15
16
C. AT&T standard modular color codes:
4.3 FOUR-WIRE, MULTIPOINT INSTALLATION
Multipoint operation involves the connection of several terminals to
one host port. In such an application, one local Model 1065 is used as
a master unit, and it is connected to several remote Model 1065s that
are acting as slaves.
In a multipoint environment the master Model 1065 transmits con-
tinually. Initiation of two-way communication is RTS controlled by each
“slave” Model 1065 unit. To facilitate multipoint communication, the
master Model 1065 should have its carrier control DIP switch set to
“constantly ON” (S1-8=OFF). Each slave Model 1065 unit should have
its carrier control DIP switch set to “controlled by RTS” (S1-8=ON).
Figure 5 illustrates a typical Model 1065 multipoint application.
4.3.1 Multipoint Twisted Pair Connection
The Model 1065 supports multipoint applications using a star topol-
ogy. Maximum distance between the units will vary based upon the
number of drops, data rate, wire gauge, etc. Call Patton Technical
Support for specific distance estimates. Figures 5 and 6 show how to
wire the one-pair and two-pair cables properly for a Model star topolo-
gy. Note that the ground connection is not needed.
HOST
FIRST SLAVE
SECOND SLAVE
XMT-----------------------------RCV
------------------------------------------------------------------RCV
XMT-----------------------------RCV
------------------------------------------------------------------RCV
RCV-----------------------------XMT
------------------------------------------------------------------XMT
RCV-----------------------------XMT
------------------------------------------------------------------XMT
HOST
FIRST SLAVE
SECOND SLAVE
XMT-----------------------------XMT
------------------------------------------------------------------XMT
RCV-----------------------------XMT
------------------------------------------------------------------XMT
4.4 RS-232 CONNECTION
Connect the synchronous or asynchronous output of your RS-232
device to the DB-25 interface on the rear panel of the Model 1065.
Note: The Model 1065 is wired to connect to a DTE. If your RS-232
output device is DCE, call Patton Technical Support at: (301) 975-
1007; http://www.patton.com; or, [email protected]
for specific installation instructions.
1 - Blue
2 - Orange
3 - Black
4 - Red
5 - Green
6 - Yellow
7 - Brown
8 - Slate
Figure 5. Typical multipoint set-up
