Belkin F5U104-EU-F Instrukcja Użytkownika Pobierz pdf (Strona 4)

EXCEL WEB CONTROL SYSTEM – NETWORKING WHITE PAPER

EN2B0396GE51 R1214 - 4 -

BACnet Communication Settings

• If Excel Web controllers shall communicate to

devices in other IP subnets, then the default

gateway address must be set correctly. This is done

in the Honeywell CARE engineering tool.

General

To start with, APDU (Application Program Data Unit) settings

should be left as set by default in the Honeywell CARE

engineering tool. Change these settings only if required and

only after consultation of the person responsible for the

BACnet system integration.

If some Excel Web controllers of one CARE project are

located on BACnet/IP and other devices are located on

BACnet/MSTP networks, then the Max APDU Length should

be set to 480 (CARE will automatically set Max APDU

Length).

• Max APDU Length

• Max Segments accepted

• APDU Timeout

BACnet Routers

BACnet Routers may connect different BACnet Networks with

different media. When for example devices in a

BACnet/MSTP network communicate with Excel Web

controllers on a BACnet/IP network, then there may be

restrictions to the APDU length. In this case some Messages

may not work.

It is recommended to set Max APDU Length to the smallest

APDU length in the network.

Please also refer to chapter Network Integration checklist for

more details.

BACnet Network numbers must be unique on the whole

BACnet internetwork.

BACnet /IP communication - NAT

routers

BACnet cannot be used over NAT routers.

The main workaround here is to use VPN, refer to the

“Honeywell BACnet architecture best practices” for more

details on this solution.

Another workaround is to have a BBMD in the BACnet

network, which is reachable over the internet. A remote

workstation can register itself as a foreign device with this

BBMD.

Broadcasts

In a BACnet System the below listed broadcasts are

mandatory in order to allow BACnet Clients and Servers to

identify each other.

Typically these broadcasts are created upon start-up of a

BACnet device or whenever the BACnet MAC address or the

route to a device is unknown.

• “Who-Is” and “I-am” (used for identification of

BACnet devices on the network)

• “Who-Is-Router-To-Network” (used to identify

BACnet routers on the network)

In addition the Excel Web controller will create the following

broadcasts as proprietary BACnet telegrams:

• User Synchronization, created upon change,

deletion or addition of users.

This will synchronize the user administration for

Browser Access in all Excel Web controllers in the

same (CARE) project on the network.

• BACnet Calendar Synchronization, created upon

change, deletion or addition of BACnet calendars.

This will synchronize all BACnet calendars in all

Excel Web controllers in the same (CARE) project

on the network.

• Number of active Alarms in a controller

The above synchronization messages are issued whenever a

change occurs and cyclically.

Alarm synchronization is used between all Excel Web

controllers on the BACnet internetwork.

BACnet Broadcast Management Decice

If a BACnet Network spreads over different IP Subnets, then

the use of BBMDs is required. Please refer to chapter

Network Integration checklist for more details.

Terminal Access

For Linux download and for troubleshooting Excel Web

allows for terminal access on a dedicated serial port (serial

port no. 1)

Modem Access

Excel Web does not support BACnet/PTP.

Excel Web allows for access via analogue modem, ISDN

adapters or GSM adapters via its dedicated serial

port no. 3. In order to do so a remote connection via serial

interface needs to be established on the client PC/Laptop.

The following usage scenarios are typical:

• Modem access with Internet Browsers (dial-in)

• Modem access with the Honeywell CARE

engineering tool (dial-in)

NOTE: Due to network security issues, it is NOT

recommended to have a modem directly connected to an

Excel Web controller which is sitting in the network. Use the

RAS access of the network instead.

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