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R&S OSP
command during command recognition and execution. The receipt of a DCL clears the
input buffer and immediately initiates a message to the command recognition.
6.3.2 Command Recognition
The command recognition stage analyzes the data received from the input unit. It
proceeds in the order in which it receives the data. Only a DCL is serviced with priority,
e.g. a ROUTe:CLOSe ... command (set relay(s) to specified condition(s)) is only
executed after the commands received before. Each recognized command is
immediately transferred to the data set but not executed immediately.
The command recognition detects syntax errors in the commands and transfers them
to the status reporting system. The rest of a command line after a syntax error is still
executed, if possible. After the syntax check, the range of the numerical parameters is
checked, if required.
If the command recognition detects a delimiter or a DCL, it also requests the data set
to perform the necessary instrument hardware settings. Subsequently it is immediately
prepared to process further commands. This means that new commands can already
be serviced while the hardware is still being set ("overlapping execution").
6.3.3 Data Base and Instrument Hardware
The expression "instrument hardware" denotes the part of the instrument fulfilling the
actual instrument function. The controller is not included. The data base manages all
the parameters and associated settings required for the instrument hardware.
Setting commands lead to an alteration in the data set. The data set management
enters the new values (e.g. relay conditions) into the data set, however, it only passes
them on to the hardware when requested by the command recognition. This can only
occur at the end of a command line, therefore the order of the setting commands in the
command line is not relevant.
The commands are only checked for their compatibility among each other and with the
instrument hardware immediately before they are transmitted to the instrument
hardware. If the instrument detects that execution is not possible, an "execution error"
is signaled to the status reporting system. All alterations of the data set are canceled,
the instrument hardware is not reset. Due to the delayed checking and hardware
setting, however, impermissible instrument states can be set for a short period of time
within one command line without this leading to an error. At the end of the command
line, however, a permissible instrument state must have been reached again.
Queries induce the data set management to send the desired data to the output unit.
6.3.4 Status Reporting System
The status reporting system collects information on the instrument state and makes it
available to the output unit on request. The exact structure and function are described
in
chapter
Operating Manual 1505.3896.12 - 14
6.4, Status Reporting System.
Remote Control
141
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