# ⁣⁣Other commands ## ctl command The command enables managing the unit’s built-in heater (optional). Syntax: ``` ctl [heater threshold|on|off [[no]log]] ``` * "*threshold" -* heater enable temperature ( -15...-1 ) The Astra Wireless units can be supplied with a built-in heater to enable their operation in very low temperatures and arctic conditions. Such units also has a built-in sensor for the inside temperature. “c*tl*” command executed with no additional parameters shows the current temperature inside the unit in Celsius. “c*tl heater threshold*” command sets a threshold for the temperature under which the built-in heater is turned on. The range of the threshold temperature varies between -15 and -1 degrees Celsius. For example: ``` ctl heater threshold -10 ``` “*Ctl heater on/off*” command turns on or off the heater: ``` ctl heater on ``` “*Log*” option enables registering heater operation events for the sensor in the system log. To disable logging a “*nolog*” option is used.