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ECT MODBUS The RS485 Network and Hardware Setup • 6-19
MultiFlex ESR INSTALLATION GUIDE
1. Connect the MultiFlex ESR to the I/O Network.
RS485 I/O NET
NO TERMINATION
(Jumpers in the
DOWN position)
JP2 JP3
JP4
TERMINATION
(Jumpers in the
UP position)
JP2
JP3
JP4
S1
Set the network address
using the first 5 rockers
of dip switch S1.
Valid address range 1-31.
2345678
1
ON
2345678
1
ON
2
3
4
5
6
7
8
1
ON
2345678
1
ON
BOARD 1 BOARD 2 BOARD 3 BOARD 4
2
3
4
5
6
7
8
1
ON
2
3
4
5
6
7
8
1
ON
2
3
4
5
6
7
8
1
ON
2
3
4
5
6
7
8
1
ON
BOARD 5
BOARD 6
BOARD 7
BOARD 8
2345678
1
ON
2345678
1
ON
2
3
4
5
6
7
8
1
ON
2345678
1
ON
BOARD 9 BOARD 10 BOARD 11 BOARD 12
2
3
4
5
6
7
8
1
ON
2
3
4
5
6
7
8
1
ON
2
3
4
5
6
7
8
1
ON
2
3
4
5
6
7
8
1
ON
BOARD 13
BOARD 14
BOARD 15
BOARD 16
2345678
1
ON
2345678
1
ON
2
3
4
5
6
7
8
1
ON
2345678
1
ON
BOARD 17 BOARD 18 BOARD 19 BOARD 20
2
3
4
5
6
7
8
1
ON
2
3
4
5
6
7
8
1
ON
2
3
4
5
6
7
8
1
ON
BOARD 21
BOARD 22
BOARD 23
2
3
4
5
6
7
8
1
ON
BOARD 24
2345678
1
ON
2345678
1
ON
2
3
4
5
6
7
8
1
ON
2345678
1
ON
BOARD 25 BOARD 26
BOARD 27 BOARD 28
2
3
4
5
6
7
8
1
ON
BOARD 29
2
3
4
5
6
7
8
1
ON
2
3
4
5
6
7
8
1
ON
BOARD 30
BOARD 31
WIRE + to + (same color)
WIRE SHIELD TO CENTER PIN
WIRE - to - (same color)
0V
SHIELDED TWISTED PAIR
BELDEN #8761. FOR PLENUM,
USE BELDEN #82761, 88761,
OR EQUIV.
I
/
O
N
E
T
+485
-485
1
2
3
4
POWER
AC2
AC1
GND
I
/
O
N
E
T
S1
JP2 JP3
JP4
NETWORK
2
3
4
5
ECT Flow
ESR 12 or
ESR 20 Valve
Stepper valve harness
Valve connectors on the
MultiFlex ESR board (1-8)
For Sporlan valves match
all wire colors the
green wire. Instead, connect
the green wire to the silk screen
blue wire legend.
except
Use the cable harnesses
that are supplied with the valves.
(A valve cable harness may not
be longer than 150 feet)
6
5
WIRING FOR 640-0080, 80VA,
24VAC Center-Tapped Transformer
Power Wiring Types:
14 AWG Belden 9495
18 AWG Belden 9493
PRIMARY SIDE
240 208
C
120
(
N
E
U
T
R
A
L
)
(
H
O
T
)
120/208/240 VAC
L2
L1
SECONDARY SIDE
Three-conductor non-shielded cables
are the recommended wire
for connecting between the
center-tapped transformer
and MultiFlex ESR boards.
24V CT 24V
AC1
GND
AC2
AC1
AC2
24VAC Center-Tapped
Earth ground the
GND (center-tapped)
terminal of each board
GND
6
4. Set the termination jumpers UP (terminated) if at
either end of a daisy chain. Otherwise, set jumpers DOWN
(no termination).
2. Set the network address on the first five rockers of the
dip switch (labeled S1) on the MultiFlex ESR board.
3. Set the network baud rate using rockers 6 and 7.
6. Connect the MultiFlex ESR to a Class 2, 80VA
24VAC power transformer. (One MultiFlex ESR board
per transformer.) For more information on transformer wiring,
refer to the MultiFlex ESR manual ( ).
center-tapped
P/N 026-1720
5. Wire each stepper valve by connecting the stepper valve
harness to one of the eight connectors along the top
of the board.
VALVE 1 VALVE 2
VALVE 3
VALVE 7
VALVE 4
VALVE 5
VALVE 6
VALVE 8
VALVE 4
VALVE 5 VALVE 6
VALVE 7 VALVE 8
VALVE 3
VALVE 2
Valve 1 connector
enlarged to show
harness wire color
orientation:
DAISY CHAIN CONFIGURATION
SET TERMINATING JUMPERS:
BLU
R BLK
W
Wire color legend silk screened
on each valve connector (8)
(Match wire colors to
silk screen legend
on valve connectors)