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Network operation and remote control
R&S
®
MXO 4 Series
389User Manual 1335.5337.02 ─ 05
The output buffer contains the messages that the instrument returns to the control-
ler. It is not part of the status reporting system but determines the value of the MAV
bit in the STB and thus is represented in the overview.
All status registers have the same internal structure.
16.5.2 Structure of a SCPI status register
The STATus:OPERation and the STATus:QUEStionable SCPI status registers
consists of five parts.
The individual bits are independent of each other, i.e. each hardware status is
assigned a bit number, which is valid for all five parts. Bit 15 (the most significant bit) is
set to zero for all parts. Thus, the contents of the register parts can be processed by
the controller as positive integers.
Description of the five status register parts
The five parts of a SCPI status register have different properties and functions:
●
CONDition
The CONDition part reflects the current instrument status. For summary bits, the
CONDition bit mirrors the sum of the enabled EVENt bits of the next lower regis-
ter.
This register part can only be read, but not written into or cleared. Its contents are
not affected by reading.
●
PTRansition / NTRansition
The two transition register parts define which state transition of the CONDition
part (none, 0 to 1, 1 to 0 or both) is stored in the EVENt part.
The Positive-TRansition part acts as a transition filter. When a bit of the
CONDition part is changed from 0 to 1, the associated PTR bit decides whether
the EVENt bit is set to 1.
– PTR bit =1: the EVENt bit is set.
– PTR bit =0: the EVENt bit is not set.
All positive transitions are enabled by default.
This part can be written into and read as required. Its contents are not affected by
reading.
Remote control - status reporting system
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