Intermec IV7 Basic Reader Interface Programmer's Reference Manual (BRI version - Page 135

ANTENNAS or ANTS Attribute, Sensing an Over-Temperature Condition

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Chapter 5 - Reader-Specific Platform Specifications ANTENNAS or ANTS Attribute The ANTENNA or ANTS attribute sets the antenna sequence to be used during READ and WRITE commands. For more information, see "ANTENNAS or ANTS" on page 86. For readers that contain the IM4 module, you can specify the value 1 once in this attributes command. For example: ATTRIB ANTS=1 Sensing an Over-Temperature Condition When the application requests a tag operation (such as identify, read, or write) and the temperature of the IM4 reader is within normal limits, the IM4 returns normal status and data, if found. If the temperature is out of range (approximately 70 °C or 158 °F at the RF power amplifier), the IM4 returns an over-temperature event to indicate this condition. The IM4 returns events related to the over-temperature condition in the following format: EVT:THERMAL OVERTEMP xxC EVT:THERMAL NORMAL xxC where xx is the current temperature in Celsius. While the IM4 is in an over-temperature condition: • The reader will return a NOTAG response. • Only the tag-reading functions are inhibited. All other functions are possible. • The time required for the IM4 to return to a normal temperature depends on the ability of the environment to dissipate the heat. When the IM4 returns to a normal operating temperature, it returns normal status in response to commands. Note: The IM4 has a built-in thermal-control self-protection circuit. Because many environmental variations exist, it is impossible to predict exactly when the IM4 may go into thermal-protection mode. The IM4 was designed for up to 1 Watt of continuous power at 100% duty cycle, and care has been taken to rid the IM4 of excess heat, ensuring that users rarely see this scenario. Basic Reader Interface Programmer Reference Manual 123

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Chapter 5 — Reader-Specific Platform Specifications
Basic Reader Interface Programmer Reference Manual
123
ANTENNAS or ANTS Attribute
The ANTENNA or ANTS attribute sets the antenna sequence to be used during
READ and WRITE commands. For more information, see
“ANTENNAS or ANTS”
on page 86
.
For readers that contain the IM4 module, you can specify the value 1 once in this
attributes command. For example:
ATTRIB ANTS=1<CRLF>
Sensing an Over-Temperature Condition
When the application requests a tag operation (such as identify, read, or write) and
the temperature of the IM4 reader is within normal limits, the IM4 returns normal
status and data, if found.
If the temperature is out of range (approximately 70 °C or 158 °F at the RF power
amplifier), the IM4 returns an over-temperature event to indicate this condition.
The IM4 returns events related to the over-temperature condition in the following
format:
EVT:THERMAL OVERTEMP
xx
C<CRLF>
EVT:THERMAL NORMAL
xx
C<CRLF>
where
xx
is the current temperature in Celsius.
While the IM4 is in an over-temperature condition:
•
The reader will return a NOTAG response.
•
Only the tag-reading functions are inhibited. All other functions are possible.
•
The time required for the IM4 to return to a normal temperature depends on the
ability of the environment to dissipate the heat.
When the IM4 returns to a normal operating temperature, it returns normal status
in response to commands.
Note:
The IM4 has a built-in thermal-control self-protection circuit. Because many
environmental variations exist, it is impossible to predict exactly when the IM4 may
go into thermal-protection mode. The IM4 was designed for up to 1 Watt of
continuous power at 100% duty cycle, and care has been taken to rid the IM4 of
excess heat, ensuring that users rarely see this scenario.