Operating Manual
Smart Weather Sensor
130
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
19.8.1 Basic Interface Properties
Baud rate configurable from 1200bps to 57600bps, character format 8 bits, no parity,
1 stop bit (8N1).
Unit ID equal to UMB device ID, but limited to 98. 99 is the broadcast ID
Data output on request or continuously (configurable)
Commands and messages use strictly ASCII text mode
19.8.2 Message Format for Commands and Responses
Byte
0
'*'
Start Character
1,2
'01'
Destination ID
3,4
'00'
Source ID
5 ... n
Command Data (min. 2)
n+1, n+2 <CR><LF> Termination Characters
The command data field always starts with the 2-character command identifier, optionally
followed by a parameter, starting with '='.
Currently implemented commands are
P9
single measurement XDR format
PP
start continuous measurement XDR format
PB
single measurement PWSD format
PC
start continuous measurement PWSD format
GW
option: add MWD sentence (wind data) to XDR format
MI
continuous measurement interval
J3
pressure mode (absolute air pressure / relative air pressure)
JS
pressure sensor elevation
JW
spot or average output of wind data
BR
baud rate
ID
unit ID
NH
message prefix
If the device receives an invalid command (missing start or termination character, invalid ID,
invalid structure etc.), it will not respond.
If a setting command contains an invalid parameter value, the device will not respond.
Setting commands must usually be preceded by the “Write Enable” command EW. This
command does not generate a response, and may be, different from other commands,
transmitted without message terminators (<CR><LF>). I.e. the write enable and the set
command may be concatenated without terminators between the commands.
Example:
0100EW*0100J3=1<CR><LF>
and
0100EW<CR><LF>*0100J3=1<CR><LF>
are both valid command sequences for setting the pressure mode.
Setting commands not requiring a preceding write enable are marked in the command
description.