8 Placing into operation
The wind direction transmitter is to be connected to a voltage source and a RS485 interface, as
given in the connection diagram. With the connection of the supply voltage, and after a delay of 5
sec, the output of serial data starts automatically with the following setting:
Setting of interface:
Baud rate
9600 baud
Data bits
8 bit
Parity bit
no
Stop bit
1
9 Serial Communication
For communication purpose the wind transmitter has a command interpreter. By means of this in-
terpreter the behavior of the instrument can be changed. Thus, for example, the baud rate the in-
strument ID, and the starting behavior can be adapted to the own requirements. On principle, the
command has the following construction:
AABB<CR> or AABBCCCCC<CR>
with:
AA:
Wind transmitter – ID. Is always two-digit and in the range 00… 98
ID-works setting: 00
BB:
the command, see list of commands
CCCCC:
A five-digit value for setting a new parameter value.
<CR>:
Means here carriage-return (enter-button). This sign terminates the entering of
commands.
A check of the command syntax is carried out in the wind transmitter. The correct reception of a
command is acknowledged with „echo telegram“ for ex.:
00BR00005<CR>
transmitting command
!00BR00005<CR>
echo telegram
If a command is transmitted to the instrument without parameter value, it serves for querying the
value currently set. For example, by means of the command
00BR<CR>
the current baud rate is queried. The reply telegram, for ex., appears as follows:
!00BR00005<CR>
00005
= 9600baud (see table of baud rates)
In order to avoid an unmeant parameter adjustment some commands (see list of commands) are
secured by a so-called “key”. This “key” must be transmitted before the actual modification com-
mand.
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