Remote Commands
R&S
®
Cable Rider ZPH
526
User Manual 1321.0950.02 ─ 07
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.
ENABle part
The ENABle part determines whether the associated EVENt bit contributes to the sum
bit (see below). Each bit of the EVENt part is ANDed with the associated ENABle bit
(symbol '&'). The results of all logical operations of this part are passed on to the sum
bit via an OR function (symbol '+').
ENABle-Bit = 0: the associated EVENt bit does not contribute to the sum bit
ENABle-Bit = 1: if the associated EVENT bit is "1", the sum bit is set to "1" as well.
This part can be written into and read by you at will. Its contents is not affected by
reading.
Sum bit
As indicated above, the sum bit is obtained from the EVENt and ENABle part for each
register. The result is then entered into a bit of the CONDition part of the higher-order
register.
The instrument automatically generates the sum bit for each register. Thus an event,
e.g. a PLL that has not locked, can lead to a service request throughout all levels of the
hierarchy.
The service request enable register SRE defined in IEEE 488.2 can be taken as
ENABle part of the STB if the STB is structured according to SCPI. By analogy, the
ESE can be taken as the ENABle part of the ESR.
14.6.12.2
Overview of the Status Register
The following figure shows the status registers used by the R&S Cable Rider ZPH.
Remote Control - Commands
