#: 20193 S1/General Interest
    09-Aug-94  03:27:46
Sb: #20192-#RS232 response time?
Fm: Simon R Ashby 100111,2173
To: Bob van der Poel 76510,2203 (X)

Thanks, Bob and Kevin.
I am not party to the what the client is actually doing the rest of the time,
in the rest of his application (hush-hush), so I am guessing. It's his first
time with OS9, and I haven't used it either.
I will take it that he is doing something silly, and try to sort it out with
him and his vendor support. However, to fill in a bit for your interest:
We make, among other things, a video annotation board (8052-based, PL/M
programmed) which puts precision crosswires and text annotation on a
video-recording; in this case, the client has a 68020 VME rig which handles
other  instrumentation but which does not otherwise know about video. There is
a non-real-time setup protocol for positioning the display and crosswires etc,
plus a real-time mode where we provide a 'tick' character at 19200 baud every
video field sync. If they reply in 3ms with their 10-character data string then
we guarantee that the video recording annotation will be deterministic.
The data string contains text, numbers, flags and X-Y position for two
crosswires.
They claim to be unable to respond in 3ms - more like 25ms.
There you are. Thanks anyway.        Best regards Simon A

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