User's Manual

Installation
Issue 1 November 1998 19
Figure 7. RS-485 Network Connection Using Modular Jacks
The EOL Terminators
Plug EOL terminators into the wallboards that are on the ends of an
RS-485 transmission line. Insert the EOL terminators into the RJ11
ports (labeled RS-232 IN or TTL) on the wallboards.
The converter box has a termination switch with “Terminated” and
“Unterminated” settings. If the converter box is on one end of an
RS-485 transmission line, set the termination switch to “terminated”
WH
BR
YL
GN
BL
OR
BK
RD
8 ft.
max
To RS-485 out/
RS-485 in port
on wallboard
4-wire, 8 ft.
RS-485 cable
Plug into surface
jack/junction box
Connect shield
Connect positive
485 wire
(sometimes black)
Connect negative 485 wire
(sometimes red) to yellow
wire to red
Surface jack/
junction box
to black