NF FRA5014, Инструкция по эксплуатации

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5.5 Status System
FRA5014 5-30
5.5.2 Status byte
The status byte register’s definitions are listed in Table 5-3. Each bit in the status byte register
becomes valid when “1” is set to the corresponding bit in the service request enable register, and a
service request is issued whenever even one valid bit is set (= 1). The status byte c an be read by serial
polling or an *STB? query.
Table 5-3. Status Byte Register Definitions
Bit
Weight
Condition for setting (= 1) Condition for resetting (= 0)
OPE 7 128
When “1” is set to any valid bit in the
operation event register
When all valid bits in the operation
event register are cleared to 0
RQS/
MSS
6 64 When SRQ is sent RQS: When SRQ was canceled, such
as by serial polling
MSS: When the original summary
bits were all cleared to zero
ESB 5 32 When “1” is set to any valid bit in the
standard event status register When all valid bits in the standard
event status register are cleared to 0
MAV 4 16 When a response to query is prepared
and can be output When all responses are output and
there are no more responses left to
be output
QUE 3 8
−
Always 0 (not being used)
−
2 4
−
Always 0 (not being used)
−
1 2
−
Always 0 (not being used)
OVE 0 1 When “1” is set to any valid bit in the
overload event register When all valid bits in the overload
event register are cleared to 0
◼
Status check after a query
Usually, after a query command is issued to submit a query, a response can be correctly received
simply by receiving a response message. It is not always necessary to check the MAV bit in the
status byte.
◼
Related commands or queries
*STB?
This queries the contents of the status byte.
Bit 6 in the response is the MSS (Master Summary Status) bit.
During serial polling, bit 6 is the RQS (ReQuest Service) bit.
*SRE / *SRE?
This sets or queries the service request enable register.
Set “0” to clear the enable register to zero.
There are no other commands for clearing.
This register is cleared to zero immediately after power-on.
The parameters in setting messages or response messages for each register are values obtained by
adding the weights of all “1” bits.