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Installation and Configuration
CAUTION
Adding termination resistors to more than one card in an HP-(B system may
result in permanent damage to any or all cards in the system.
NOTE
A powered-off System Controller will not allow the system to be used (as
long as the System Controller is connected), because HP-J8 bus drivers
cannot drive the powered-down termination resistors.
5.
Bus configuration is unimportant as long as the guidelines in the following
paragraphs are observed.
Medium/Slow-Speed Configurations
3-2
For proper operation of the HP-IB bus at medium/slow operating speeds, observe
the following guidelines:
l.
Counting the HP-JB Channel Card as a device, up to 15 HP-(B devices may
be connected to the bus.
2.
The maximum length of cable permitted is two metres (6.56
ft)
per
connected device, or 20 metres (65.6 ft), whichever is less.
For example.
when connecting an HP-IB card to the first peripheral device, a cable of
liP
to 4 metres (13.1
ft)
is allowed (2 devices X 2 metres/device). The kngth
between adjacent devices is not normally critical as long as the overall Jimil
is not exceeded.
3.
At least four out of every five devices should be powered on.
4.
The optional load resistor pack MUST NOT BE INSTALLED. The 18-pin
Dual In-Line Package (DIP) resistor pack is marked 1810-0081.
If it is
installed in "HI-SPD" storage socket UI23 behind connector J2, it must be
removed and placed in the socket labeled "NRML-SPD STORAGE" (U 106).
Refer to the following paragraph for high-speed operation.
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