4. REMOTE OPERATION
Page 129
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4.4
STATUS SYSTEM
The status system includes the status reporting system which reports general molbox RFM events. The
user can select which molbox RFM 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 two 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 molbox RFM. The QUEStionable status register
handles events that could cause measurements to be made under questionable conditions.
Other registers layered below these two registers provide the structure necessary to handle the two RPT
channels and to enable the events and event transitions. Bit15 of all of these registers is not used
because Bit15 represents a sign bit on some computer systems.
4.4.1
STATUS REPORTING SYSTEM
The molbox RFM 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 molbox RFM 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 molbox RFM contains an 8 bit status byte register that reflects the general
status of the molbox RFM.
Table 23.
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 molbox RFM reply output queue, the error queue,
the Standard Event Status register the Ready Event Status register, and the
STATus subsystem.
