Rohde & Schwarz NRT 1080.9506.02/.62, Operating Manual

Page: 136 / 194

Status Reporting System NRT
1080.9506.02 3.56 E-6
Bit-No. Meaning
10
SERRor
This bit is set when the sensor signals an exceptional situation.
Example: The sensor is operated outside its allowed temperature range.
11 ABURst
This bit is set in the case of conflicting burst parameters (the burst period set is smaller than the burst width).
The NRT then returns measured results corresponding to the unmodulated signal.
3.7.4 Application of the Status Reporting Systems
In order to effectively use the status reporting system, the information contained there must be trans-
mitted to the controller and further processed there. There are several methods which are outlined in the
following. For detailed program examples, see Annex D, "Programming Examples".
3.7.4.1 Service Request, Making Use of the Hierarchy Structure
Under certain circumstances, the instrument can send a service request (SRQ) to the controller. Usually
this service request initiates an interrupt at the controller, to which the control program can react appro-
priately. As evident from Fig. 3-4 (Section 3.7.2), an SRQ is always initiated if one or several of bits 2, 3,
4, 5 or 7 of the status byte are set and enabled in the SRE. Each of these bits combines the information
of a further register, the error queue or the output buffer. The corresponding setting of the ENABle parts
of the status registers can achieve that arbitrary bits in an arbitrary status register initiate an SRQ. In
order use the possibilities of the service request effectively, all bits should be set to "1" in the enable
registers SRE and ESE.
Examples (cf. Fig. 3-4, Section 3.7.2 and Annex D, "Programming examples"):
Use command "
*OPC
" to generate an SRQ
½
Set bit 0 in the ESE (Operation Complete)
½
Set bit 5 in the SRE (ESB)
After its settings have been completed, the instrument generates an SRQ.
Indication of the end of a measurement by means of an SRQ with the controller
½
Set bit 7 in the SRE (sum bit of the STATus:OPERation register)
½
Set bit 4 (measuring) in the STATus:OPERation:ENABle.
½
Set bit 4 in the STATus:OPERation:NTRansition so as to make sure that the transition of measur-
ing bit 4 from 1 to 0 (end of measurement) is recorded in the EVENt part.
After a sweep has been completed, the instrument generates an SRQ.
The SRQ is the only possibility for the instrument to become active on its own. Each controller program
should set the instrument such that a service request is initiated in the case of malfunction. The pro-
gram should react appropriately to the service request. A detailed example for a service request routine
can be found in Annex D, "Programming examples".
深圳德标仪器
135-1095-0799