MAX12005 datasheet(11/14 Pages) MAXIM

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Satellite IF Switch

Table 2. DiSEqC Slave Control Interface Command Bytes

HEX VALUE

COMMAND

FUNCTION

DATA BYTES

SLAVE REPLY

0x00

Reset

Reset DiSEqC decoder

—

Framing byte

0x01

Clr Reset

Clear reset flag

Clears Status_reg, bit 0

—

Framing byte

0x04

Set Contend

Set contention flag

Sets Status_reg, bit 7

—

Framing byte

0x05

Contend

Return address only if contention flag is set

Reads Address_reg

—

Framing + data

byte

0x06

Clr Contend

Clear contention flag

Clears Status_reg, bit 7

—

Framing byte

0x07

Address

Return address unless contention flag is set

Reads Address_reg

—

Framing + data

byte

0x08

Move C

Change address only if contention flag is set

Writes to Address_reg

1 byte

Framing byte

0x09

Move

Change address unless contention flag is set

Writes to Address_reg

1 byte

Framing byte

0x10

Status

Read status register flags

Reads Status_reg

—

Framing + data

byte

0x11

Config

Read configuration flags

Reads Configuration_reg

—

Framing + data

byte

0x14

Switch 0

Read switching state flags

Reads Switch_reg

—

Framing + data

byte

0x20

Set Lo

Select the low local oscillator frequency

Clears Switch_reg, bit 4

—

Framing byte

0x21

Set VR

Select vertical polarization (or right circular)

Clears Switch_reg, bit 5

—

Framing byte

0x22

Set Pos A

Select satellite position A (or position C)

Clears Switch_reg, bit 6

—

Framing byte

0x23

Set S0A

Select switch option A (i.e. positions A/B)

Clears Switch_reg, bit 7

—

Framing byte

0x24

Set Hi

Select the high local oscillator frequency

Sets Switch_reg, bit 4

—

Framing byte

0x25

Set HL

Select horizontal polarization (or left circular)

Sets Switch_reg, bit 5

—

Framing byte

0x26

Set Pos B

Select satellite position B (or position D)

Sets Switch_reg, bit 6

—

Framing byte

0x27

Set S0B

Select switch option B (i.e. positions C/D)

Sets Switch_reg, bit 7

—

Framing byte

0x30

Sleep

Ignore all bus commands except Awake

Sets Status_reg, bit 1

—

Framing byte

0x31

Awake

Respond to future bus commands normally

Clears Status_reg, bit 1

—

Framing byte

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