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(4-5) Monitoring function for internal temperature of camera
This camera is equipped with an internal temperature sensor to monitor the temperature inside the body. This function
makes it possible to use the camera in a safer way even in a harsh environment in terms of temperature, for example use
in the open air. With the use of serial communication commands, this function also works to control the forced air-cooling
fan of the camera and peripheral devices and others.
●How to monitor internal temperature of camera
The following two methods are available for monitoring the internal temperature of the camera:
●Turn on the MENU display and confirm on the OSD over the image. (Temperature to be displayed in Celsius)
●Confirm with temperature data to be returned in response to the serial communication command (”RTMP”
command). (Numerical conversion required separately)
(Note) Carefully note that the temperature data obtained by this monitoring function is not for the ambient temperature but
the internal temperature of the camera. As a general rule, the internal temperature of the camera is higher than the
ambient temperature because of the heat generation associated with the consumed electric power inside the
camera.
Even when the temperature monitored by this function exceeds the value of the “Operation ambient temperature”
shown in the specifications of the camera, no operational trouble will be caused as long as the ambient
temperature is equal to the one of the specifications or lower, and sufficient countermeasures against temperature
are taken.
●Detection capability for temperature data
Minimum unit for temperature data : 0.5°
Data refreshing cycle : 0.4 sec.
Temperature detection accuracy: ±2°C (-40°C to +85° C), +3 to -2°C (55°C to 125°C)
Effective data range : -55°C to 125°C (as long as t he operation ambient temperature of the camera is
within the range defined by the specifications.)
●Temperature data by serial communication
The temperature data to be returned in response to the “RTMP” command of serial communication is generated in the
following format:
[Data format]
The lower 10 bits out of the 16 bits of the returned data are valid.
XXXXXD9D8…D0 (invalid upper 6 bits/valid lower 10 bits as the data)
Db=B’D9D8…D0 in the binary system shows a signed integer value in two’s complement form.
However, the effective range of the temperature data is limited to the following due to the operational restriction of the
temperature sensor:
Effective range of temperature data: -110 (-55°C) to +250 (125°C)
(Note) The accuracy of the values of the temperature data is not guaranteed when the operation ambient temperature is
not within the range defined by the specifications.
[Conversion method from returned data to temperature in Celsius]
The temperature in Celsius is computed as Tc from the following formula where Dt is the signed integer number converted
from the above described 10 bit binary value of “Db=B’D9D8…D0”:
Internal temperature of camera: Tc=Dt×0.5°C
(Example 1) Where Td, the returned value of the temperature data, is “H’0032” in the hexadecimal system, it is
expressed in the binary system as follows:
Td=H’0032=B’0000.0000.0011.0010
∴Db=B’00.0011.0010 =+50 (Only upper 10 digits of Td are valid.)
Then, Tc is calculated from the following formula: Tc=+50×0.5°C=+25°C
(Example 2) Where Td, the returned value of the temperature data, is “H’03FA” in the hexadecimal system, it is
expressed in the binary system as follows:
Td=H’03F1=B’0000.0011.1111.1010
∴Db=B’11.1111.1010 (Only upper 10 digits of Td are valid.) →Dt=-6
Then, Tc is calculated from the following formula: Tc=Dt×0.5°C=-6×0.5°C=-3°C
