Dtm-3237B Protocol Handler Source Code; Theory Of Operation; List Of Abbreviations - DekTec DTM-3237B User Manual

DTM-3237B – DVB-S2X Receiver with DVB-ASI Output
User Manual
2. I 2 C or USB Control from an Embedded Controller. If the DTM-3237B serves as a co-processor
board for satellite reception within a larger system, control can be exerted through the on-board
I 2 C or USB interface. In this case I
but USB interface can also be used. The I
Dtm3237BUtil tool via USB (mechanism 1). The factory-default I
3. Stand-Alone Operation. For situations that don't require dynamic adjustments, the DTM-3237B
can operate in a pre-configured, stand-alone mode.
Two control tools are available:
1. Dtm3237BUtil. A Windows GUI-based utility that allows you to view the DTM-3237B's status
and adjust settings. This tool can also be used for firmware updates and is ideal for initial setup
and experimental use.
2. DtmCmd. A command-line utility designed to send commands to the DTM-3237B. It is useful
for studying the low-level commands available for the DTM-3237B. Multiple DtmCmd command
lines can be combined in a script to apply a group of settings in one go.

1.5 DTM-3237B Protocol Handler Source Code

For developers interested in building custom applications to control the DTM-3237B, a complimentary
open-source protocol handler designed for DTM-32XX series devices is available. It can be
www.dektec.com
downloaded from
DtmHandler.c
of two source files,
your C or C++ application. Detailed instructions for incorporating the protocol handler into your
project are provided in the
Note:
• The command-line control tool DtmCmd is an example of an application that uses the DTM
handler. The source of DtmCmd is also available on the DekTec website. Please refer to
Appendix C for more information about DtmCmd.

1.6 Theory of Operation

Essentially, the DTM-3237B consists of two subsystems:
• A tuner, demodulator and stream processor, converting the modulated DVB-S2X input signal to
a Transport Stream on DVB-ASI;
• A processor subsystem that handles all internal/external control (USB, I

1.7 List of Abbreviations

ACM Adaptive coding and modulation
APSK Amplitude and phase-shift keying
ASI Asynchronous serial interface. Shorthand for DVB-ASI.
BCH Cyclic error-correcting codes, abbreviation comprises the initials of its
inventors names (inner FEC coding used for DVB-S2)
BER Bit error rate
CCM Constant coding and modulation
2 C control port is a plausible choice for the control interface,
free of charge and is royalty-free for use. The handler consists
and DtmHandler.h, which can be compiled and linked into
DtmHandler.h
file.
2 C address can be pre-configured using the
2
C address is 0x60.
6
2
C).