User`s manual

Ó
Warning:
Use National Electric (NEC)
or other country-specific
standard wiring and safety
practices when wiring and
connecting this controller to
a power source and to elec-
trical sensors or peripheral
devices. Failure to do so may
result in damage to equip-
ment and property, and/or
injury or loss of life.
Watlow EZ-ZONE™ RUI/Gateway • 5 • Chapter 2 Install and Wire
Power
power
power
98
99
CF
CD
CE
B5
B5
D6
D6
D5
D5
Slot C
long case
fuse
power
power
98
99
CF
CD
CE
B5B5
D6
D5
Slot C
short case
fuse
Standard Bus EIA-485 Communications
T-/R-
common
98
99
CF
CD
CE
B5
D6
D5
Slot C
long case
T+/R+
T-/R-
common
98
99
CF
CD
CE
Slot C
short case
T+/R+
• Wire T-/R- to the A terminal of the EIA-485 port.
• Wire T+/R+ to the B terminal of the EIA-485 port.
• Wire common to the common terminal of the EIA-485
port.
• Do not route network wires with power wires. Connect
network wires in daisy-chain fashion when connecting
multiple devices in a network.
• Do not connect more than 16 controllers on a network.
• maximum network length: 1,200 meters (4,000 feet)
• 1/8th unit load on EIA-485 bus
EIA-232/485 Modbus RTU Communications
485 common
485 T-/R-
CA
CB
CC
CA
CB
C5
C3
C2
Slot B
485 T+/R+
485 T-/R-
485 T+/R+
232 common
232 (TX) to DB9 pin 2 (RD)
232 (RD) to DB9 pin 3 (TX)
• Wire T-/R- to the A terminal
of the EIA-485 port.
• Wire T+/R+ to the B termi-
nal of the EIA-485 port.
• Wire common to the com-
mon terminal of the EIA-
485 port.
• Do not route network wires
with power wires. Connect
network wires in daisy-
chain fashion when connect-
ing multiple devices in a
network.
• A termination resistor may
be required. Place a 120 Ω
resistor across T+/R+ and
T-/R- of last controller on
network.
• Do not wire to both the EIA-
485 and the EIA-232 pins at
the same time.
• Two EIA-485 terminals of
T/R are provided to assist in
daisy-chain wiring.
• Do not connect more than
one EZ-ZONE PM controller
on an EIA-232 network.
• maximum number of EZ-
ZONE PM controllers on a
Modbus RTU EIA-485 net-
work: 247
• maximum EIA-232 network
length: 15 meters (50 feet)
• maximum EIA-485 network
length: 1,200 meters (4,000
feet)
• 1/8th unit load on EIA-485
bus.
EZK _-_ 2 _ _-A _ A A
Modbus-IDA
Terminal
EIA/TIA-485
Name
Watlow Termi-
nal Label
Function
DO A CA or CD T-/R-
D1 B CB or CE T+/R+
common common CC or CF common