Table of Contents
Advertisement
Front/Rear Panel
Connectors
as 14 I-P-II3 instruments
As many
(15 total instruments in the system). The cables can be interconnected in
a star pattern (one central instrument with the HP-IB 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. See Figure l-5 in Chapter 1.
There are certain restrictions that must be followed when interconnecting
instruments:
Each instrument must have a unique HP-IB address, ranging from 0 to 30.
l
In a two-instrument system that uses just one HP-lB cable, the cable length
l
must not exceed 4 meters (13.2 ft).
When more than two instruments are connected on the bus, the cable
l
length to each instrument must not exceed two meters (6.6 ft).
The total cable length between all instruments must not exceed 20 meters
l
(66 ft).
Hewlett-Packard manufactures HP-IB extender instruments (Models
HP 37204A) and HP 37204B) that overcome the range limitations imposed 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.
Remote Enable
End Or Identify
I
8-8
can be connected to the analyzer
Table 8-l. General Bus Management lines
Controls whether the bus is in Command Mode IATN TRUE1 o r Oata Mode
Initializes the interface to an idle state Ino activity on the bus).
Alerts the Controller to a need for communication.
R E N
Enables devices to respond to Remote Program Control when addressed
to listen.
Indicates last data byte of 8 multibyte sequence; also used with ATN to parallel
E O I
poll devices for their status bit.
Advertisement
Table of Contents
