User manual: Installation and Operation of Direction Finder System RHOTHETA RT-600 / SAR-DF 517
- 39 -
6.2.3
Optional extended serial output (protocol description)
The data content depends on the actual mode of the direction finder. To get special data, the direction finder has
first to be switched to the equivalent mode.
COSPAS-SARSAT Decoding data
This data is only available and
valid
, if:
•
Display Control Unit with actual software Rev
≥
3.20 (see Power-On procedure, page 8)
•
Configuration of Extended serial = ON (see Setup Page, point (10) )
•
Direction Finder COSPAS-SARSAT decoding mode is activated by selecting the corresponding page
(see COSPAS-SARSAT Decode Window, page 15 and page 14) and so on Header (byte 0 of data) =
0x91
A valid COSPAS-SARSAT decoding data protocol is always marked by the first data byte (
header = 0x91
).
Always after receiving and decoding of a valid COSPAS-SARSAT puls, the complete data protocol with 33 bytes
is send out one time.
Byte No.
[0]
Header = 0x91 (Identification for CP/Sarsat decoding mode)
[1]
Number of bytes
- 7 if no decoded pulse is available
- 33 if new pulse was received and is available
[2]
Error
[3]
Bit[0]:
- 0 => No new 406 MSG (decoded data) available
- 1 => New valid 406 MSG available (Sync & Frame Ok), Check Error Status for Bit-Errors
Bit[6..1]: AutoSquelch Level
valid range: [0..60] (%, decimal)
Bit[7] = 1: Squelch controlled by AU
[4]
Signallevel of received signal
valid range: [0..99] (%, decimal)
[5]
Voltage of Antenna Unit Power Supply input
valid range: [80..255] (decimal, = 8.0 .. 25.5 V DC)
[6]
Temperature inside Antenna Unit
valid range: [-50..+100] (°C, signed byte value)
The following databytes are only available,
if a correct CP/Sarsat puls gets received and decoded with correct checksum
[7..24]
18 x Databytes complete orginal CP/Sarsat 406 decoded message (144 bit)
Databyte Nr: [ Byte 7 ] [ Byte 8 ] [Byte9 .. .. Byte24]
406 MSG Bit Nr: [1 2 3 4 5 6 7 8] [9 10 11 12 13 14 15 16] [17 .. .. 144]
[25]
S/N-Flag valid values: 0x53=’S’; 0x4E=’N’;
0x2D=’-’ if no GPS data available
[26]
Deg valid values: [0..90] (decimal, Deg)
0xFF if no GPS data available
[27]
Min valid values: [0..59] (decimal, Deg)
0xFF if no GPS data available
[28]
Sec valid values: [0..59] (decimal, Deg)
0xFF if no GPS data available
GPS-Position Latitude
[29]
W/E-Flag valid values: 0x57=’W’; 0x45=’E’;
0x2D=’-’ if no GPS data available
[30]
Deg valid values: [0..180] (decimal, Deg)
0xFF if no GPS data available
[31]
Min valid values: [0..59] (decimal, Deg)
0xFF if no GPS data available
[32]
Sec valid values: [0..59] (decimal, Deg)
0xFF if no GPS data available
GPS-Position Longitude
