Watlow ez-zone pm - Communications Setup and Wiring

Watlow EZ-ZONE
®
PMI Controller • 45 • Chapter 2 Install and Wire
Standard Bus EIA-485 Communications
T-/R-
common
98
99
CF
CD
CE
B5
D6
D5
Slot C
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 EZ-ZONE PM controllers on a network.
• Maximum network length: 1,200 meters (4,000 feet)
• 1/8th unit load on EIA-485 bus
PM [4,6,8,9] _ _ _ _ - [*] _ _ _ _ _ _
* All models include Standard Bus communications (instance 1)
Note:
Do not leave a USB to EIA-485 converter connected to Standard Bus without power (i.e.,
disconnecting the USB end from the computer while leaving the converter connected on
Standard Bus). Disturbance on the Standard Bus may occur.
Modbus RTU or Standard Bus EIA-485 Communications
T-/R-
common
98
99
CC
CA
CB
B5
D6
D5
Slot C
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.
• A termination resistor may be required. Place a 120 Ω resistor across T+/
R+ and T-/R- of last controller on network.
• Only one protocol per port is available at a time: either Modbus RTU or
Standard Bus.
• Do not connect more than 16 EZ-ZONE controllers on a Standard Bus net-
work.
• Maximum number of EZ-ZONE controllers on a Modbus network is 247.
• Maximum network length: 1,200 meters (4,000 feet)
• 1/8th unit load on EIA-485 bus.
• Communications instance 1
PM [4,6,8,9] _ _ _ _ - [1] _ _ _ _ _ _
Note:
Do not leave a USB to EIA-485 converter connected to Standard Bus without power (i.e.,
disconnecting the USB end from the computer while leaving the converter connected on
Standard Bus). Disturbance on the Standard Bus may occur.