Agilent Technologies E2730A, Installation And Operation Manual

Page: 35 / 75

E2730A VXI RF TUNER
3-2 OPERATION
3.3 TUNER CONTROL USING THE VXI INTERFACE
The E2730A is configured as a Message-Based and Memory-Based
Servant Device; that is, a device that has communications registers
accessible by other devices. The tuner is controlled by using Word Serial
Commands and IEEE-488.2 Protocol. Binary registers may also be used
for some of the most common functions. The following paragraphs
provide further details on how the E2730A is controlled in the VXI
architecture using either command method.
3.3.1 VXIBus/E2730A INTERFACE
All tuner operations are directed by commands received over the VXIbus.
VXIbus word serial commands are processed by the VXI Interface to
control and configure the E2730A as a message-based VXIbus module.
IEEE 488.2 ASCII commands/queries are then transmitted to the E2730A
via Word Serial Byte Available commands. Refer to
Table 3-1 for a
listing of Word Serial Commands.
Responses to IEEE 488.2 ASCII queries are transferred to the VXIbus in
response to the Word Serial Byte commands.
Table 3-1. Word Serial Commands
Command Description
Abort Normal Operation Causes device to cease normal operation. Device returns to its
default configuration, aborting all operations.
Begin Normal Operation Notifies device that it can begin normal operation
Byte Available Used to send a byte of data from a Commander to a Servant.
Byte Request Used to request a byte of data from a Servant by a Commander.
Clear Clears the VXIbus interface and any pending operations.
End Normal Operation Causes device to cease normal operation in an orderly manner.
Read Protocol Determines which protocols in addition to the Word Serial
protocol that the Servant supports.
Read Protocol Error Requests the most recent error code from the Servant.
Read STB Requests the status byte from the Servant.
Assign Interrupter Line Assigns VXIbus IRQ line to an Interrupter.
Read Interrupter Line Used to determine which VXIbus IRQ line that a particular
Interrupter in the Servant device is connected to.
Read Interrupters Used to determine the number of Interrupters within a Servant
device.