Functional description

ST7LNB1Y0

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3.2.1

Command signalling

In order to be detected, the DiSEqC-ST commands must be sent after a voltage change

from 13 to 18 V. A delay time, t, between 4 ms and 24 ms must be respected before sending

the DiSEqC-ST commands (see Figure 8).

Figure 8.

Signalling of the DiSEqC-ST command

Table 7.

ODU_SaTCR_Inst(5Bh)

Sub-command

DATA1

DATA2

Command Description

7 6

5

4 32 10

SaTCR

0 00 01

This command is sent by an RTA-STB in order

to determine the ST7LNB1Y0 application

number.

SaTCR

This command is sent by the RTA-STB in

order to determine the L.O frequencies

present in the LNB.

ODU_SaTCRxSignalOn

xx

00

xxh

When receiving this command the

ST7LNB1Y0 commands all the SaTCRs to

send a tone in order to indicate their

respective BPF center frequencies.

1.

ODU_Config: When receiving this command the ST7LNB1Y0 checks if the Polonium indicated in data1 corresponds to the

ST7LNB1Y0 application number, if it is the case the ST7LNB1Y0 commands SaTCR indicated in data1 to send a tone

2.

AppliNum: application number [1 to FFh] (refer toTable 11).

3.

ODU_Lofreq: When receiving this command the ST7LNB1Y0 checks if the LOfreqNum indicated in data1 corresponds to

the one of the L.Os present in the application, if it is the case the ST7LNB1Y0 commands SaTCR indicated in data1 to

4.

LofreqNum: Local oscillator table entry number [1 to FFh] (refer to Table 10).

Table 8.

DiSEqC-ST command examples

LNB

DiSEqC Frame

Description

ODU_Config

E0 00 5B 01 02

The STB asks if the application number is 2, the reply tone is

ODU_Lofreq

E0 10 5B 42 04

The STB asks if the LO frequency number 4 is present on the

ODU_Change_Channel

E0 00 5A 24 55

055h from matrix RF input = Feed1.

13 V

18 V

DiSEqC-ST Frame

24 ms

≥ t ≥ 4 ms

~ 1ms