Messages in this thread | | | Subject | RE: RS485 communication | From | Alan Cox <> | Date | 16 Mar 2003 00:56:01 +0000 |
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On Sat, 2003-03-15 at 12:46, David Woodhouse wrote: > On Thu, 2003-03-13 at 23:30, Chris Fowler wrote: > > Are you saying that for him to to use PPPD that he will have to write a > > program that will run on a master and tell all the slave nodes when they > > can transmit their data. In this case it would be ppp data. Hopfully > > in block sizes that are at least the size of the MTU ppp is running. > > You don't _need_ a master, although it's often an easy answer. > > You can have a token-bus arrangement like ARCnet does. In fact, the > ARCnet data sheets describing how it works may make interesting reading.
RS485 supports CDMA, thats more than enough to implement ppp nicely, all you have to do is a little abuse in the app or driver layer to block sending when carrier is asserted
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