DH Instruments PPCK PLUS, Operation And Maintenance Manual

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PPCK+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc .
Page 108
4.5.2 STATUS BYTE REGISTER
The PPCK+ contains an 8 bit Status Byte Register that reflects the general status of
the PPCK+.
Table 14. 8 Bit Status Byte Register
OPER
(128)
RQS/MSS
(64)
ESB
(32)
MAV
(16)
N/A
(8)
ERROR
(4)
N/A
(2)
RSR
(1)
This register is affected by the PPCK+ reply output queue, the Error Queue, the Standard
Event Status register and the Ready Event Status register.
Status Byte Register
(“
∗
STB?” or ”
∗
SRE n”)
OPER
(128)
RQS/MSS
(64)
Standard Event Status Register
(“
∗
ESR?” or “
∗
ESE n”)
ESB
(32)
←←←
PON
(128)
URQ
(64)
CMD
(32)
EXE
(16)
DDE
(8)
QYE
(4)
RQC
(2)
OPC
(1)
MAV
(16)
←←←
OUTPUT
QUEUE
N/A
(8)
ERROR
(4)
←←←
ERROR
QUEUE
N/A
(2)
Ready Event Status Register
(“RSR?” or ” RSE n”)
RSR
(1)
←←←
N/A
(128)
N/A
(64)
N/A
(32)
N/A
(16)
N/A
(8)
MEAS
(4)
NRDY
(2)
RDY
(1)
Figure 10. Status Register Schematic
The Status Byte Register can be read using the “*STB?” query, or by performing a serial poll
on the IEEE-488 bus. If you read this using a serial poll then Bit 6 is the RQS. If the “
∗
STB?”
query is used, then bit 6 is the MSS bit. All of the other bits are common to both types
of query.