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2-5
H Total Drop Line Length
The total drop line length is the total sum length of all the drop lines (but not including the trunk line). Do
not exceed the maximum total drop line length (even when the length of each individual drop line is 6 m
or less). The standard for the total drop line length varies with the baud rate as shown in the previous
table.
H Configuration Example
The following configuration example shows the maximum length of the Network, the drop line lengths,
and the total drop line length.
Terminating
Resistor
Node
Node
2 m
Node
1 m
Node
2 m
Node
Node
Terminating
Resistor
2 m
3 m
Node
Node
6 m
2 m
2 m
1 m
1 m
Node Node Node
6 m 6 m 6 m
Trunk line
10 m
Trunk line
10 m
Trunk line
20m
Drop line
5 m
Drop line
2m
Drop line
6 m
Drop line
6 m
The longest distance between nodes is 48 m, and the distance between the two
Terminating Resistors is 40 m. The maximum Network length is therefore 48 m.
There are four branch points in the trunk line. The length of each drop line is
shown in the diagram. The maximum drop line length is 6 m.
The sum of all the drop lines is 40 m.
2-2-2 Locating Terminating Resistors
Be sure to connect the Terminating Resistors at both ends of the trunk line to reduce signal reflection
and stabilize communications.
When there is a T-branch Tap 6 m or less from the end of the trunk line (or the node):
A Terminating Resistor attached to a T-branch Tap can easily be mounted without taking up much
space.
When there is not a T-branch Tap 6 meters or less from the end of the trunk line (or the node):
A Terminating Resistor must be connected before that point. Either a T-branch Tap mounted to a
Terminating Resistor or a terminal block with Terminating Resistor can be used. In this case, be sure
to make the cable length 1 m or less from the node to the Terminating Resistor.
Node at end of trunk line
Truck line
Node
T-branch Tap mounted to a Terminating Resistor
or a terminal block with Terminating Resistor.
1 m or less
Maximum Network
Length
Drop Line Length
Total Drop Line Length
CompoBus/D Communications Line Design Chapter 2