Modbus rtu or standard bus eia-485 communications, Watlow ez-zone, Rmc module – Watlow EZ-ZONE RMC User Manual
Page 35: Chapter 2 install and wire, Ez-zone
Watlow EZ-ZONE
®
RMC Module
•
32
•
Chapter 2 Install and Wire
Modbus RTU or Standard Bus EIA-485 Communications
T-/R-
common
Slot C
T+/R+
98 99
CC CA CB
CZ CX CY
• Wire T-/R- to the A ter-
minal 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 mul-
tiple devices in a net-
work.
• 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 con-
trollers on a Standard
Bus network.
• 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
RMCxxxxxxxx(1)xx
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-IDA
Terminal
EIA/TIA-485
Name
Watlow Terminal
Label
Function
DO
A
CA or CD
T-/R-
D1
B
CB or CE
T+/R+
common
common
CC or CF
common
D
E
A
B
D
E
A
B
S
M
1
9
2
10
3
11
4
12
5
13
6
14
7
15
8
16
RM
1
EZ ZONE
R
S
lo
t C
98 99 CF CD CE CZ CX CY
98 99 CF CD CE CZ CX CY
Use twisted pair wires such as Cat 5 cabling.
Do not route with power carrying conductors.
LINX
Model 485TB-2W
U
S
B
A(-)
A(-)
B(+)
B(+)
GND
B B electronics
&
TM
U
USB Serial Conversion
0847-0326-0000
EZ-ZONE
®
RM
to B&B Converter
Model ULINX 485USBTB-2W
USB to RS-485 Adapter
using Standard Bus
TM
USB
Port
Data format
38,400 baud
8 data bits
no parity
1 start bit
1 stop bit
PC Software Protocol - Standard Bus
EZ-Configurator