Dec 8000 Base Box And Rs-485 Connectors - Kohler APM802 Installation Instructions Manual

DEC 8000 Controller. On the Decision-Makerr
8000, the RS-485 connections and the 120 
resistor are located on the base module. See
Figure 36.
Note: On the Decision-Makerr 8000, the polarity
of the RS-485 connections is reversed
when compared to the RSA III. Connect
the black (--) wire to the B connection and
the white (+) wire to the A connection on
the controller base box.
Note: When using RS-485 communication
cable, connect the "shield" wire at the
RSA III P27 connection but not at the
controller connection. Tape to insulate
unused end.
1
1. RS-485 (2) port
2. Pull up jumper
3. 120  resistor, RS-485
4. Pull down jumper
Figure 36 DEC 8000 Base Box and RS-485
Connectors
TT-1625 7/17
6.4
3
2
4
Modbusr is a registered trademark of Schneider Electric.
P27, 6-pin RS-485
(communication between RSA III master and
RSA III slave. Select and connect the RS-485
wiring from the RSA III master to the RSA III
slave(s) in a daisy chain wiring configuration
using Belden #9841 or equivalent. Figure 23
shows the master/slave RS-485 connections and
Figure 20 shows the RSA III with P27 location.
See the wiring diagrams in Figure 57 to Figure 63
for additional information regarding master/slave
RSAs.
Connect RS-485 wiring to 6-position Euroblock
plug 294619 (included) and plug into the RSA III
circuit board. The Euroblock connector is
polarized and attaches in one position only.
Each RSA III is shipped with a termination
resistor in the NON-TERMINATED position on
P34 connector. If there are more than five
Modbusr devices connected on the network
place the termination resistor in the last RSA
slave.
Determine the position of the termination resistor
in P34 connector based on the following
applications.
RSA III Master only or RSA III Master with
RSA III Slaves (with up to five Modbusr
devices). Verify that the termination resistor is in
the NON-TERMINATED
connector on the RSA III master and slaves.
RSA III Master with RSA III Slaves (with more
than five Modbusr devices).
termination resistor is in the IN position on P34
connector on the last RSA III slave in the daisy
chain connection. Place the termination resistor
in the NON-TERMINATED position on P34
connector on the RSA III master and all RSA III
slaves except the last RSA III slave.
Note: Controllers, when communicating with the
RSA III, are considered slaves. If the
controller is the last device in the network,
use a terminating resistor on the controller.
The APM802 and DEC 8000 controllers
have a terminating resistor located on the
controller. See Figure 36 and Figure 24.
connections
position on P34
Verify that the
23