Appendix: HART Specific Information
MSA
ULTIMA X ® Series
GB
109
Command #141: Read Cal Signal Status
This command returns the ULTIMA X Cal Signal status. This is a single byte con-
taining a 0 if disabled or 1 if enabled. If enabled, the output will be set to 3.75 mA
during calibration [21 mA for oxygen]. If disabled, the output will track the gas con-
centration.
Request Data Bytes
None.
Response Data Bytes
Command #142: Read Alert Option Status
This command returns the ULTIMA X Alert Option Status status. This is a single
byte containing a 0 if disabled or 1 if enabled. If enabled, the Alert Option will cause
the 4-20 mA to be set to 3.75 mA during calibration of an Oxygen sensor [if the Cal
Signal Option is also enabled]. If the Alert Option is disabled and the Cal Signal en-
abled, the output will be set to 21 mA during Oxygen sensor calibration.
Request Data Bytes
None.
Response Data Bytes
Command #143: Read Sensor Temperature
This command returns the ULTIMA X Sensor Temperature. This is a single byte
containing an integer value representing the temperature returned by the gas sen-
sor. Not all gas sensors have an on-board temperature sensor.
Request Data Bytes
None.
Response Data Bytes
Byte
Format
Description
0
Enum
Sensor Cal Signal [0 –disabled, 1 - enabled]
Byte
Format
Description
0
Enum
Alert Option Status [0 - disabled, 1 - enabled]
Byte
Format
Description
0
Unsigned
Sensor temperature [°C]
