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4.2.1 STAR TOPOLOGY
Using a star topology, you may connect several Model 2086
Series together in a master/slave arrangement. Maximum distance
between the units will vary based upon the number of drops, data rate,
wire gauge, etc. Call Technical Support for specific distance estimates.
Figure 2 (below) shows how to wire the two-pair cables properly
for a Model 2086 Series star topology. Note that the ground connec-
tion is not needed.
HOST
FIRST SLAVE
SECOND SLAVE
XMT+ RCV+
RCV+
XMT-
RCV-
RCV-
RCV+
XMT+
XMT+
RCV-
XMT-
XMT-
Figure 2. Star wiring for Model 2086 Series host and slaves
4.2.2 DAISY CHAIN TOPOLOGY
Using a daisy chain topology, you may connect several Model
2086 Series together in a master/slave arrangement. Maximum dis-
tance between the units will vary based upon the number of drops,
data rate, wire gauge, etc.
Figure 3 (below) shows how to wire the two-pair cables properly
for a Model 2086 Series daisy chain topology. Note that the ground
connection is not needed.
HOST
FIRST SLAVE
OTHER SLAVE(S)
XMT+---------------------RCV+ -----------------------RCV+
XMT- ---------------------RCV- -----------------------RCV-
RCV+---------------------XMT+ -----------------------XMT+
RCV- ---------------------XMT- -----------------------XMT-
Figure 3. Daisy chain wiring for Model 2086 Series host and slaves
4.3 CONNECTION TO THE RS-232 INTERFACE
The Model 2086 Series is configured as a modem DCE. Once you
have properly configured the Model 2086 Series and connected the
twisted pair wires correctly, simply plug the Model 2086 Series directly
into the DB-25 DTE port of the RS-232 device. Remember to insert
and tighten the two captive connector screws.
(Note: If you must use a cable to connect the Model 2086 Series
to the RS-232 DTE device, make sure it is a
straight through cable of
the shortest possible length—we recommend 6 feet or less).
4.4 4-Wire Connection Using Terminal Blocks
If you purchased the Models 2086M or 2086F, you will need to
open the case to access the terminal blocks. The following instructions
will tell you how to open the case, connect the bare wires to the termi-
nal blocks, and fasten the strain relief collar in place so that the wires
won't pull loose.
1. If the case is not already open, open it now by twisting it open
with a small plastic screwdriver.
2. Strip the outer insulation from the twisted pairs about one inch
from the end.
3. Strip back the insulation on each of the 2 twisted pair wires
about .25 inch.
4. Place the cable through the end plate, and make a small loop
in the cable and feed the cable under the tie wrap which is cur-
rently installed in the board. When you have completed this
assembly it should resemble figure 4. Connect
one pair
of wires to XMT+ and XMT- (transmit positive and negative)
on the terminal block, making careful note of which color is
positive, and which color is negative.
