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(Note) A numerical value of 1 is incrementally added for every
horizontal pixel in the range of 0 to 1023 for the case of 10bits
output and 0 to 255 for the case of 8 bits output.
(Note) The value does not start with 0 at the edge of the effective image area.
(Note) The output values of the test pattern are not affected by the values of the gain setting or offset setting of the
camera.
The default setting is OFF. This setting can be changed on the configuration menu (Operation Mode Setting Group 4) or
by way of rewriting the configuration register with serial communication commands.
(4-7) 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 it by the OSD over the image. (Temperature to be displayed in Celsius)
●
Confirm it by temperature data to be returned in response to the RS-232C 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 performance for temperature data
Temperature resolution :
0.5°
Update interval of data :
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 RS-232C communication
The temperature data to be returned in response to the “RTMP” command of RS-232C 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 (
↓
Refer to [Explanation])
Then, Tc is calculated from the following formula: Tc=Dt×0.5°C=-6×0.5°C=-3°C
