Campbell Scientific CS120A CS120A Visibility Sensor - Page 14

Supported data rates for RS232 and RS485

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CS120A Visibility Sensor RS232 output voltage high (into 4.4V - - 3K) RS485 Communications RS485 input threshold voltage -0.2V - +0.2V RS485 output (Unloaded) - - 5V RS485 output (Load 50) 2V Maximum voltage at any terminal(4) -7V - - - +7V User alarm outputs User output high level (at 85ºC) 3.8V - User output high level (at 25ºC ) 4.13V - User output low (All temperatures) 0.25V - User output current - - 0.55V 32mA (1) It is recommended that the hood heaters are run at 24V AC/DC. It's possible to run the heaters at any voltage below 24V but the heaters will generate proportionally less heat reducing their ability to prevent ice build-up. (2) Each hood takes 30W, 60W is the total for both hoods on the sensor together. (3) The ground of the CS120A and the earth of any RS485 equipment cannot be further apart than this voltage. A 100 resistor can be used to connect the CS120A RS485 earth to other equipment. This will reduce any parasitic currents and bring the two earths closer together if a direct connection cannot be made. (4) The RS232 communications interface will automatically turn itself off when not transmitting. (5) If hood heaters are not being used ensure `Hood heater override' (details in Section 13) is set to off. 4. Supported data rates for RS232 and RS485 Serial setting 8N1 Supported data rates  1200 bps  2400 bps  9600 bps  19200 bps  38400 bps - default  57600 bps  115200 bps 4

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CS120A Visibility Sensor
4
RS232 output voltage high (into
3K
)
4.4V
-
-
RS485 Communications
RS485 input threshold voltage
-0.2V
-
+0.2V
RS485 output (Unloaded)
-
-
5V
RS485 output (Load 50
)
2V
-
-
Maximum voltage at any terminal
(4)
-7V
-
+7V
User alarm outputs
User output high level (at 85ºC)
3.8V
-
-
User output high level (at 25ºC )
4.13V
-
-
User output low (All temperatures)
0.25V
-
0.55V
User output current
-
-
32mA
(1) It is recommended that the hood heaters are run
at 24V AC/DC.
It’s possible to run the heaters at
any voltage below 24V but the heaters will generate proportionally less heat reducing their ability to
prevent ice build-up.
(2) Each hood takes 30W, 60W is the total for both hoods on the sensor together.
(3) The ground of the CS120A and the earth of any RS485 equipment cannot be further apart than this
voltage.
A 100
resistor can be used to connect the CS120A RS485 earth to other equipment.
This
will reduce any parasitic currents and bring the two earths closer together if a direct connection cannot
be made.
(4) The RS232 communications interface will automatically turn itself off when not transmitting.
(5
) If hood heaters are not being used ensure `Hood heater override’ (details in Section 13) is set t
o off.
4.
Supported data rates for RS232 and RS485
Serial setting
8N1
Supported data rates
1200 bps
2400 bps
9600 bps
19200 bps
38400 bps - default
57600 bps
115200 bps