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Appendix D – DiSEqC Description
About DiSEqC
DiSEqC is an acronym for “Digital Satellite Equipment Control” and is achieved using
the 22kHz signalling tone. The 22 kHz signal is imposed on the LNB DC voltage of
13V or 18V at a level of 0.65V p-p. Normally, the 22kHz signal is either continuously
on or off. When a DiSEqC message is to be sent, if the 22kHz is on, it is turned off
for a “quiet period” before the message. Then the DiSEqC message is sent as a
series of bytes with an odd parity bit appended. The bits are formed by modulation of
the 22kHz signal as shown below.
Most DiSEqC commands are 3 bytes in length but some can be up to 6 bytes long,
so the transmission time of a DiSEqC message is on the order of 40 to 80
milliseconds.
DiSEqC Commands Supported in Satlook Lite
LNB1: 0xe0, 0x10, 0x38, 0xc0
LNB2: 0xe0, 0x10, 0x38, 0xc4
LNB3: 0xe0, 0x10, 0x38, 0xc8
LNB4: 0xe0, 0x10, 0x38, 0xcc
Positioner Commands Supported in Satlook Lite
GoEast: 0xe0, 0x31, 0x68, 0x7f
GoWest: 0xe0, 0x31, 0x69, 0x7f
Halt: 0xe0, 0x31, 0x6b
GotoX: 0xe0, 0x31, 0x6e, 0xaa, 0xbb where aa and bb are calculated from
MyLatitude, MyLongitude, and GotoX angle.
For the full DiSEqC specifications, see
http://www.eutelsat.com/satellites/4_5_5.html
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Summary of Contents for satlook Lite
Page 1: ...Satlook Lite USER MANUAL ...
