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BINARY COMMAND
PROTOCOL
3.3.5 INTERRUPTERS
3-8
A specific protocol is required when implementing binary commands. The
control application must first check to see that any previous binary
commands have been completed. This is done by reading the binary
command register to see that it is clear. If it is not clear, then the
application must wait until it is. Then a new binary command may be
entered. First, the application must update the desired data in the data
registers (2C-34) and then set the bits in the binary command register for
each data parameter that is to be updated. When the binary command
register is written, the E2730A will start processing the new binary
command data. The data registers must not be rewritten until the binary
command register has been cleared by the tuner. In the event multiple bits
are set in the command register, processing will be in sequence indicated
below:
1.
FRQ
2.
Manual Attenuation
2.1
ATN
2.2
PAM
The frequency command is processed first because it takes the longest to
complete.
After the tuner has processed one of the commands, the corresponding bit
in the binary command register is cleared. The application must wait until
all the bits in the binary command have been cleared before issuing
another set of commands. However, the application may take advantage of
polling the binary command register and updating the data registers before
the tuner has processed the last piece of data; i.e., while the tuner is
processing attenuation data, the user can update the frequency data.
The E2730A tuner is a message-based VXI device with interrupter
capability. The tuner requires one VXIbus interrupt line for operation.
The interrupt line is used when the E2730A tuner has asserted a service
request (SRQ). The "assign interrupt line" word serial command (see
paragraph 3.3.1) is used to assign interrupt lines to a VXIbus device.
The tuner asserts an SRQ from error status conditions. The details of SRQ
generation are presented in paragraph 3.4.4.
E2730A VXI RF TUNER
OPERATION
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