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525A
Users Manual
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.
Service Request
Generation
SRQ
on
IEEE bus
4-24
7
6
5
4
3
2
1
0
&
&
&
&
&
&
&
&
7
6
5
4
3
2
1
0
RQS
6
0
ESB MAV
MSS
&
&
7
5
Figure 4-5. Status Register Overview
Event Status
Available?
Register
Read using *ESR?
Event Status
Enable Register
Read using *ESE?
Write using *ESE
Read by Serial Poll
0
0
0
Status Byte Register
EAV
Read using *STB?
&
&
&
&
&
Service Request
4
3
2
1
0
Enable Register
Read using *SRE?
Write using *SRE
Data
Output Buffer
Error
Available?
Error Queue
Read using ERR?
ajr19f.eps
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