Rhotheta RT-600 - Serial Interface Data Protocol (Short Description); General; Timing of Serial Data

User manual: Installation and Operation of Direction Finder System RHOTHETA RT-600 / SAR-DF 517
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6.2 Serial interface data protocol (short description)
6.2.1 General
Interface parameters: RS232: 9600 Baud, 8 databits, 1 stopbit, no parity, LSB sent first
Timing of serial data:
For accurate use of the serial data (even for the optional serial input commands) the correct timing is mandatory.
The DCU (Display Control Unit) sends out via the RS-232 Pins (see Cable Connection / Wiring, page 30) cyclic
and autonomous every approx. 250..300 ms a binary data stream, which contains all relevant DF-bearing
information.
The output data contains one or two blocks of binary data (see next picture with accordingly description). The
optional serial input is only used if changes (as example frequency change) is done by additional remote control
units.
Timing of serial data
Serial standard output:
This output data is always available and contains all relevant DF-bearing data. For detailed content
see page 37.
Optional extended serial output:
This data contains some additional information like as example CospasSarsat or LoJack decoding
and ID data. For detailed content see page 39.
The data is only available with DCU Software [Rev ≥ 3.20] and if this optional data block is
configured as ON = enabled (see Setup Page, point (10) )
Even to avoid compability problems with already existing, older remote control software, it is possible
to disable / switch off this additional data block (see Setup Page, point (10) )
Optional serial input:
Only used for optional commands to control DCU parameters. If, as example the direction finder
frequency is changed remotely, there is send to the DCU one time this data block with the new
frequency. For detailed content see page 41.