IEEE-488 Programming
3-22
3.3
Bus connections
The Model 6512 is to be connected to the IEEE-488 bus
through a cable equipped with standard IEEE-488 connec-
tors, an example of which is shown in Figure 3-6. The con-
nector is designed to be stacked to allow a number of parallel
connections. Two metric screws are located on each connec-
tor to ensure that connections remain secure.
Figure 3-6
IEEE-488 connector
A typical connecting scheme for the bus is shown in Figure
3-7. Each cable normally has the standard connector on each
end. These connectors are designed to be stacked to allow a
number of parallel connections on one instrument.
NOTE
To avoid possible damage, it is recom-
mended that you stack no more than three
connectors on any one instrument.
Figure 3-7
IEEE-488 connections
CONTROLLER
INSTRUMENT
INSTRUMENT
INSTRUMENT
Connect the Model 6512 to the cable as follows:
1. With the power off, line up the connector on the cable
with the connector on the rear panel of the instrument.
See Figure 3-8 for connector location.
2. Tighten the screws securely, but do not overtighten
them.
3. Add additional connectors from other instruments, as
required.
4. Make sure the other end of the cable is properly connect-
ed to the controller.
NOTE
The IEEE-488 bus is limited to a maxi-
mum of 15 devices, including the control-
ler. Also, the maximum cable length is
limited to 20 meters, or 2 meters times the
number of devices, which ever is less.
Failure to heed these limits may result in
erratic bus operation.
Figure 3-8
Model 6512 rear panel IEEE-488 connector
3.4
Primary address
The Model 6512 must receive a listen command before is
will respond to addressed commands. Similarly, the unit
must receive a talk command before it will transmit its data.
The Model 6512 is shipped from the factory with a pro-
grammed primary address of 27. Until you become more fa-
miliar with your instrument, it is recommended that you
leave the address at this value because the example programs
included in Appendix D of this manual assume that address.
The primary address may be set to any value between 0 and
30 as long as address conflicts with other instruments are
avoided. Note that controllers are also given a primary ad-
dress, so you must be careful not to use that address either.
Most frequently, controller addresses are set to 0 or 21, but
you should consult the controller’s instruction manual for de-
SH1
AH1
T5
TE0
L4
LE0
SR1
RL0
PP0DC1
DT1
C0
E1
Summary of Contents for 6512
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