Setting relay trigger points – Vaisala GMT220 User Manual
Page 21
Chapter 4 _______________________________________________________Serial Communication
VAISALA _______________________________________________________________________ 21
Setting Relay Trigger Points
The relays of the transmitter turn
ON
/
OFF
when the CO
2
content reaches
the predefined trigger point. For the
ON
/
OFF
There are two trigger points for both relays. The higher limit
activates the relay and the lower deactivates it. The two limits are used to
prevent the relay switching back and forth when the measured value is
very close to set point.
Both commands can also be entered without entering a trigger point
value. The command without parameters gives the current set value.
MF_Rx_HIGH yyy
where:
x = 1 or 2 (number of the relay)
yyy = trigger point (CO
2
content in ppm)
Example of setting the higher trigger limit of the relay 1:
>MF_R1_HIGH 1200
MF_R1_HIGH=1200.0000
>
Save the settings:
MAIN_SAVE F
Give the lower trigger limit:
MF_Rx_LOW yyy
where:
x= 1 or 2 (number of the relay)
yyy = trigger point (CO
2
content in ppm)
Example of setting the lower trigger limit of the relay 1:
>MF_R1_Low 900
MF_R1_LOW=900.000000
>
Save the settings:
MAIN_SAVE F