User Manual for AML Oceanographic’s Micro SVT Sensor
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5
COMMUNICATIONS
5.1
RS-232 ASCII COMMUNICATIONS
5.1.1 Standard Output Data format
The standard data format is for RS-232C ASCII based sensors. Custom data outputs and
formats are listed in appendix A. The Micro SVT Sensor can output data in Raw or Real
modes. The mode can be changed by supplying the appropriate command. Refer to
section 5.1.2 for commands.
5.1.1.1 Header Output
When a standard Micro SVT Sensor is first powered up it monitors the communications
line. If a data cable is connected the instrument will monitor the signal line for a carriage
return/line feed (i.e. the <
enter
> key) from the external computer. The instrument
automatically determines the baud rate and configures itself to match. The instrument
then responds with the header information. The header identifies the sensor type,
firmware version and serial number of the instrument.
Example header:
Micro SVT Sensor V1.0 SN:4426-SVT
Copyright 2003, AML Oceanographic
5.1.1.2 Real Output Mode
The Real mode outputs only the final calculations of date/time and sensor readings in
engineering units. The output is sent as space delimited ASCII characters in the
following format:
Date (Month/Day/Year) Time (hh:mm:ss:and hundredths of seconds), sound velocity (in
m/s), temperature (in
°
C) and a carriage return/line feed (end of scan).
Example scan:
05/14/03 14:23:06:02 1523.74 11.793
The above example reads
Date:
Month/Day/Year
Time of scan:
2:23 pm and 6.02 seconds
Sound velocity:
1523.74 m/s
Temperaure:
11.793
°
C
Note: a positive sign is not displayed for positive temperatures
.
