[Coco] I2C - Is it possible?

[John Kent]

You need TXD, RXD and some handshake signal such as RTS to enable and 
disable the TTL outputput from the receiver.
You'd need something like a MAX242 except the EN* pin enables and 
disables both the TTL RX inputs, one of which you want to be the 
direction control. You'd wire the TTL RXD and TXD pins together.

The only other way would be to use a MAX232 with a tri-state buffer on 
the RXD output with the other handshake line controlling the output enable.

John.


On 26/07/2011 4:13 AM, Nick Marentes wrote:
> So, Is there a simple circuit to convert the RS-232 levels to IC2 
> compatible levels (including the -5v)?
>
> If the RS-232 could be made 'electrically' IC2 compatible, then all 
> that is left is the bit-banger software for the IC2 protocol right?
>
> Nick

-- 
http://www.johnkent.com.au
http://members.optusnet.com.au/jekent