525A
Users Manual
4-24
Serial Poll Status Byte (STB)
The Calibrator sends the serial poll status byte (STB) when it responds to a serial
poll. This byte is cleared (set to 0) when the power is turned on. The STB byte is
defined as shown in Figure 4-5. Refer to the
*STB?
Command for RS-232
interface operation in Chapter 5 for more information.
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
&
&
&
&
&
&
&
&
Logical OR
Event Status
Register
Read using *ESR?
Event Status
Enable Register
Read using *ESE?
Write using *ESE
PON 0
CMEEXEDDEQYE0
OPC
0
0
0
0
1
2
3
4
5
7
&
&
&
&
&
&
&
Logical OR
Status Byte Register
Service Request
Enable Register
ESB MAV
Read using *SRE?
Write using *SRE
Error Queue
Read using ERR?
Read by Serial Poll
Read using *STB?
Service Request
Generation
SRQ
on
IEEE bus
Output Buffer
EAV
Data
Available?
Error
Available?
MSS
6
RQS
0
ajr19f.eps
Figure 4-5. Status Register Overview
Summary of Contents for 525A
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