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E2730A VXI RF TUNER
Command
RCE nrf
STO nrf
3.4.4 COMMUNICATION MESSAGES AND SRQ OPERATIONS
OPERATION
Table 3-9. Store and Recall Operations
Response
Recall and execute the specified memory
channel.
Range: 1 to 200 (valid memory channels)
Store current parameters to the memory channel
specified.
Range: 1 to 200 (valid memory channels)
The mnemonics in this message category are always valid.
commands establish communications and control the event interrupts
between the E2730A and the controller and do not alter the hardware
functions of the tuner.
category are described in the following paragraphs.
Most of the messages in this category are used to control and monitor the
SRQ operation of the tuner. The exceptions are the Identity query (*IDN)
which responds with the tuner's identity, a future Option query (*OPT?),
and the Request Token (RTK) command. The RTK command allows the
tuner to indicate (with a numeric argument) who is in control. This
command can be used to arbitrate control between the VXI interface and
the RS-232 interface of the tuner.
The E2730A supports the IEEE 488.2 SRQ capability. This capability is
implemented through a series of layered enable and status registers. The
tuner is capable of generating SRQ interrupts for numerous events. These
include communication errors and hardware errors. The SRQ Structure
Diagram is shown in Figure 3-1. This diagram shows the layers of enable
and status registers that support the SRQ operation.
The highest level registers are the Service Request Enable (*SRE) and
Status Byte (*STB) registers. The *STB register contains the Message
Available (MAV) bit, Event Status Bit (ESB) and Request for Service Bit
(RQS). Each of these event bits (except the RQS) may be enabled via the
*SRE register.
SRQ generation occurs when the event bit and its
corresponding enable bit are both true. The event bits are set regardless of
the status of the corresponding enable bit.
responsible for "anding" the status register with the enable register to
determine the cause of the SRQ.
destructively.
The event bits are cleared when their corresponding
registers are read. The RQS bit indicates that an enabled event has set
SRQ in this tuner. This bit is cleared by the VXI Spool Read STB
operation.
Description
The commands associated with this message
The user's application is
Both registers may be read non-
These
3-15
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