Asterion DC Multioutput Series
Programming Manual
10-62
M330517-01 Rev C
10.2.3
SCPI Status Byte
The SCPI Status Byte registers the status of the instrument, in one of seven bits
described in Table 4-1. Read the SCPI Status Byte status register by issuing either the
*STB? command or a serial poll. Clear the Status Byte status register by issuing the
*CLS command.
NOTE:
Serial poll is applicable only to GPIB interface.
The Power Supply can be configured to request service from any of the communication
interfaces, by setting the appropriate bits in the Service Request Enable Register (SRE),
which has the same bit pattern as the status byte. Service Request Enable Register
(SRE) can be modified by issuing the *SRE <mask> command. Service Request Enable
Register (SRE) can be read by issuing *SRE? query command. See Figure 10-3.
For example, if the SRE register is set to 0x02 (Protection Event Flag), when the Power
Supply has a fault event, Status Byte register will contain 0x42 (RQS and Protection
Event Flag) and the SRQ (SRQ is supported only on GPIB) line will be asserted to
indicate a request for service. See Figure 10-3 and Section 14 SCPI Status
Implementation for further information.
Bit
Hex Value Description
0
0x01
Not used.
1
0x02
Protection Event Status flag. Indicates the selected protection
event occurred.
2
0x04
Error/event queue message available. Set when any
error/event is entered in the System Error Queue. It is read
using the SYSTem:ERRor? query.
3
0x08
Questionable Status flag. Indicates the quality of the current
data being acquired. This bit is not used.
4
0x10
Message available (MAV). Indicates a message is available to
read (Only applicable to GPIB Interface).
5
0x20
Standard Event Status Register (ESR). Summary bit for the
ESR. Set when any of the ESR bits are set and cleared when
the ESR is read.
6
0x40
Request Service flag (RQS) for serial polling or Summary Status
(SS) in response to *STB? If service requests are enabled (with
the *SRE command), this bit represents the RQS and will be
sent in response to a serial poll, then cleared. The SS bit
indicates that the device has at least one reason to request
service. Even though the device sends the SS bit in response to
a status query (*STB?), it is not sent in response to a serial poll.
It is not considered part of the IEEE-488.1 Status Byte.
7
0x80
Operation Status flag. Indicates the current operational state of
the unit. This bit is not used.
Table 10-3: SCPI Status Byte
Summary of Contents for Sorensen Asterion DC ASM
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