Emerson E2 Installation And Operation Manual page 77

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1 2 3 4
637-4890 COM4 ON E2 PIB
RS-485 -2A
+
0V
SHIELDED TWISTED
PAIR BELDEN 8641
RECOMMENDED
REVERSE POLARITY OF
+/- ON RS-485 CABLE
FROM E2 TO DEVICE
WIRE BLACK TO +
_
WIRE WHITE TO
XR35CX/XR75CX
ECT MODBUS
XR35CX, XR75CX TO E2
INSTALLATION GUIDE
XR35CX / XR75CX
DEVICE
5 6 7 8
HOT KEY
RS-485 I/O or MODBUS Net
NOT TERMINATED
RS-485
+
0V
WIRE WHITE TO +
_
WIRE BLACK TO
100 OHM
OBSERVE WIRE ½ WATT
COLOR POLARITY
1. Connect the MODBUS Network to the RS-485 Connector on the
E2 PIB board (Belden 8641 recommended).
2. Note to wire the RS-485 +/- polarity at the E2 in the reverse of
the XR35CX or XR75CX device.
3. Position the three termination jumpers to the UP (terminated)
position to provide RS-485 termination at the E2.
4. Do not connect the shield of the MODBUS network to the E2 PIB
center terminal. Instead, use a 100 ohm ½ watt resistor to connect
the MODBUS cable shield to earth ground.
5. At each device, wire the MODBUS cable to the RS-485 +/- terminals
and connect the MODBUS shield to the pin termi
6. Terminate the end of the MODBUS network at the last device on
the daisy chain with the MODBUS termination block (P/N 535-2711),
or by connecting a 150 ohm resistor between the MODBUS
+/- terminals.
For more information, please refer to the XR35CX user manual
- P/N 026-1203 and the XR75CX user manual -
COM 4
TERMINATED
TO DEVICE
MODBUS TERMINATION
BLOCK (P/N 535-2711)
150 OHM
TERMINATE LAST DEVICE ONLY
TERMINAL XR35CX/XR75CX
The RS485 Network and Hardware Setup
18 nal.
P/N 026-1210.
637-4890 COM4 ON E2 PIB
RS-485
RS-485 -2A
+ +
0V 0V
RESISTOR
100 OHM
½ WATT
BELDEN 8641
EARTH GROUND
CONNECTION
FROM OTHER RS-485
MODBUS DEVICE
MODBUS TERMINAL
BLOCK
• -
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