TT-1625 7/17
23
DEC 8000 Controller.
On the Decision-Maker
r
8000, the RS-485 connections and the 120
resistor are located on the base module. See
Figure 36.
Note:
On the Decision-Maker
r
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. RS-485 (2) port
2. Pull up jumper
3. 120
resistor, RS-485
4. Pull down jumper
1
2
B
A
COM
3
4
Figure 36
DEC 8000 Base Box and RS-485
Connectors
6.4
P27,
6-pin
RS-485
connections
(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
Modbus
r
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 Modbus
r
devices). Verify that the termination resistor is in
the NON-TERMINATED position on P34
connector on the RSA III master and slaves.
RSA III Master with RSA III Slaves
(with more
than five Modbus
r
devices). Verify that the
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.
Modbus
r
is a registered trademark of Schneider Electric.
Summary of Contents for APM802
Page 14: ...14 TT 1625 7 17 Figure 15 Remote Serial Annunciator Dimension Print ADV 8661A...
Page 15: ...TT 1625 7 17 15 Figure 16 Remote Serial Annunciator Dimension Print ADV 8661B modified...
Page 31: ...TT 1625 7 17 31 Figure 53 RSA III Generator Set and ATS Setup on SiteTecht Sample Screen...
Page 36: ...36 TT 1625 7 17 Figure 57 RSA III Wiring Diagram GM62554A J...
Page 37: ...TT 1625 7 17 37 Figure 58 RSA III Wiring Diagram GM62554B J...
Page 38: ...38 TT 1625 7 17 Figure 59 RSA III Wiring Diagram GM62554C J...
Page 39: ...TT 1625 7 17 39 Figure 60 RSA III Wiring Diagram GM62554D J...
Page 40: ...40 TT 1625 7 17 Figure 61 RSA III Wiring Diagram GM62554E J...
Page 41: ...TT 1625 7 17 41 Figure 62 RSA III Wiring Diagram GM62554F J...
Page 42: ...42 TT 1625 7 17 Figure 63 RSA III Wiring Diagram GM62554G J...
Page 43: ...TT 1625 7 17 43 Figure 64 RSA III Interconnection Diagram ADV 6990A H...
Page 44: ...44 TT 1625 7 17 Figure 65 RSA III Interconnection Diagram ADV 6990B H...
Page 46: ...46 TT 1625 7 17 Notes...
Page 47: ...TT 1625 7 17 47 Notes...
