Danfoss VLT 6000 HVAC Manual de Serviço descarregar pdf (Página 121)

VLT

6000 HVAC

121MG.60.B1.02 - VLT is a registered Danfoss trademark

Programming

■ Serial communication for FC protocol

Master

Slave 31 (126)

Slave 2

Slave 1

Address 1

Address 2

Address 31 (126)

Serial communication

■ Telegram communication

Control and reply telegrams

The telegram communication in a master/slave

system is controlled by the master. A maximum of 31

slaves (VLT 6000 HVAC) can be connected to one

master, unless a repeater is used. If a repeater is

used, a maximum of 126 slaves can be connected to

one master.

The master continuously sends telegrams addressed

to the slaves and awaits reply telegrams from these.

The response time of the slaves is max. 50 ms.

Only a slave that has received a faultless telegram

addressed to that slave will response by sending a

reply telegram.

Broadcast

A master can send the same telegram at the same

time to all slaves connected to the bus. In such

broadcast communication, the slave does not send a

reply telegram to the master, provided the telegram

has been correctly received.

Broadcast communication is set up in the address

format (ADR), see the next page.

Contents of a character (byte)

■ Protocols

As standard, all VLT 6000 HVAC units have a RS 485

port which enables a choice among three protocols.

The three protocols, which can be selected in

parameter 500 Protocol, are the following:

● Danfoss FC protokol

● Johnson Controls Metasys N2

● Landis/Staefa FLN

If Danfoss FC protocol is to be selected, set

parameter 500 Protocol to FC protocol [0].

A description of Johnson's Control Metasys N2 and

Landis/Staefa FLN is not included in this Design

Guide.

For further information on Metasys N2, please order

MI.60.XX.XX from your Danfoss supplier.

For further information on FLN, please order

MI.60.XX.XX from your Danfoss supplier.

Available from approx. October 1998.

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