Sierra Video Ponderosa 3G Series Routing Switcher - Manual (Page 87)

PONDEROSA
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trailer characters and a CR character, to the host. An error can be caused by an unknown
command name or bad arguments to a command.
The simplest possible command string would be:**!! which consists of the leader and
trailer characters but no commands between them. This command string would generate
the response:
** OK !!
This can be useful for verifying that the serial link to the router is operational. In routers
requiring only one leader/trailer character, the simplest command string would be: *!
which would generate the response:
* OK !
(To determine whether a particular router uses one or two leader/trailer characters, send
it "!!**" and check the response to see which of the above two responses it is. It won’t hurt
to always use two even if only one is required.)
The simplest error response is one with no optional descriptive string. For example, this
command string:
** XXX !! might generate this response from the router:
** ERROR Syntax: No Number:XX !!
The descriptive string always ends with a colon and up to three characters from the
command string that caused the error. Generally, the error can be assumed to have
occurred just before these characters.