Omniscan450 messages
general
10 JSON_WRAPPER
| Type |
Name |
Description |
Units |
| char[] |
string |
Length is derived from payload_length in the header. |
|
control
1002 set_speed_of_sound
Set the speed of sound.
| Type |
Name |
Description |
Units |
| u32 |
speed_of_sound |
The speed of sound in the measurement medium. ~1,500,000 mm/s for water. |
mm/s |
2197 os_ping_params
| Type |
Name |
Description |
Units |
| u32 |
start_mm |
Start of ping range, set to 0. |
mm |
| u32 |
length_mm |
Length of the returned profile, end of range = start_mm + length_mm. |
mm |
| u32 |
msec_per_ping |
Set value to limit ping rate, normally set to 0 for best ping rate. |
msec |
| float |
reserved_1 |
Set to 0 |
|
| float |
reserved_2 |
Set to 0 |
|
| float |
pulse_len_percent |
% of total ping time for current range, 0.002 typical. |
|
| float |
filter_duration_percent |
0.0015 typical. |
|
| i16 |
gain_index |
Set to -1 for auto gain, otherwise 0-7 sets gain. |
|
| u16 |
num_results |
Number of signal data points in resulting profile (200-1200), 600 typical. |
|
| u8 |
enable |
1 or 0 to enable or disable pinging. |
|
| u8 |
reserved_3 |
Set to 0 |
|
| u8 |
reserved_4 |
Set to 0 |
|
| u8 |
reserved_5 |
Set to 0 |
|
get
2198 os_mono_profile
A profile produced from a single acoustic measurement. The data returned is an array of response strength, in dB, at even intervals across the scan region. The scan region is defined as the region between and millimeters away from the transducer. Note that the amplitude of the results are in dB. This is just to keep high dynamic range in the u16 sized data elements. Normally these are converted back to linear power or signal levels.
| Type |
Name |
Description |
Units |
| u32 |
ping_number |
sequentially assigned from 0 at power up |
|
| u32 |
start_mm |
The beginning of the scan region in mm from the transducer. |
mm |
| u32 |
length_mm |
The length of the scan region. |
mm |
| u32 |
timestamp_ms |
msec since power up at time of ping |
ms |
| u32 |
ping_hz |
Frequency of acoustic signal |
hz |
| u16 |
gain_index |
0-7 |
|
| u16 |
num_results |
length of pwr_results array |
|
| u16 |
sos_dmps |
speed of sound, decimeters/sec |
|
| u8 |
channel_number |
|
|
| u8 |
reserved |
|
|
| float |
pulse_duration_sec |
|
|
| float |
analog_gain |
|
|
| float |
max_pwr_db |
|
|
| float |
min_pwr_db |
|
|
| float |
transducer_heading_deg |
|
|
| float |
vehicle_heading_deg |
|
|
| u16[] |
pwr_results |
An array of return strength measurements taken at regular intervals across the scan region. The first element is the closest measurement to the sensor, and the last element is the farthest measurement in the scanned range. power results scaled from min_pwr_db to max_pwr_db Length is derived from payload_length in the header. |
|