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TECHNICAL APPENDIX
DiSEqC
TM
(DIGITAL SATELLITE EQUIPMENT CONTROL)
The DiSEqC
TM
system is used to control systems with enhanced
control facilities. DiSEqC
TM
uses a serial, bidirectional transmission
process with a master and one or more slaves. The data bits
are generated with pulse width modulation of the already
existent 22 kHz carrier and are superimposed with 600 mV
ss
of the LNB remote feeding voltage. The digital code words
are composed of 8 data bits and one additional parity bit for the
recognition of transmission errors. Multiple code words form
one DiSEqC
TM
command. Code words are entered in hex code:
Code words
Parity bit
The device can send signals based on DiSEqC
TM
1.0/1.1/1.2 but
not receive them.
COMMAND OVERVIEW FOR THE FRAMING BYTE
HEX byte Description
E0 Command from master, one-time transmission
E1 Command from master, repeating transmission
E2 Command from master, awaiting response, rst transmission
E3 Command from master, awaiting response, repeated
transmission
E4 Response from slave, “OK”, no errors detected
E5 Response from slave, command not supported by slave
E6 Response from slave, parity error detected
E7 Response from slave, command not recognised
COMMAND OVERVIEW FOR THE ADDRESS BYTE
HEX byte Description
00 All devices
10 Every LNB, matrix or SMATV
11 LNB
12 LNB with loop-through
14 Matrix (switcher)
15 Matrix (switcher) with loop-through
18 SMATV
20 Every polariser
21 Full skew with linear polarisation
22 Set polariser step-by-step
30 Every positioner
31 Polar/azimuth positioner
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