User Manual

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Building Technologies M-bus System CE1P5361en

HVAC Products 8 Addendum 08.02.2007

8.3 Search run of central units OZW10 and

OZW111

The OZW10 and OZW111 identify connected M-bus devices with the help of their auto-

matic search run.

To match the search behavior of the central units to actual needs, they can be config-

ured with the help of ACS Service or ACS Operation using the "Applications – Popcard"

menu on page "Setup M-bus":

 Type of addressing on the M-bus (the types of addressing of the M-bus are de-

scribed in subsection 5.4.2 "Fundamentals"):

 Primary addressing: The search run only searches for primary-addressed devices.

The primary addresses of the M-bus device are between 1 and 250. Each device

must have a unique address. Not all devices have a primary address. Some de-

vices only have a secondary address

 Secondary addressing: The search run only searches for secondary-addressed

devices. The secondary address space is nearly unlimited. When supplied, each

secondary-addressable device already has a unique secondary address. Depend-

ing on the type of device, the secondary address can be changed by changing the

customer number. Note: If a secondary-addressed device also has a primary ad-

dress (>0), it will then only be addressed with its primary address

 Primary and secondary addressing: The search run searches for primary- and

secondary-addressed devices

 Baud rates on the M-bus: Here, it is possible to select the Baud rates at which

the central unit searches for devices on the M-bus:

 The OZW10 can search for devices at Baud rates of 300, 2,400 and 9,600. The

default setting is 300 and 2,400 Baud

 The OZW111 can search for devices at Baud rates of 300 and 2,400. The default

setting is 300 and 2,400 Baud

Number of M-bus devices: This setting is only available with the OZW10 and de-

fines when the search run shall be aborted. The OZW10 starts the search run as

soon as this setting is changed. It stops the search run as soon as the respective

number of devices has been found. The number of M-bus devices also includes all

devices of the Siemeca™ AMR system that are connected to the M-bus via the

WTX16 or WTT16 radio nodes: Other radio nodes, MEGATRON

2, VOLUTRON

WHE26 or AEW36.2.

 Device search run: This setting is only available with the OZW111. This type of

central unit starts the search run when setting it to "On". All entries relating to the

devices previously found will be canceled. The search run is completed when the

value changes back to "Off"

 Number of M-bus devices (actual): Here, the number of M-bus devices found is

displayed. Each of the 2 activated inputs of the AEW… is regarded as 1 device.