Vacon OPTC4, User Manual

Page: 10 / 32

10 • vacon layout and connections
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3
3.3 Bus termination resistors
To assure a proper data transmission, termination of the network segments is required. Depending
on the type of network, either one or two terminations are necessary. Free topology network segment
requires only one termination whereas a doubly terminated bus topology requires two.
The jumper X5 on the Vacon LonWorks board must be set accordingly. Use 94-ohm termination
resistance when only one termination is needed and 47-ohm for two terminations.
Figure 3-7. Using jumper X5 to set the bus termination.
3.4 LED indications
The three LED indications next to the connector show the present statuses of the Neuron (green H3),
the LonWorks board (yellow H2) and the Fieldbus Module (green H1). From the user's viewpoint, the
first two are the most significant.
Figure 3-8. LED indications on the LonWorks board
H3 Neuron Service LED GREEN
H2 Board Status YELLOW
H1 Bus Status GREEN
21
22
23
H3
H2
H1
X5
lw1.fh8
47
Ω
94
Ω
no termination
X5
21
22
23
H3
H2
H1
X5
lw1.fh8