Ê׶¼ÔÚÏß--ÖйúÈ˵ÄÍøÉϼÒÔ° http://www.263.net
@263.netÖйú×î´óµÄÔÚÏßÓÊ¾Ö http://freemail.263.net

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

Re: About rs232 on motorola mpc8260 ads board

[linuxppc_em]

----- Original Message -----
From: zzh <david-1z@263.net>
To: <linuxppc-embedded@lists.linuxppc.org>
Sent: Wednesday, March 22, 2000 4:28 PM
Subject: About rs232 on motorola mpc8260 ads board


>
> Hello,everyone.
> I'm trying to make the SCC1 drived rs232 port of a motorola
> mpc8260 ads board work.The manual says it can direct connect
> to pc com port.But it seems the output from this board is not
> rs232 voltage.i.e -3 to -12 for logical one,3 to 12 for logical
> zero,nor is it TTL,it seems that it use 0 for logical 1,5.0v for
> logical 0,so it is rather annoying. I have to invert the output
> from 8260 ads,then use a TTL->232 converter to connect with PC,
> it works when i send char from 8260,but cannot work in the
> other direction.
> In addition,for a while,it output 232 signal,but i cannot
> reproduce it!!
> Does anyone has experience with this board?
> Thanks for your advice.
>                     davidzhang
>                     3/22/2000
>
> _____________________________________________
> 首都在线--中国人的网上家园 http://www.263.net
> @263.net中国最大的在线邮局 http://freemail.263.net
>


Pavel Roskin is right , that means to check RTS(from ads) or enable it manually.

b.r.
john zhan.
hacking time.


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

Re: About rs232 on motorola mpc8260 ads board

[Pavel Roskin]

Hello!

> it works when i send char from 8260,but cannot work in the
> other direction.

Make sure that your communication program ignores the modem lines.
I had this problem with IVT (http://home.wxs.nl/~ruurdb/IVT.HTM).
Try TeraTerm PRO (for Win32) or Minicom (for *X), they are known to be Ok.

Pavel Roskin


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/