6240B DC Voltage Current Source/Monitor Operation Manual
6.5 Status Register Structure
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2. Event Enable Register
Each Event Register has an Enable Register that decides which bit is to be enabled. The Enable Register
sets the relevant bit in decimal values.
•
Service Request Enable Register setting: *SRE
•
Standard Event Status Enable Register setting: *ESE
•
Device Event Enable Register setting: DSE
(Example) Enables only the EOM bit of the Device-Event Register.
When the EOM bit of the Device Event Register is set to 1, the DSB bit of the Status
Byte Register is set to 1.
(Example) Enables the Status Byte Register's DSB (Device Event Status Register summary) bit and
the ESB (Standard Event Status Register summary) bit.
When the DSB bit or the ESB bit is set to 1, the Status Byte Register's MSS bit is set to 1.
3. Status Byte Register
The Status Byte Register summarizes the information from the status registers. This Status Byte Regis-
ter's summary is transmitted as a service request to the controller. Consequently, the Status Byte Register
is slightly different from other status registers in structure. The Status Byte Register is explained in the
following:
The following figure shows the structure of the Status Byte Register.
Figure 6-2 Status Byte Register Structure
The Status Byte Register conforms to other status registers except the following three points.
•
The summary of the Status Byte Register is written into bit 6 of the Status Byte Register.
•
The Enable Register's bit 6 is always enabled and cannot be changed.
•
The Status Byte Register's bit 6 (MSS) writes RQS (request service).
This register responds to a serial poll from the controller.
When responding to the serial poll, bit 0 to 5, bit 7, and RQS of the Status Byte Register are read, after
which RQS is reset to 0. Other bits are not cleared until their factors become 0.
The Status Byte Register, RQS, and MSS can be cleared by executing "*CLS." Accompanying this, the
SRQ line also becomes False.
The following table describes each bit of the Status Byte Register.
Status Byte Register
Service Request Enable
Register
MSS
MSS
RQS
ESB
DSB
MAV
7
X
5
4
3
2
1
0
&
OR
