Specifications
MFC-CB™ Operation and Maintenance Manual
©2001~2007 DH Instruments, a Fluke Company Page 74
4.4 STATUS SYSTEM
The status system includes the status reporting system which reports general MFC-CB events.
The user can select which MFC-CB events will cause a status change event. These events are then
reported to the status system (bit7 and bit3 of the status byte register), which also must be
configured for the STATus subsystem to generate the service requests described in Section 4.4.1.
There are t
wo 16 bit event registers that make up the top layer of the status subsystem.
The OPERation status register handles conditions that are normal for the MFC-CB.
The QUEStionable status register handles events that could cause measurements to be made under
questionable conditions.
4.4.1 STATUS REPORTING SYSTEM
The MFC-CB status reporting system is used to track and report system status and errors.
The status subsystem is layered under and reports to the status reporting system. It follows
the model of the IEEE STD. 488.2 and works for the COM1 and the IEEE-488 port with
slight differences. The MFC-CB can be programmed to respond to various status conditions
by asserting the SRQ of the IEEE-488 interface. The COM1 port cannot be supported in
this manner, so polling must be used.
4.4.1.1 STATUS BYTE REGISTER
The MFC-CB contains an 8 bit status byte register that reflects the general status of
the MFC-CB.
Table 10. 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 MFC-CB reply output queue, the error queue, the Standard
Event Status register the Ready Event Status register, and the STATus subsystem.
status byte register
(“
∗STB?” or ”∗SRE n”)
OPERation
Bit7 (128)
OPERation summary bit
RQS/MSS
Bit6 (64)
Standard Event Status Register
(“
∗ESR?” or “∗ESE n”)
ESB
Bit5 (32)
PON
Bit7
URQ
Bit6
CMD
Bit5
EXE
Bit4
DDE
Bit3
QYE
Bit2
RQC
Bit1
OPC
Bit0
MAV
Bit4 (16)
OUTPUT
QUEUE
N/A
Bit3 (8)
ERROR
Bit2 (4)
ERROR
QUEUE
N/A
Bit1 (2)
N/A
Bit0 (1)
Figure 6. Status Byte Register