Re: TI-H: Radio link.

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: Radio link.
From: Grant Stockly <gussie@stockly.com>
Date: Fri, 29 Oct 1999 02:26:04 -0800
In-Reply-To: <199910291045.LAA21784@flash.dalnet.se>
Reply-To: ti-hardware@lists.ticalc.org


Your bit status isn't clear.  Why not just designate bit 0 for pin 0 and
bit 1 for pin 1?  Then just transmit that as fast as you can in packets
with echo.

Thats the best way to make sure all data gets where it needs to go without
errors.

Grant

>First I will say that the price was wrong. It should be $10 not $100.
>I'm sorry for that.
>
>I will have a small onechip computer for doing the transfer.
>The pin state I will send when any pin is low. Maybe this
>will take a lot of bits send in transmitting. Ex.
>000 pin 0 is low. 001 pin 1 is low. 010 pin 0 goes high and 011 pin
>1 goes high. It sending on a change in state of pins. When it's no
>change the link is in listening mode.
>This is not so effective as encodeing a protocol and send with RS-232.
>And if you send with RS-232 or some other homemade protocol you can do more
>advance faliure secure things.
>And I have thought of compressing the data also. If you for example send
>Z80 programs this is a really nice code to pack. But the first thing is
>to make the state of pin protocol work. It is really good if you people come
>with some ideas and so on.
>
>The radio link is on a swedish page. But I put the .pdf file on
>www.big.du.se/~pea
>
>It is a little tricky to make but the layout is in the pdf-file and
>that is a relief.
>
>/PEA
>
>
>
>
>At 13:02 1999-10-28 -0500, you wrote:
>>
>>From: Grant Stockly <gussie@stockly.com>
>>>>First I going to have a direct connection. The link looks just like a
>>cable
>>>>to the TI.
>>>>Then you should be able to switch a switch were the link can recognize
>>>>different protocols from TI ex. I2C. Between the links there will be
>>>>RS-232 maybe with some multi-user support. You have transfer rate of 9.6
>>Kbps.
>>>
>>>Why don't you save yourself and others time by just transmitting line level
>>>state over the radio?  Any protocol can be used (even RS232) and the thing
>>>would work great.
>>
>>Sounds like that is what the first mode was.  That would be the prefered way
>>to do a radio link, since it then supports any protocol the software is
>>using.
>>
>>What I was really asking about was details on the protocol.  IE, how are you
>>going to handle transmitting the state of the wires?
>>
>>I'm curious who produces the transceiver you are using, is there a web page
>>for it somewhere?
>>
>>DK
>>
>>
>>
>>
>>
>>

References:

Re: TI-H: Radio link.

From: pea@dalnet.se