Start Measurement and Request CRC - aMC!
Same command as
aM!
but in addition to the generated data the sensor returns a 3-digit CRC checksum. For
information on how the CRC checksum is generated, please consult
‘
SDI-12 Standard, Version1.3, 2012, chapter
4.4.12’.
Syntax
Command
Answer
aMC!
a0036<CR><LF>
a
– Sensor address
a
– Sensor address
M
– Command ‘Start Measurement
003
– Seconds the sensor needs until the
and Request CRC’
measured data can be returned
C
– Request for transmission of the
(= 3 s)
CRC checksum
6
– Number of provided measured data
!
– End of command
<CR><LF>
– end of answer
Example:
Command
Answer
2MC!
20036<CR><LF>
Start Concurrent Measurement - aC!
The
Concurrent Measurement
enables the data logger to measure simultaneously with multiple
rain[e]
s on the
same bus.
The command
aC!
requests that the sensor process the returned string and to provide the available measured
data.
In contrast to standard sensors described in the SDI-12 documentation, the
RAINE-HYDRO
measures
continuously. Thus the values during continuous measuring are stored in bu
ff
er while the string is being
processed. These values are processed after the string processing. Prior to the return waiting time (3 s) the
data logger must not send further commands. After expiration of the waiting time the data can be requested
with the commands
aD0!
and
aD1!
(see
Send Data
).
The data will not be overwritten until the next
C
,
M
, or
V
command and can be read several times in the mean
time.
Syntax
Command
Answer
aC!
a00306<CR><LF>
a
– Sensor address
a
– Sensor address
C
– Command ‘Start Concurrent
003
– Seconds the sensor needs until the
Measurement
’
measured data can be returned
(= 3 s )
6
– Number of provided measured data
!
– End of command
<CR><LF>
– End of answer
Example:
Command
Answer
2C!
200306<CR><LF>
The measured data can be requested with the commands
aD0!
and
aD1!
. (see
Send Data
).
20
SDI-RAINE-HYDRO
USER MANUAL
700-SDI-RAINE-HYDRO Rev1 03 Mar 2021
Part# 21184
