HP 22A HP-IB General Information, Interconnecting Cables, HP-IB Instrument Nomenclature, Listener

HP-IB General

Information

Interconnecting Cables

Figure C-2 shows the synthesizer rear-panel HP-IB connector and suitable cables, and describes the procedures and limitations for interconnecting instruments. Cable length restrictions, also described in Figure C-2, must be observed to prevent transmission.

Instrument Addresses Each instrument in an HP-IB network must have a unique address, ranging in value from 00-30 (decimal). The default address for the synthesizer is 19, but this can be changed using the My adrrs softkey or rear panel switch as described in the reference chapter (Chapter

2)under the “8360 Adrs” entry (the examples in this section use 19 as the address for the synthesizer). Other instruments use a variety of procedures for setting the address, as described in their operating manuals, but typically either a rear panel switch or a front panel code is used.

HP-IB Instrument Nomenclature

Programming the Synthesizer

An HP-IB instrument is categorized as a “listener,” “talker,” or “controller,” depending on its current function in the network.

Listener

A listener is a device capable of receiving data or commands from other instruments. Any number of instruments in the HP-IB network can be listeners simultaneously.

Talker

A talker is a device capable of transmitting data or commands to other instruments. To avoid confusion, an HP-IB system allows only one device at a time to be an active talker.

Controller

A controller is an instrument, typically a computer, capable of managing the various HP-IB activities. Only one device at a time can be an active controller.

The synthesizer can be controlled entirely by a computer (although the line POWER switch must be operated manually). Several functions are possible only by computer (remote) control. Computer programming procedures for the synthesizer involve selecting an HP-IB command statement, then adding the specific synthesizer (SCPI, Analyzer, or CIIL) programming codes to that statement to achieve the desired operating conditions. The programming codes can be categorized into two groups: Those that mimic front panel keystrokes; and those that are unique, and have no front panel equivalent.

1-56 Getting Started Programming