LonWorks Option Board User Manual
MN04003008E
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3-3
April 2004
Table 3-2. Grounding the Bus Cable Shield, continued
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 LonWorks board must be set accordingly. Use 94-ohm termination
resistance when only one termination is needed and 47-ohm for two terminations.
Figure 3-2: Using Jumper X5 to Set the Bus Termination
Step
Procedure
D
If the LonWorks board was detached from the
control unit, place it into slot E of the control
board (see
Page 4-2
). Otherwise attach the
terminal block. Fix the cable on the frame
with the clamp.
H3
H2
H1
47
Ω
94
Ω
No Termination
21
22
X5
X5
23
