Lambrecht rain[e]H3, Руководство пользователя

Страница: 34 / 59

User Manual
Precipitation Sensor rain[e]H3 with Ethernet
Id-No. 00.15184.540 020
rain[e]H3 Precipitation Sensor Manual
Remark to SDI-12 “Break” signal
Since the rain[e]H3 does not have a sleeping mode it does not have to be “awakened”. This means that the
rain[e]H3 ignores the “Break“ command. Therefore all regulations associated to the “Break“ command do not
have to be considered.
10.2 RS485 Interface
In the following the available protocols of the RS485 interface are described.
SDI-12 to RS485 · WL ASCII protocol · WL ASCII protocol with checksum.
10.2.1 SDI-12 Protocol
This is exactly the same protocol with the same commands as the SDI-12 protocol via RS485 interface.
10.2.2 WL ASCII Protocol
As an alternative to the SDI-12 protocol the rain[e]H3 can also answer with a LAMBRECHT defined ASCII protocol
via the RS485 interface. It may be addressed every 10 s. It is recommended to work with 60 s intervals.
Commands in the WL ASCII protocol start with <STX> ‘Start Text’ and end with ‘Carriage Return’ <CR> and
‘Line Feed’ <LF> . Since addressing is not possible with the WL ASCII protocol, it can only be used with a single
rain[e]H3 and not in a bus.
The baud rate is 19200 Bd and has the byte frame format 8N1:
8 data bits · no parity bit (no parity) · 1 stop bit
Start Measuring <STX>m<CR><LF>
The command <STX>m<CR><LF> requests the sensor to process the returning string and to provide the
available measured data. The rain[e]H3 measures continuously. Thus measured values from the continuous
measuring get stored into a buffer while the string is being processed. These values will be processed after the
string processing.
Syntax:
Command Answer
<STX>m<CR><LF> int
min
;int
h
;int
ret_min
;int
ret_h
;am
ret
;am
tot
;s
he
;t
in
<CR><LF>
<STX>
– Start of command
int
min
– Intensity in mm/min
m
– Command ‘Start Measuring’
int
h
– Intensity in mm/h
<CR><LF>
– End of command
int
ret_min
– Average intensity since last retrieval
in mm/min
int
ret_h
– Average intensity since last retrieval
in mm/h
am
ret
– Amount since last retrieval in mm
am
tot
– Total amount since system start in mm
s
he
– Heating Status (1 = ON, 0 = OFF)
t
in
– Temperature in °C
<CR><LF>
– End of answer
Command Answer
<STX>m<CR><LF> 1.120;67.200;1.120;67.200;11.200;25.400;0;12<CR><LF>
Return Error String <STX>e<CR><LF>
For service purposes the command <STX>e<CR><LF> can be used to do a system analysis and generate an
error string.
34