Vaisala DMP248 Servisní příručka stáhnout pdf (Strana 142)

APPENDIX 7 ________________________________________________________________________

136 ____________________________________________________________________ U263EN-1.4

Setting and activating the outputs using an RS line

Disconnect the security lock jumper!

ALARM <cr>

ALARM n ON <cr>

where n = channel number (1 or 2)

The currently valid settings of the alarm output unit can be checked

with command ALARM:

>alarm<cr>

Ch1 RH LO OFF 0.00 0.00 %RH

Ch2 RH HI OFF 100.00 0.00 %RH

This is an example of the factory setting (both alarm outputs are in

OFF mode, i.e. not in use). The settings can be changed with

command ALARM:

>alarm 1 Td HI -20 5

Ch1 Td HI OFF -20.00 5.00 ’C

Ch2 RH HI OFF 100.00 0.00 %RH

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 (Td, ppm, RH 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.

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Vaisala DMP248 Servisní příručka Strana 142