ST7LNB1Y0

Functional description

11/36

Figure 7.

SaTCR control and legacy (wide RF band)

3.2

DiSEqC-ST commands

To control SaTCR based LNBs and switchers, two new DiSEqC commands are used:

●

ODU_SatCR_Op (5Ah): this command is used during LNB or switcher normal

operation.

●

ODU_SatCR_Inst (5Bh): this command is used only during the LNB or switcher

installation.

Both commands frames must have the following DiSEqC format:

Different subcommands are defined, depending on the data bytes which are sent (refer to

Table 6 and Table 7).

ST7LNB1Y0

Matrix

DiSEqC 1.0

DRX1

DiSEqC-ST

DRX2

Legacy SaTCR

Table 5.

DiSEqC-ST command format

DiSEqC

Slave address

5Ah /5Bh

DATA1

DATA2

1.

All commands accept E0h or E2h framing. Whatever the command, if E2h framing is used, then the MCU sends at least

the response E4h (refer to Section 4.2).

Table 6.

ODU_SaTCR_Op (5Ah)

Sub-command

DATA1

DATA2

Command Description

76

5

4:2

1

0

ODU_ChangeChannel

Tun[8]

Tun[7:0]

This command is used for the

channel selection.

ODU_PowerOff

SaTCR

0

00h

This command is used to put a

SaTCR in low power mode.

1.

SaTCR: SaTCR number [0 to 7] (refer to Table 3).

2.

Feed: matrix RF input [0 to 7] (refer to Table 9).

3.

Tun[9:0]: tuning word.