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July 2019 – TD 304 OPERATING MANUAL – Doppler Current Profiler Sensor
5.3
Communication setup
Most terminal programs can be used for
Smart Sensor Terminal
communication with the sensor when connected to a
PC, e.g. Teraterm.
The following Smart Sensor Terminal setup should be used:
115200 Baud
8 Data bits
1 Stop bit
No Parity
Xon/Xoff Flow Control
IMPORTANT! The terminal program must send a Line Feed after each Carriage Return.
5.4
Sensor startup
When property
Enable Text
is set to
Yes
,
StartupInfo
is displayed at sensor power up or after
Reset
.
StartupInfo
contains information about
Product Number, Serial Number, Mode, Protocol Version
and
Config Version
(Refer to
After the first line it also outputs
Initializing
… to indicate that it is busy. When it is ready and has started it outputs
Started….
The initializing phase can take up to approx. 30s dependent on the configuration of the sensor.
Figure 5-2: Start up info: communication using Tera Term
In order to minimize the current drain the sensor normally enters a power down mode after each sampling; the sensor
can be awake by any characters on the Smart Sensor Terminal input, and will stay awake for a time set by the
Comm
TimeOut
property after receiving the last character.
If the property
Comm TimeOut
is set to other than
‘Always On’
the serial interface will not be activated after power-up (or the
Reset
command). Any character will activate the serial interface, but a Carriage Return (CR or CR+LF),
‘/’
or
‘;’
are often
preferred since these characters do not interfere with the command syntax. The serial interface will then be active until a
period of input inactivity specified by the
Comm TimeOut
value (10 s, 20 s, 30 s, 1 min, 2 min, 5 min,10 min). The
Communication Sleep Indicator
,
‘%’,
will be transmitted when the serial communication is deactivated, and the
Communication Ready Indicator, ‘!’
is outputted subsequent to activation (electronics require up to 500ms start up time).
When
Comm TimeOut
is set to ‘
Always On’
the communication (and microprocessor) will be kept active all time.
The
Communication Sleep Indicator ‘%’
and the
Communication Ready Indicator ‘!‘
are not followed by Carriage
Return and Line Feed.