Vaisala MMT330 - Manual (Page 131)

Chapter 4 _________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 129
Testing Operation of Relays
Testing activates relays even if they are disabled.
Use the module push buttons to activate the relays. Press the REL 1 or
REL 2 button to activate the corresponding relay.
Relay is activated: LED is lit
Relay is not activated: LED is not lit
RTEST
Use the serial line command RTEST to test the operation of the relays.
RTEST [x1 x2 x3 x4]
where
x = ON/OFF
Example: Activate and then release all four relays.
>rtest on on on on
ON ON ON ON
>
>rtest off off off off
OFF OFF OFF OFF
>
Enter the command RTEST without parameters to stop testing.