Alpha Technologies XP-EDH4 - Technical Manual - Manual (Page 41)

41 745-419-B0-001 Rev. A (11/2013)
3.0 Configuration and Operation, continued
3.6 Mat Heater MIB Configuration
The above MIB points are used to configure and enable the mat heater feature itself. By default,
the feature is disabled. The following steps detail what is necessary to configure and enable the
mat heater feature:
1. Configuring the Temperature Setpoint – This is the temperature the transponder will use to determine
if the mat heater needs to be turned on or off. By default, the temperature setpoint is 0° C. The
allowable range is -30° C to 5° C. Perform an SNMP set to MIB object matHeaterTemp.0 to set
accordingly.
2. Configuring the Time Interval – This is the interval at which the transponder will check the battery
sensor temperature against the value of matHeaterTemp.0 when the heater is on. When the heater
is off, the transponder checks the battery sensor temperature against the value of matHeaterTemp.0
every minute. This 1 minute interval is not configurable. By default, the configurable time interval is 1
minute. The allowable range is 1 – 60 minutes. Perform an SNMP set to MIB object matHeaterTime.0
to configure.
3. Configuring the Control OID index – The design of the CNTL connector is such that the transponder
firmware has no prior knowledge of what is connected to the connector as well as which pins are
connected. Therefore, the mat heater feature needs to be told which pin is to be utilized to control
the mat heater hardware. By default, this is set to 0 (unknown). Perform an SNMP set to MIB object
matHeaterControlOIDIndex.0. The value is to be 3. Important: This set to a value of 3 must be
performed prior to Step 4.
4. Enabling the mat heater Feature – The mat heater feature is ready to be enabled. By default it is
disabled. Perform an SNMP set to MIB object matHeaterSupport.0. The value is to be 2.
Mat heater MIB Configuration
matHeaterTemp 1.3.6.1.4.1.2082.5.8.1.1.1.0
Mat heater temperature setpoint in degrees C. If matHeaterSupport is set to 2 (enable), the
transponder shall compare this setpoint with the temperature reading from the HMS027 MIB point
psTemperature (lowest addressed temperature sensor of the lowest addressed power supply).
If the temperature reading falls below this setpoint, the transponder will turn the mat heater on.
Otherwise the mat heater is turned off. Item is stored in non-volatile memory and its default value
is 0 degrees C.
matHeaterTime 1.3.6.1.4.1.2082.5.8.1.1.2.0
Mat heater compare time in minutes. While the mat heater is actually on, the transponder
will compare matHeaterTemp with the temperature reading from the HMS027 MIB point
psTemperature (lowest addressed temperature sensor of the lowest addressed power supply) at
the time interval defined by this object. The result of this comparison shall determine if the mat
heater remains on or is turned off. Item is stored in nonvolatile memory and its default value is 1
minute.
matHeaterControlOIDIndex 1.3.6.1.4.1.2082.5.8.1.1.3.0
This object reports the index of the genericDigitalOutputTable from the TLGDGenericIO mib. The
physical digital out associated with that OID is what actually controls the on/off function of the mat
heater. Therefore, that OID can be used as a manual override [given that matHeaterSupport is
set to 2 (enable)]. Item is stored in non-volatile memory and its default value is 0. Note: The index
must be set to 3 to use the CNTL connector.
matHeaterSupport 1.3.6.1.4.1.2082.5.8.1.1.4.0
Controls whether the mat heater feature behavior (as defined by matHeaterTemp,
matHeaterTime, and matHeaterControlOIDIndex), is active or not within the transponder. Note:
This object is not a manual override. For instance, if this object is set to 2 (enable), the mat
heater will only come on if psTemperature is less than matHeaterTemp. For manual override
capabilities, see description for matHeaterControlOIDIndex. Item is stored in non-volatile memory
and its default value is 1 (disable). Note: matHeaterControlOIDIndex MUST be set accordingly
prior to setting this object to 2 (enable). If matHeaterControlOIDIndex is not set to a value other
than its default value, a BADVALUE error is returned.
Table 3-3, Mat Heater MIB Config Data