Eaton Electrical ELC-485APTR - Manual (Page 2)

IL05003022E.pdf
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Compact Installation reference:
See Fig. 3a in lower left, when ELC-485APTR is separated from mounting plate, it can be used as the last extension module
with its RS-485 port connecting to ELC controller’s (see Fig. 3b for illustration). This connection is feasible for ELC controller to
connect AC Motor Drive within 5 meters.
MVX 9000
EL
C
-EX0
8N
N
D
N
RS
-2 32
RS
-4 85
x16
EL
C
-PC
12
N
N
D
R
0
1
STOP
0
1
RUN
x16
E
LC-
CO
PB
DP
Fig. 3a Fig. 3b
PIN Explanation of COM1, COM2, and RJ12
COM1-DB9 female PIN Definition RJ12 of AC Motor Drive side PIN Definition
1 RS485- 1 +15V
2 RS485+ 2 GND
3 RS485+ 3 SG-
4 RS485- 4 SG+
1
2
3
4
5
6
7
8
9
5~9 NC 5, 6 Reserved
COM2-DB9 male PIN Definition RJ12 of ELC-485APTR side PIN Definition
3, 6 RS485- 3 RS-485+
8 RS485+ 4 RS-485-
5, 9 GND 5 GND
5
2
1
4
3
6
7
8
9
1, 2, 4, 7 NC 1, 2, 6 NC
4 ELC-485APTR Termination Resistor Application
In all RS-485 installations, the cable must be correctly terminated with two sets of resistors, one set at each end of the network
(4,000 feet maximum total cable length). This applies even if you are only using one slave node connected to one master
device. The terminating resistors prevent reflection problems that can interfere with data transmission. The resistance value of
the terminating resistors should match the characteristic impedance of the cable. A typical value is 120 ohms. The terminating
resistors must be placed at the two farthest ends of the RS-485 network, regardless of where the master device is. In some
cases master device RS-485 ports have built in or optional terminating resistors. Beware of your network (whether it has one
node or 32 nodes) having only two sets of terminating resistors.
ELC-485APTR’s Termination Resistor Switch is located inside of the
adapter’s extension port.
Switch ON the termination resistor for ELC-485APTR on the both ends only
and switch OFF (factory setting) for the modules between both ends when
modules are connecting in parallel.
Termination Resistor Switch
Fig. 4