Serial communication for FC protocol
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 param-
eter 500 Protocol, are the following:
• Danfoss FC protokol
• Johnson Controls Metasys N2
• Landis & Staefa Apogee 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 Apogee FLN is not included in this De-
sign Guide.
For further information on Metasys N2, please order
MG.60.GX.YY from your Danfoss supplier.
For further information on Apogee FLN, please order
MG.60.FX.YY from your Danfoss supplier.
Telegram communication
Control and reply telegrams
The telegram communication in a master/slave sys-
tem 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 ad-
dressed 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 tele-
gram to the master, provided the telegram has been
correctly received.
Broadcast communication is set up in the address for-
mat (ADR), see the next page.
VLT
®
6000 HVAC Series
MG.61.B5.02 - VLT
®
is a registered Danfoss trademark 155
Programming
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