[time-nuts] Timelab, two SR620s and losing samples
phk at phk.freebsd.dk
Sun Jan 17 11:52:13 UTC 2016
In message <569B61CF.3030708 at rubidium.dyndns.org>, Magnus Danielson writes:
>> This is a common misunderstanding: Talk-only does *not* protecting you
>> against timing issues on GPIB.
>> On RS-232, yes, but not on GPIB.
>Agree, to some degree. It's not a guarantee.
>I think you should develop that line of thought, to detail why it helps
>on GPIB and why not on serial.
It's really very simple: RS-232 sends blind, you don't even need to
know if there is a receiver or what it does. If the receiver cannot
keep op, data is simply lost.
GPIB handshakes every byte, so the actions of the receiving end affects
the transmitting end - in particular if the receiver cannot keep up.
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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