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36
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Device status data
The device status data is available in the addressable mode (not in talk only mode).
The device status data of the PM2528 is represented in one status (8 bits) word.
The status word is built-up as follows:
DIO8
DIO7
| DIOS
DIOS
D104
DIO3
| DIO2
DIO1
EX
ROS
|
AL
BSY
EF3
EF2
| €F1
EFO
EX
— Extension
EX
=0
Bits EF3 — EFO contain the normal function code
EX
=1
Bits EF3 — EFO contain the extended function code (Relative reference mode)
1f the AL
is 1 then bits EF3 — EFO contain the error codes,
ROS
—
Request for service, interface status bit
RaS=1
PM2528 asks for service in case of:
Programming errors
— illegal digit (out of range)
PM2528 warnings
— exceeding the crest factor
— overload
— exceeding the crest factor and overload
|f programmed via the 1EC-BUS interface
— when data is available
RQS=0
PM2528 asks no service
AL
— Alarm bit
AL=1
The PM2528 is in an erroneous or alarm condition. The condition is specified in the
bits EF3 — EFO.
AL=0
No erroneous or alarm condition.
Bits EF3 — EFO contain the function code.
The function code is extended if EXT is 1.
BSY
—
Busy bit
Busy =1
The PM2528 is measuring
Busy = 0
The PM2528 is not measuring
EF3 — EFO
Error codes if the alarm bit AL is 1.
Programming error
— illegal digit
1
— overload
PM2528 warnings
~ crest factor exceed
7
— overload and crest factor
exceed
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