Wavecom W74PC V8.7.0 - Manual (Page 175)

WAVECOM Decoder W74PC, W-PCI/e, W-CODE, W-CLOUD Manual V8.7.0 Transmission Modes
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Protocol Structure
System Information
Network and system information is transmitted within the system subdivision of a batch. The system in-
formation is divided into two parts, System Information (SI) and Supplementary System Information
(SSI).
Depending on the value of the SSI flag the Supplementary System Information (SSI) carries information
on zone, local time and date. Another option displays day of week, month of year and year.
Data
ERMES transmits data in fixed-length frames of 36 bits. A frame may carry an additional data field and the
text data.
Message Frame (MHEAD)
The Variable Information Field (VIF) has two main options depending of the status bit ALL = 0 or ALL = 1.
Variable Information Field Without Supplementary Information
Variable Information Field With Supplementary Information
The ETS 300 133-4 standard has a very fine grained subdivision of the VIF and this enables ERMES to be
used for a wide range of applications.