CarBytes - MAX232 circuit

[David Cooley]

At 07:16 AM 11/10/1999 -0600, you wrote:
>You can't use transistors very easy because the edges of a rs232  signal must
>have a slow rise time and fall time. If this part of the rs232 spec. is not
>followed on long runs of cable  you can get cross talk on the rs232 lines 
>and get
>garbage on your receive line. In most cases I have found short runs (under 
>6ft )
>work ok most of the time. Make life easy use a max232 ic .If you want my 
>circuit
>I will post it but none of these circuits are rocket science

The transistors are on the ALDL bus side.  They are there to combine the 
TTL RX/TX signals from the MAX232 to a single line.  They reduce the load 
on the bus as well.  RS232 side of the MAX232 goes straight to the PC.
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David Cooley N5XMT Internet: N5XMT at bellsouth.net
Packet: N5XMT at KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
We are Borg... Prepare to be assimilated!
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