I
-
I
-
Front/Rear Panel
Connectors
As many as 14 HP-B instruments can be connected to the sweeper (15
total instruments in the system). The cables can be interconnected in a star
pattern (one central instrument with the
HP-lB
cables emanating from that
instrument like spokes on a wheel), or in a linear pattern (like boxcars on a
train), or a combination of the two. There are certain restrictions that must
be followed when interconnecting instruments:
l Each instrument must have a unique HP-B address, ranging from 0 to 30
(decimal). Refer to
“HP-IB
Lang/Address Switch” later in this chapter, or
“BDDRESS
’
in the “Instrument State Keys” chapter for information on
setting the sweeper HP-B address.
l In a two-instrument system that uses just one HP-B cable, the cable length
must not exceed 4 meters (13.2
ft).
l When more than two instruments are connected on the bus, the cable
length to each instrument must not exceed two meters (6.6 ft).
l The total cable length between all instruments must not exceed 20 meters
(65 ft).
Hewlett-Packard manufactures HPIB extender instruments (Models HP
37201A
and HP
37204AiB)
that overcome the range limitations unposed by
the cabling rules. These extenders allow twin pair cable operation up to 1 km
(3,280
ft),
and telephone modem operation over any distance. HP sales and
service offices can provide additional information on the
HP-IB
extenders.
7-11
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General