RE: binary serial interface

["Mark Rivers" <rivers@cars.uchicago.edu>]

Pete,
 
You should be able to do that with asyn and custom device support.  You can have pending reads with infinite timeout to handle asynchronous messages from the device.  The support could ask for 6 bytes, and when that arrives, figure out how many more bytes to ask for.
 
Mark
 

________________________________

From: D. Peter Siddons [mailto:siddons@bnl.gov]
Sent: Thu 6/22/2006 2:03 PM
To: tech-talk@aps.anl.gov
Subject: binary serial interface



Hi all,
    I need to interface a USB motor controller which has a protocol
which consists of sequences of binary (i.e. non-ASCII) byte string
commands and responses. No end-of-string character is used, but the
length of the response is coded in one of the first six response bytes.
Some events (limit switches, e.g.) cause responses which are not a
direct response to a command. What is the best tool to use for such a beast?
Thanks,
Pete.