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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

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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