EM510
Remote Control via LAN
4065.7763.32-01.00
5.130
NTRansition section
the Negative-TRansition section also acts as an edge detector. When a bit of
the CONDition section 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 section can be written into and read in any way. Its contents are not
changed during reading.
With these two edge register sections the user can define which state
transition of the condition section (none, 0 to 1, 1 to 0 or both) is stored in the
EVENt section.
EVENt section
the EVENt section indicates whether an event has occurred since the last
reading; it is the "memory" of the CONDition section. It only indicates events
passed on by the edge filters. The EVENt section is permanently updated by
the device. This part can only be read. During reading, its contents are set to
zero. This section is often regarded as the entire register.
ENABle section
the ENABle section determines whether the associated EVENt bit contributes
to the summary bit (see below). Each bit of the EVENt section is ANDed with
the associated ENABle bit (symbol '&'). The results of all logical operations of
this section are passed on to the summary bit via an OR function (symbol '
1').
ENABle bit = 0: the associated EVENt bit does not contribute to the
summary bit.
ENABle bit = 1: if the associated EVENT bit is "1", the summary bit is
set to "1" as well.
This section can be written into and read by the user in any way. Its contents
are not changed during reading.
Summary bit
as indicated above, the summary bit is obtained from the EVENt and ENABle
section for each register. The result is then entered into a bit of the CONDition
section of the higher-order register.
The device automatically generates the summary bit for each register. Thus
an event, e.g. a PLL that has not locked, can lead to a service request
through all the hierarchy levels.
Note:
The service request enable register SRE defined in IEEE 488.2 can be taken as ENABle section of the
STB if the STB is structured according to SCPI. By analogy, the ESE can be taken as the ENABle
section of the ESR.
Содержание EM510
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