7-50 Agilent E5250A User’s Guide, Edition 9
Command Reference
Status Byte Register
Status Byte Register The E5250A Status Byte Register contains bits (ESB and MAV) for status s ummary
messages from other registers. The status of these bits depends on the condition of
the Standard Event Status Register and the Output Queue. If service request occurs,
Bit6 (RQS) of Status Byte Register is set.
Refer to Figure 7-2 and Table 7-1 for the E5250A Status Byte Register.
Figure 7-2 Status Byte Register of E5250A
The Status Byte Register can be read with either a serial poll or the *STB? common
query command (refer to “Common Commands” on page 7-4).
Serial poll is a low-level GPIB command that can be executed by SPOLL in HP
BASIC, such as the following:
Status=SPOLL(@Hp5250)
Both serial poll and STB? read the Status Byte Register identically, but have
following difference:
•SPOLL returns RQS for bit6
• *STB? returns MSS for bit6
RQS and MSS are always the same value, so returned Status Byte value is always
the same for these two methods.