Contemporary-control-systems BASremote Application Guide Uživatelský manuál stáhnout pdf (Strana 5)

AG-BASR0000-BC0Page 5

Application Guide — BASremote

TR LSO

CONTEMPORARY

Application #2 — Modbus Serial to BACnet Gateway for Unifying Data

Although BACnet is quite popular, there is an

abundance of Modbus Serial equipment that needs to

attach to the building automation system. There are

two approaches to the problem. The rst is to route

Modbus Serial messages from the BASremote Master

MB port to Modbus TCP clients residing on Ethernet.

This is the simplest approach requiring minimal

conguration. The BASremote Master would act as a

proxy for a Modbus TCP client, initiating a command to

a connected Modbus Serial slave. When the slave

responds, the message is forwarded to the Modbus

TCP client. The resident BASremote Master I/O can

be queried in a similar fashion.

The second approach is to utilize the gateway

capability within the BASremote Master. Using an

off-line spreadsheet, Modbus registers and slave

addresses are mapped along side BACnet object

instances. The spreadsheet creates a CSV le which

is downloaded into the BASremote Master for periodic

scanning. The result is that attached Modbus Serial

devices can be viewed as BACnet objects.

BASremote Master

Modbus 2 BACnet Device Proling

Power

Meter

Drive

Modbus

1 2 3 4 5 6 7 8 9 10 11 12 13

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Contemporary-control-systems BASremote Application Guide Uživatelský manuál Strana 5