APC ACFS76080 Installation Manual download pdf (Page 90)

Uniflair LE Accessories Manual88

Device Instance: The number that uniquely identifies a device inside the BACnetÆË network (the BACnetÆË

network can also include non-MS/TP BACnetÆË devices). If two units have the same Device Instance,

identification errors will be generated.

Station Address: The number that differentiates the units in the BACnetÆË MS/TP network. If two units have

the same Station Address, identification errors will be generated. To speed up the data exchange between the

Master units, the Station Address of the Master units should start from 0 and continue without skipping any

numbers.

Max Info Frames: This establishes the maximum number of information packages exchanged. When this

number is exceeded, the Master unit gives up control (Token) of the network to another Master unit. It indirectly

establishes a priority between the Master units in the network. High numbers guarantee the Master a higher

data exchange volume.

MaxMaster: To speed up data exchange between the Master units, MaxMaster should be set to the Station

Address of the Master with the highest Station Address.

Each Master unit, after having used the network, passes over control to the next Master. The MaxMaster

parameter specifies to pCOnet the address of the network Master with the highest Station Address. Using this

parameter, pCOnet will know that there is no other Master with a higher Station Address than MaxMaster.

pCOnet then gives control of the network to the next Master, however not beyond MaxMaster. If no next Master

is found, the cycle begins again, with control being given to the Master with the lowest Station Address.

BaudRate: The data transfer speed. The BaudRate must be the same for all the devices connected, otherwise

the exchange of data will generate communication errors. For extended networks, low baud rates should be

specified. This guarantees less communication errors. If the Baud Rate is 76800, make sure that the device

supports this communication speed. This baud rate is not supported by the RS232 serial port on a normal PC.

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APC ACFS76080 Installation Manual Page 90