Technology :: DiSEqC :: DiSEqC for Technicians

[7.0] Example of a DiSEqC Data Transfer

The satellite receiver would like to question the connected multiswitch about its switch settings.
The frame byte of the master is called E2, the address of the multiswitch is 14 and the command to request the switch settings is also 14. The DiSEqC data is therefore E2 14 14.
The bit flow, converted into single bits and containing the parity bits, looks as follows:
1 1 1 0. 0 0 1 0.(1) 0 0 0 1. 0 1 0 0.(1) 0 0 0 1. 0 1 0 0.(1)
The resulting PWK bursts look like this:
The slave answers as follows:
The answer converted in bits is:
1 1 1 0. 0 1 0 0.(1) 0 1 1 0. 0 1 1 1.(0)
The parity bits of the answer are tested and found valid.
The hexadecimal answer is E4 67.
The slave confirms with E4 the validity of the request.
The committed switches byte is analyzed (see 5.0):
- "Polarization", "Band" and "Position" are selectable
- "Option" is fixed (nonselectable)
- Current selection is "horizontal polarization," "low-band", "satellite system B"
- "Option" is (fixed) at A

Page 17 / 29