HP 3457A Service Manual page 36

Installation 3457A
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Figure 2-4, Typical HP-IB Interface Connection
2-18 INTERFACE CONNECTIONS
2-19. Control Interface
2-20. The HP Model 3457A is compatible with the Hewlett-Packard Interface Bus (HP-IB). Connection is
made using an HP-IB interface cable to connect the controller to the appropriate connector on the rear of
the HP 3457A, A typical HP-IB interface system is shown in Figure 2-4. The system shown uses three HP-IB
interface cables to connect the instruments in the system. Each interface connector is both a male and
female connector to permit connection to an instrument and another interface cable. As many as 15 in-
struments can be connected by the same interface bus. However, the maximum length of cable used to
connect a group of instruments should not exceed the number of instruments times 2 meters (6.56 ft.), or a
maximum of 20 meters (65.6 ft.), whichever is less. Refer to Figure 2-5 for a pictorial view of the HP-IB
connector and its pin designations.
H P-IB is Hewlett-Packard's implementation of TE
Digital Interface for Programmable Instrumentation
Std. 488-1978, "Standard
2-21. HP-IB ADDRESS SELECTION
2-22. The HP-IB address is programmed from the front panel or over the interface bus. The address is set to
decimal "22" at the factory. This corresponds to an ASCII listen address of "6" and talk address of "V". The
HP 3457A display momentarily shows the current address code whenever the instrument is turned on or
reset.
When choosing an address, be certain it is unique (o the system involved. Some con-
trollers have an H P-IB address. As an example: HP Series 200 computers have an
address of decimal 21.
2-4