Remote Control - Fundamentals R&S NRP
1144.1400.12 5.14 E-3
Status Reporting System
The status reporting system collects information on the device status and makes it available to the
output unit on request. Structure and function of this system are described in the following section.
Output Unit
The data output unit collects the information requested by the controller from the data set management.
It processes the information in line with the SCPI rules and makes it available in the output buffer.
Command Sequence and Command Synchronization
All commands are executed in the order in which they are sent. There is no overlapping of command
processing. (Exception: the commands INIT and CAL:ZERO:AUTO ONCE.) The user therefore can
determine the sequence of execution.
If a long program message is terminated by *OPC or *OPC?, the end of command processing is
signalled to the controller, provided the controller has been adequately programmed (Æ Table 5-1).
Table 5-1: Synchronization with *OPC, *OPC? and *WAI
Command Effect Programming of controller
*OPC
Sets the Operation Complete bit in the ESR after
all commands sent prior to *OPC have been
processed.
Set bit 0 in the ESE of the R&S NRP.
Set bit 5 in the SRE of the R&S NRP.
Wait for service request (SRQ).
*OPC?
Writes 1 in the output buffer after all commands
sent prior to *OPC? have been processed.
IEC/IEEE bus: the R&S NRP is addressed as a talker.
*WAI
Commands can be sent but they are only executed
after completion of all commands sent prior to
*WAI.
Dividing commands timewise before/after *WAI
serializes the command sequence.
*WAI is sent directly after the command that should be
completed before other commands can be executed.
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