Command filters
Digi TransPort User Guide
692
Command filters
When this feature is enabled, commands will not reach the router’s command interpreter unless
they are defined in the Command Filters table. Terminal devices may send commands that the
router will not necessarily understand but that require a basic
OK
or
ERROR
response.
With command filtering turned on, any command entered will be responded to with a MODEM-
like
OK
or
ERROR
response (depending on settings below) unless the command is found in the
Command Filters table. The command filter uses wild-card character matching so that command
filters such as
cmd*
are permitted which would allow all
cmd 0 ..
. commands to be executed.
Note that the command mapping table is checked first and the command filter table is only
checked if there was not a match in the command matching table.
For more information on command filtering, see
Application Note 17, Command Line Response
Manipulation
, which is available on the Digi web site (
www.digi.com
).
The table is generated by typing the desired command into the text box and clicking the
Add
button. Once a command has been entered into the table, it can be removed by clicking the
Delete
button that appears on the right hand side.
Command
This text box contains the command to filter.
Related CLI commands
Command filtering is enabled from the command line for any particular instance of the
command interpreter with the following command:
cmd <n> cfilton 1
The default action is to respond with the
OK
response. If the response needed is
ERROR
, use the
parameter
:
cmd <n> cfilterr 1
Where
n
is the instance number.
Note
If the command string contains blank characters, it must be enclosed by double quotation
marks. When substituting a command, upper case characters are considered the same as
the corresponding lower case characters.
Entity
Instance
Parameter
Values
Equivalent Web Parameter
cfilter
n
cmd
Valid command line
command
Command
cmd
n
cfilton
0,1
0=Off
1=On
n/a
cmd
n
cfilterr
0,1
0=Off-OK
1=On-ERROR
n/a
