8.1 Factory settings
Table 8-1: Factory Settings
Parameter
Setting
SDI-12 Address
0
RS-232 Data Bits
8
RS-232 Stop Bits
1
RS-232 Parity
None
RS-232 Baud Rate
9600
Pressure Units
hPa
Temperature Units
Celsius
8.2 SDI-12 commands
The BaroVUE 10 supports the commands listed in
(p. 17). When using an
M!
command,
the data logger waits for the time specified by the sensor, sends the
D!
command, pauses its
operation, and waits until either it receives the data from the sensor or the sensor timeout
expires. If the data logger receives no response, it will send the command a total of three times,
with three retries for each attempt, or until a response is received.
A
C!
command follows the same pattern as an
M!
command with the exception that it does not
require the data logger to pause its operation until the values are ready. Rather, the data logger
picks up the data with the
D!
command on the next pass through the program. Another
measurement request is then sent so that data is ready on the next scan.
As measurement data is transferred between the BaroVUE 10 and data logger digitally, there are
no offset errors incurred with increasing cable length as seen with analog sensors. However, with
increasing cable length, there is still a point when digital communications break down, resulting
in either no response or excessive SDI-12 retries and incorrect data due to noise problems. (Using
SDI-12 commands like
MC!
, which adds a cyclic redundancy check (CRC), can significantly
improve incorrect data issues.)
BaroVUE™10 Digital Barometer
16
