Dear List,
i wonder if anyone has ever played around with this device:
http://cel-mar.pl/en/addressable_rs485rs422_1wire_m401wa.htm
or even had success in using it with owfs ...
it basically has a DS2480B behind a microcontroller which handles
the communication (and adressing of the device) in form of "frames" of
960bytes max length ...
so the question arises - from the development point of view - if owfs
can easily be extended to support such kind of "framing" when
communicating with a DS2480B.
as far as i understand the datasheet at
http://cel-mar.pl/files/io/io_ada-401wa_en.pdf
The ADA converter, expects a new "frame" (with prefixed id) if
for a given timeout (e.g. 3ms) no communication occurs on the RS485
bus ...
the "Frame" is composed of the Address byte of the ADA converter
plus the payload which gets sent to the DS2480B.
so owfs has to send all bytes to DS2480B belonging to one
"transaction" with no delays larger than this timeout, otherwise
the id has to be inserted again ... is this posible in OWFS ?!?
On the other hand, the ADA converter itself checks the 1wire
communication, and, if the DS2480B reports an error (e.g. checksum
mismatch) it dont sends back the answer to the RS485 bus - can owfs
handle this situation ?!?!
a valid answer again is prefixed by ADA's address followed by the
response from DS2480B ...
Finally the "break" signalling (to let the DS2480B reinitailise
itself) needs to be signalled differently (by sending <ADDR>-C1C1C1)
Background: i have a customer who wants to use this kind of adapter
for remote monitoring ... so if there is no support existing, i will
have to implement it ;-) - and he wants a rough estimation of the
effort needed ;)
so any information on these topics is warmly welcome ;)
regards,
marcus.
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