Westermo AD-01 - Manual (Page 14)

14 6612-2202
Protocol implementation
Parts of the M-Bus protocol is implemented in the unit. Data packets which are not
addressed to the unit are transparently passed further without format or checksum
control. Packets addressed to the unit are controlled according to M-Bus standard.
Unit addressing
AD-01 can be addressed over the M-Bus protocol in two ways, by using primary
or secondary addressing.
Primary addressing
The primary address is set with switches inside the unit.
see page 11, switch settings / Primary address.
Secondary addressing
The secondary address is based on a unique identification number in every unit.
The AD-01 secondary address is according the unit serial number and can in this
way easily be identified.
The following secondary address parameters is used in AD-01
Parameter Value
ID number 10000000 + serial number*
Manufacturer WMO = 5DAF (hex)
Version software version
Medium Bus / system = 0E (hex)
* Example: unit with serial number 729 has ID number 10000729
Unit configuration
some of the M-Bus protocol applications are implemented in AD-01.
This makes it possible to configure a number of internal parameters.
The following applications are implemented.
Initialisation of slave (SND_NKE)
Selection of data rate
(only if data rate using protocol is selected, see page 11, switch settings /
Data rate functionality).
All data rates from 300 bit/s up to 9 600 bit/s can be configured according to
M-Bus standard.
Selection of slave
selection of slave to be able to use secondary addressing.
slave select is performed according to M-Bus standard.
Set up / Read out of master ports setting
set up or read out of the units master ports setting is made with a specific command
sequence.