Chapter 5 ________________________________________________________________ Operation 
VAISALA ______________________________________________________________________ 147 
CLOSE Command 
The line can be released to automatic data messages with the CLOSE 
command. 
Type the following: 
0> CLOSE 
The LT31 sensor with the ID 1 answers as follows: 
LT31-1 LINE CLOSED 
Available Commands 
With the HELP command the operator can get information about the 
available commands. By typing the HELP string (where string is any 
valid command), the operator can get information about a specific 
command. 
The hierarchy and description of the commands are described in Table 10 
on page 148. There is a user level command set and also a second, 
advanced, in-depth maintenance and service level command set. To 
access the advanced level, use the LEVEL 1 command. The command 
prompt shows the current command set level. For the user level it is 0> 
and for the advanced level it is 1>. 
Command Completion 
The operator only needs to remember the first few letters of the 
command and the system can automatically identify the command and its 
parameters. This can be done if the letters the user enters can 
unambiguously determine the command or parameter. 
If the command cannot be unambiguously identified, the system output is 
as follows: 
-  If the command cannot be completed to any known command the 
system answers the following: 
 
COMMAND NOT FOUND 
-  If the input entered by the user cannot be unambiguously identified as 
a command, the system outputs a list of matching commands. The 
new system prompt includes the user's previous input allowing the 
user to complete the command using the list of matching commands. 
-  If the command entered by the user is identified but the parameters are 
incomplete, unambiguous, or otherwise not possible, the system