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vrf PassTru

Question asked by scott_morrison on Mar 21, 2002
Hi guys,
     I think you'll find that you need to know at least three addresses:
The NA's address, ie 716
The NA's passthru address, ie 717 (check on analyzer)
The PM's address, ie 13 (slaved to the NA, not on the main bus)

The passthru then works like:
write @716 "addrpass 13" (I don't know about the whitespace).  This puts the
NA in passthru mode and points the passthru 'pipeline' to the NA's address
13.

write @717 "tr3" (any power meter command)  The passthru pipeline, already
having been pointed at the slaved address 13, will send all commands to the
slaved address.

Any command sent to 716 will automatically terminate the passthru mode.

You can also talk to multiple slaved pieces of equipment simply by
redirecting the passthru.  For example if there were another source slaved
to the analyzer at address 19 and 20 you could talk them like:
write @716 "addrpass 13"
write @717 "somePMcommand"
write @716 "addrpass 19"
write @717 "someSOURCE1command"
write @716 "addrpass 20"
write @717 "someSOURCE2command"
write @716 "someNAcommand" (terminates passthru mode)

Sometimes it is neccessary to use the passthru, change the language mode of
the slaved equip (some features are not implemented in all languages),
perform some operation, and exit.  Note that if you lose control of this
process and the equipment is part of the NA system, you may hang the system
because you've left the equipment in some state of incompatible language
mode (thus the NA cannot reassert control).

Hope this helps,

Scott Morrison
(707) 577-3521
Fax:  577-4942



-----Original Message-----
From: M Watts [mailto:MikeJWatts@compuserve.com]
Sent: Friday, March 22, 2002 6:59 AM
To: Hazelwood, Joe
Cc: 'vrf@lvld.agilent.com'
Subject: vrf PassTru


Hello Joe,
          I'm hoping someone else may be able to help you out here but,
from my recollection, it is done by secondary addressing.  The address you
put into the VEE instrument manager ( and I'm assuming you do not see the
power meter when you press the 'find' button ) is a combination of both
addresses.  E.g. if the analyser is at address 16 and the power meter at 09
then I think you can control the power meter directly on address 1609.

If I'm wrong there then I would look (a) for a command which passes the
information through ( unlikely ) or (b) a setup which allows the
passthrough of control to the power meter ( which will probably assign a
new primary i.e. 2-digit address to the power meter ).


Hope that helps,

Mike Watts
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