
18 • XEV22D I&O Manual 026-1206 Rev 0 09-FEB-2011
16 E2 MODBUS Network Wiring
• Connect MODBUS Network to the RS485 Connector on the E2 PIB board (Belden 8641 recommended).
• Note to wire the RS485 +/- polarity at the E2 in the reverse
of the XEV22D devices.
• Position the three termination jumpers to the UP (terminated) position to provide RS485 termination at the E2.
• Do not connect the shield of the MODBUS network to the E2 PIB center terminal. Instead, use a 100 ohm 1/2 watt
resistor to connect the MODBUS cable shield to earth ground.
• At each XEV22D device, wire the MODBUS cable to the RS485 +/- terminals and connect the MODBUS shield to
the pin 16 terminal.
• Terminate the end of the MODBUS network at the last XEV22D device on the daisy chain with the MODBUS ter-
mination block (P/N 535-2711), or by connecting a 150 ohm resistor between the MODBUS +/- terminals.
Figure 16-1 - XEV22D to E2 Wiring Diagram
earth ground connection
BELDEN 8641
(TYPICAL)
Keyboard
RS485-1B
+ 0v -
RS-232
E2 Power Interface Board (PIB)
237-4810, Version 1.0 0
E2 Power InterfaceBoard (P.I.B.)
R
Position the three
jumpers to provide
RS485 termination
at the E2
TERMINATE NETWORK
+ 0v -
TX1 RX2RX1
JP4
JP5
JP6
JP1
JP2
JP3
637-4890
White +
Black -
RS485-2A
+ 0V -
EARTH GROUND
Shield
LON
Echelon Terminate Up
RS485-2B
+ 0V -
9600 Baud Only
100 ohm
½ watt
42
1
19
78
18
56
hot key
1715
16
13 14
20
11
12
N
L
+
-
RS- 485
Power In
8(3)A
21
4
1
5
2
3
Second Level
XEV22D-1N0F0 24Vac/dc
B
l
a
c
k
W
h
i
t
e
MODBUS TERMINATION
BLOCK 535-2711 150 ohm
Terminate last device only
B
l
a
c
k
W
h
i
t
e
Black
White
BELDEN 8641
COM 4
8(3)A
Comentarios a estos manuales