Remote Commands
R&S
®
ZNH
309
User Manual 1334.5985.02 ─ 02
Table 12-6: Meaning of the bits used in the Status Byte
Bit No.
Meaning
0 to 1
Not used
2
Error Queue not empty
The bit is set when an entry is made in the error queue.
If this bit is enabled by the SRE, each entry of the error queue generates a service request.
Thus an error can be recognized and specified in greater detail by polling the error queue. The
poll provides an informative error message. This procedure is to be recommended since it con-
siderably reduces the problems involved with remote control.
3
QUEStionable status sum bit
The bit is set if an EVENt bit is set in the QUEStionable: status register and the associated
ENABle bit are set to 1.
A set bit indicates a questionable instrument status, which can be specified in greater detail by
polling the QUEStionable status register.
4
MAV bit (message available)
The bit is set if a message is available in the output buffer which can be read.
This bit can be used to enable data to be automatically read from the instrument to the control-
ler.
5
ESB bit
Sum bit of the event status register. It is set if one of the bits in the event status register is set
and enabled in the event status enable register.
Setting of this bit indicates a serious error which can be specified in greater detail by polling the
event status register.
6
MSS bit (master status summary bit)
The bit is set if the instrument triggers a service request. This is the case if one of the other bits
of this register is set together with its mask bit in the service request enable register SRE.
7
OPERation status register sum bit
The bit is set if an EVENt bit is set in the OPERation status register and the associated ENABle
bit is set to 1.
A set bit indicates that the instrument is just performing an action. The type of action can be
determined by polling the OPERation status register.
12.6.9.4
Event Status Register (ESR) and Event Status Enable Register (ESE)
The ESR is defined in IEEE 488.2. It can be compared with the EVENt part of an SCPI
register. The event status register can be read out using command
*ESR?
.
The ESE is the associated ENABle part. It can be set using the command
*ESE
and
read using the command
*ESE?
.
Table 12-7: Meaning of the bits in the event status register
Bit No.
Meaning
0
Operation Complete
This bit is set on receipt of the command *OPC exactly when all previous commands have been
executed.
1
Not used
Remote Control - Commands
