Chapter 4 _________________________________________________________________ Operation 
 
VAISALA ________________________________________________________________________ 79 
Message Formats 
In the command mode (entered with the command OPEN), the FS11P 
messages can be displayed by the MESSAGE command. In the 
independent mode (entered with the command CLOSE), the FS11P 
sensor can be polled or it can send predefined messages automatically at 
selected intervals. There are nine message formats to select from. By 
default the FS11P sensor adds frame strings to all polled and FS11P 
specific automatic messages. The polling request can ask for the 
automatic (default) or some other message (with a message number). 
When used as a part of an RVR system, the FS11P sensor can emulate 
the messages of Vaisala MITRAS Transmissometer (Single or Double 
Baseline), FD12 Visibility Meter and FD12P Weather Detector. Refer to 
sections FD12 Emulation on page 89 and MITRAS Emulation on page 
91 to see what message types can be emulated. The FS11P sensor also 
accepts MITRAS and FD12 type polling by the RVR computer when the 
emulation is on. 
MESSAGE Command 
The MESSAGE command is used for displaying messages. The 
command format for the MESSAGE command is 
MESSAGE Message_number 
If the message number is not specified, FS11P displays a default 
message. The default message is the message that has been selected for 
automatic or polled mode with the command SET MESSAGE TYPE. 
NOTE 
When displaying a message with the 
MESSAGE command, the 
message frames are not displayed.
 
 
All message frames end with 
 which represent the carriage return and 
line feed characters. This character is also used as a line separator in 
multi-line messages. 
The contents of the messages are described in the following sections.