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Page 46
MERCAP – INSTRUCTION MANUAL
7ML19981CM01.1
Command #41 Perform Transmitter Self Test
The Self Test for the MST9500 will commence as soon as the response from the transmitter is
complete and during this time the Primary Variable Value and thus the Primary Variable
Analog Output remains frozen at the level existing at the initiation of the test. The test
requires about 10 seconds to complete and tests if the measuring circuit operates as
expected. The status of the test and the results can be read using Command #48, Read
Additional Transmitter Status. During test the HART
TM
communication operates normally,
however if a second Command #41 is send during the test a 'Transmitter Specific Command
Error' is returned.
Command #44 Write Primary Variable Units
The Primary Variable Units accepted by this transmitter is only pF (pico Farads).
Command #48 Read Additional Transmitter Status
This command returns the results of the Transmitter Self Test along with other transmitter
information.
Byte #0
Byte #0
Byte #0
Byte #0
Events (May be gone, but sent at least once)
Events (May be gone, but sent at least once)
Events (May be gone, but sent at least once)
Events (May be gone, but sent at least once)
Bit #0
EEROM write error
Bit #1
Floating point Math error
Bit #2
Undefined
Bit #3
Undefined
Bit #4
Undefined
Bit #5
WatchDog Reset occurred
Bit #6
Local (manual) test active
Bit #7
Proprietary commands enabled
Byte #1
Byte #1
Byte #1
Byte #1
Status (will be sent as long as status exists)
Status (will be sent as long as status exists)
Status (will be sent as long as status exists)
Status (will be sent as long as status exists)
Bit #0
Undefined
Bit #1
Undefined
Bit #2
Undefined
Bit #3
DAC output drive failure
Bit #4*
Measuring circuit failure
Bit #5*
ROM/EEROM checksum error
Bit #6
Test active (manual or cmd #48 started)
Bit #7
Test Fail (manual or cmd #48 started)
(*) causes Device Malfunction to be set.
Byte #2,3,4,5, 14 thru 24 are undefined.