Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 69
Message Polling
In the polled (CLOSEd) mode, the FD12P sends a data message when
the host computer transmits a polling command. The message polling
mode is selected by the following command:
AMES Message_number Message_interval ↵
↵↵
↵
where
Message_number
- The valid range is 0 ... 7, refer to section Message Types on
page 63.
- Selects the corresponding message as the default polled
message. Any negative message number is converted to 0.
Message_interval
- Negative or zero interval is used to disable the automatic
sending. This is used when messages are polled.
For example, AMES 0 0 ↵ selects message 0, and cancels the
automatic sending.
The polling command format is the following:
<ENQ> FD <SP> id <SP> message_number <CR>
where
<ENQ> = ASCII character 05 hex
<SP> = ASCII character 20 hex (space)
id = Selected in the configuration
message_
number
= Optional
If only one FD12P unit in on the line and no id is set, the command
format is the following:
<ENQ> FD <CR>
When the FD12P unit number two (id = 2) is polled for message
number 3, the command format is the following:
<ENQ> FD <SP> 2 <SP> 3 <CR>
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