Remote Control
R&S
®
FPC
342
User Manual 1178.4130.02 ─ 07
CONDition part
12
13
14
15
3
2
1
0
PTRansition part
12
13
14
15
3
2
1
0
NTRansition part
12
13
14
15
3
2
1
0
EVENt part
12
13
14
15
3
2
1
0
ENABle part
12
13
14
15
3
2
1
0
& & & & & & & & & & & & & &
+
Sum bit
to higher order register
& = logical AND
+ = logical OR
of all bits
Figure 19-5: Model of the status register
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
(
PTR
) 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
(
NTR
) part also acts as an edge detector. When a bit of
the
CONDition
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 the user can define which state transition of the
condition 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 the
user. Reading the register clears it. This part is often equated with the entire register.
Status Reporting System
