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V2 AC500 Hardware 1-51 System data AC500 / Issued: 05.2007
ARCNET
The ARCNET system (Attached Resource Computer Network)
• ARCNET is a system for data transmission in local networks.
• The ARCNET protocol is based on the Token Passing principle.
• By passing an identifier (token) from station to station it is guaranteed, that only one station can start
a data transmission (transmission without collision).
• The order of sequence, in which the stations are accessed, is automatically adapted by the existing
conditions in the network, i.e. that the network is reconfigured automatically each time a station is
added to the network or switched off.
ARCNET bus topology
The networking possibilities of Linear ARCNET
• The Linear ARCNET connects the individual stations directly to each other, i.e. without using any
distribution units.
• Each station is connected to the network by using a T connector.
• Both cable ends must be terminated by termination resistors.
• A maximum of 8 stations can be connected to one Linear ARCNET.
• The maximum cable length of the network is 300 m.
• An additional segment can be connected at the end of the wired segment via an Active Hub (active
distribution unit), see next but one drawing.
Station 1 Station 2 Station 3
T-connector Terminating resistor 93 OhmsTotal length max. 300 m
Figure: Linear ARCNET
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