Vaisala HMP228 - Manual (Page 110)

HMP228
Appendix 7: Alarm output unit
M210282en-A
104
When giving this command, first enter the channel number i.e. the number of
the alarm output you wish to use (1 or 2). Then select the quantity you wish to
have on that channel (aw or T). The third parameter (HI/LO) determines
whether the alarm is activated when the setpoint value is exceeded (HI) or not
reached (LO). The fourth parameter is the actual setpoint value which
activates the alarm. The last parameter is the hysteresis value; it indicates how
much the measured value has to exceed or go below the setpoint before the
alarm is deactivated. If the third parameter is HI, the alarm is deactivated
when the measured value goes below the setpoint with the chosen hysteresis
value; if the parameter is LO, the alarm is deactivated when the measured
value exceeds the setpoint with the chosen hysteresis value.
When the alarm outputs have been set, you can activate the outputs with
commands ALARM 1 ON (channel 1) or ALARM 2 ON (channel 2). Note that
you can also activate the outputs when giving other parameters with command
ALARM.
Examples of activating the outputs:
with command ALARM:
>alarm 2 T HI 25 5 ON
Ch2 T HI ON 25.000 5.00 'C
>
with commands ALARM 1 ON and ALARM 2 ON:
>alarm 1 ON
Ch1 aw HI ON 0.900 0.100 'C
>
>alarm
2 ON
Ch2 T HI ON 25.000 5.000 'C
>