ADLINK ND-6067 - Manual (Page 244)

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6.8.7 Host is OK
@Description
When host watchdog timer is enable, host computer must
send this command to every module before timeout otherwise
“host watchdog timer enable” module‘s output value will go
to safety state output value.
Timeout value and safety state output value is defined in 3.14.
“Set Host Watchdog Timer & Safety Value”.
@Syntax
~**<CR>
~ Command leading code.
** Host is OK.
@Response
Note : Host is OK command has NO response.
@Example
User command: ~**<CR>
(602x,605x,606x,
6080,6531)