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2-4
2-2 Network Configuration Restrictions
CompoBus/D communications are designed to meet a wide range of applications by providing a choice
of baud rates and allowing different combinations of T-branch and multi-drop connections. The restric-
tions of CompoBus/D communications that are required to enable the various communications possibi-
lities are described here.
2-2-1 Baud Rate and Communications Distance
The maximum length of the CompoBus/D communications cables is restricted by the baud rate and the
type of cable used. The three types of restrictions on CompoBus/D communications cable length are as
follows:
S Maximum network length
S Drop line length
S Total drop line length
Be sure to design and configure a Network that meets the conditions provided below to ensure reli-
able communications.
H Maximum Communications Distance
Baud rate
Maximum network length
Drop line length Total drop line
Thick Cable Thin Cable
length
500 kbps 100 m max. 100 m max. 6 m max. 39 m max.
250 kbps 250 m max. 100 m max. 6 m max. 78 m max.
125 kbps 500 m max. 100 m max. 6 m max. 156 m max.
Note Thick Cable (5-wire): DCA2-5C10 (100 m)
Thin Cable (5-wire): DCA1-5C10 (100 m)
H Maximum Network Length
The length of the Network is longest at either the distance between the two most distant nodes or at the
distance between the Terminating Resistors.
There are two types of cables: Thick Cables and Thin Cables. The cable thickness affects signal deteri-
oration. The maximum length of the Network therefore depends on the type of cable used as shown in
the previous table.
The following restrictions apply to Networks in which both Thick and Thin Cables are combined.
Baud rate Maximum Network length
500 kbps
Thick Cable length + Thin Cable length x 100 m
250 kbps
Thick Cable length + 2.5 Thin Cable length x 250 m
125 kbps
Thick Cable length + 5.0 Thin Cable length x 500 m
H Drop Line Length
The length of the drop line is measured from the point in the trunk line where the original branch was
made to the end of the branch. The maximum length of a drop line is 6 m. It is possible to make a second-
ary branch from a drop line.
CompoBus/D Communications Line Design Chapter 2