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Re: Audio Amplifiers DIY
Hi Shane
Anything
i have done with rs 232 i have used max232
chips............Rs485 i have used half duplex chips..havnt done any
full
duplex stuff ...........i have used the LT 485 chip............It would
be
nice to have an on board link to enable or disable the terminator
resistor........Have a look at this link it has a schematic using
rs232 or
rs485 using a pic.......the tx and rx pins joined together and connected
to
an i/o pin ( i assume half duplex)...................
http://www.dontronics.com/dt106.html
HTH
Frank
----- Original Message -----
From: "Shane Harrison" <shane.harrison@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Monday, October 21, 2002 6:27 PM
Subject: RE: [ukha_d] Audio Amplifiers DIY
> Hi there,
>
> Well, enough people expressed an interest in the amplifier so I'll
put
> some effort in an put provision for both RS232 and RS485.
>
> Can any one out there supply proven designs that work with PICS or
at
> least answer the following questions:
> 1) RS232 - use MAX232 ?
> 2) RS485 - use MAX481 (half duplex) or MAX491 (full duplex)
> 3) Termination resistors need to be strappable on RS485 ?
> 4) Does the transmitter enable pin on the RS485 drivers need to go
back
> to the PIC (I assume RX enable doesn't) ?
>
> Replying offlist might be more appropriate if it gets a bit
involved.
>
> Cheers and thanks
> Shane
>
>
>
> http://www.automatedhome.co.uk
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