STS1TX datasheet(44/70 Pages) STMICROELECTRONICS

44 / 70 page

Transmission and reception

STS1TX

44/70

DocID025109 Rev 1

9.5.2

Wireless M-Bus packet (W M-BUS, EN13757-4)

The WM-BUS packet structure is shown in the figure below (refer to EN13757 for details

about sub-mode specific radio setting).

The preamble consists of a number of chip sequences '01' whose length depends on the

chosen sub-mode according to EN13757-4. The length can be programmed using the

MBUS_PRMBL_CTRL, from a minimum to a maximum dictated from the standard

specification.

1st block, 2nd block, and optional blocks: can be defined by the user. The packet handler

engine uses the Manchester or the “3 out of 6” encoding for all the blocks according to the

defined sub-mode.

The postamble consists of a number of chip sequences '01' whose length depends on the

chosen sub-mode according to EN13757-4. The length can be programmed using the

MBUS_PSTMBL_CTRL, from a minimum to a maximum dictated from the standard

specification.

The sub-mode can be chosen setting the MBUS_SUBMODE[2:0] field of the MBUS_CTRL

•

Submode S1, S2 (long header) (MBUS_SUBMODE=0):

–

Header length = MBUS_PRMBL_CTRL + 279 (in '01' bit pairs)

–

Sync word = 0x7696 (length 18 bits)

•

Submode S1-m, S2, T2 (other to meter) (MBUS_SUBMODE =1):

–

Header length = MBUS_PRMBL_CTRL + 15 (in '01' bit pairs)

–

Sync word = 0x7696 (length 18 bits)

•

Submode T1, T2 (meter to other) (MBUS_SUBMODE =3):

–

Header length = MBUS_PRMBL_CTRL + 19 (in '01' bit pairs)

–

Sync word = 0x3D (length 10 bits)

•

Submode R2, short header (MBUS_SUBMODE =5):

–

Header length = MBUS_PRMBL_CTRL + 39 (in '01' bit pairs)

–

Sync word = 0x7696 (length 18 bits).

•

Submode N1, N2, short header:

–

Header length = 8 (in '01' bit pairs)

–

Sync word = 0xF68D (length 18 bits).

9.5.3

Basic packet

Bytes nx(01)

nx(01)

Preamble

Sync

1st block

2nd block

Opt. blocks

Postamble

Manchester or 3 out of 6 encoding

1-32

1-4

0-16 bit

0-1

0-4

0-65535

0-3

Preamble

Sync

Length

Address

Control

Payload

CRC

STS1TX 数据表(PDF) 44 Page - STMicroelectronics

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