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ICHAPTER I
Interface Information
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3
I
HP -18 Interface
Installation
The HP 91220/5 is connected to the computer via the Hewlett-Packard Interface Bus (HP-IB). Refer to
Figure 3-1 for a list of the HP-IB interface
c~bles
used with HP computers.
Length
Accessory Number
1 metre
1 0833 A
2
metres
10833B
4
metres
10833C
0.5 metres
10833D
Figure 3-1. HP-IB Interface Cables
All the cables listed above are completely shielded to eliminate Radio Frequency Interference (RFI). The use
of unshielded cables will cause increased RFI in the area of operation.
I
CAUTION
I
Never turn the disc drive off or remove the disc from the
drive when the disc access light is on; doing so can cause loss of
data.
HP-IB Interface Restrictions
1. All the AC line switches (of the host system) must be turned "OFF" when connecting (and disconnecting)
devices to the system.
2. The total length of cable permitted in one bus system must
be
less than or equal to two metres times the
number of devices connected together (the interface card is considered one device).
3. The total length of the cable must not exceed 20 metres. For example, a system containing six devices
can be connected together with cables that have a total length less than or equal to 12 metres (six
devices x 2m/device
=
12 metres). The individual lengths of cable may be distributed in any manner
desired as long as the total length does not exceed the allowed maximum. If more than
10
devices are to
3-1
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