User Manual

Remote Control

R&S

FPC

323User Manual 1178.4130.02 ─ 05

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.

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 the user 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

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. Analogous, the ESE

can be taken as the ENABle part of the ESR.

Status Reporting System