Chapter 4 _________________________________________________________________ Operation 
 
VAISALA ________________________________________________________________________ 97 
Available Commands 
With the HELP command the operator can get information about the 
available commands. By typing HELP command the operator can get 
information about a specific command. 
The hierarchy and description of the commands are described in Table 13 
below and Table 14 on page 98. 
Table 13  LM21 User Level Commands 
Releases the port for message transmission. 
Enables input character echo (default). 
Disables input character echo. 
If the message number is not specified, LM21 
displays the default message without transmission 
Lists available commands. With a command name 
as a parameter, the HELP command shows 
information about that specific command. 
Prints the status message. 
Prints the configuration parameters. 
SET MESSAGE TYPE message_number 
Selects the transmitted message type. 
SET MESSAGE INTERVAL number 
Sets the interval in seconds for message sending. 
Zero disables the automatic sending. 
Message is directed to the Data port (default). 
SET MESSAGE PORT MAINTENANCE 
Message is directed to the Maintenance port. 
Sets unit identifier: an alphanumerical character for 
message and polling identification. A '-' character 
removes the ID. By default no ID is set and space 
character is used in the message headings. 
Sets name: an alphanumerical string that can be 
used during installation to identify, for example, unit 
location. The maximum string length is 12 
SET MAINTENANCE_PORT BAUD number 
Sets the Maintenance port serial line baud rate to 
300...9600. Communication parameters: 8N1 (fixed). 
Resets the measurement sequence. The following 
data message is measured from the moment all 
average values are erased. Next message is 
transmitted in (interval +2) seconds. 
Sets the command mode timeout in minutes 0 to 30, 
0 disables the timeout, default is 10 min. 
SET TERMINAL_LINES number 
Adjusts printouts for used terminal screen. Minimum 
is 5 lines, default 24. 
Displays the device name given by the user, the 
device type, and ID. 
Lists the software version. 
SET DATA_PORT BAUD number yes/no 
Sets data port serial line baud rate to 300...19200. 
Verification yes/no asked only if the command is 
given via DATA PORT (default 9600).