Remote Commands
R&S
®
Cable Rider ZPH
238
User Manual 1321.0950.02 ─ 03
Cable Rider ZPH. 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 integer.
Figure 11-6: The status-register model
CONDition part
The CONDition part is directly written into by the hardware or the sum bit of the next
lower register. Its contents reflects the current instrument status. This register part can
only be read, but not written into or cleared. Its contents is not affected by reading.
PTRansition part
The Positive-TRansition part acts as an edge detector. 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.
This part can be written into and read at will. Its contents is not affected by reading.
NTRansition part
The Negative-TRansition part also acts as an edge detector. When a bit of the CONDi-
tion part is changed from 1 to 0, the associated NTR bit decides whether the EVENt bit
is set to 1.
NTR-Bit = 1: the EVENt bit is set.
NTR-Bit = 0: the EVENt bit is not set.
This part can be written into and read at will. Its contents is not affected by reading.
With these two edge register parts, you can define which state transition of the condi-
tion part (none, 0 to 1, 1 to 0 or both) is stored in the EVENt part.
EVENt part
The EVENt part indicates whether an event has occurred since the last reading, it is
the "memory" of the condition part. It only indicates events passed on by the edge fil-
ters. It is permanently updated by the instrument. This part can only be read by you.
Reading the register clears it. This part is often equated with the entire register.
Remote Control - Commands
