Using the Modbus Ports

Modbus Port 2

Two Types of

Modbus Port 2 is available in two types:

 

Port

 

 

 

 

 

Component

Type of Port

Type of Connector

 

 

 

 

 

 

 

171 CCS 780 00

Built-in, dedicated RS485

9-pin D-shell connector

 

 

171 CCC 780 10

port

 

 

 

171 CCC 980 20

 

 

 

 

171 CCC 980 30

 

 

 

 

Processor Adapters

 

 

 

 

 

 

 

 

 

172 JNN 210 32

User may configure port as

RJ45 phone jack connector

 

 

Serial Option Adapter

RS232 or RS485*

 

 

 

 

 

 

 

 

*If the Option Adapter is combined with the 171 CCS 780 00, or 171 CCC 780 10,

 

 

171 CCC 980 20 or 171 CCC 980 30 Processor Adapter, the Modbus port on the Option

 

 

Adapter will be disabled.

 

 

 

 

 

 

 

Features of an

 

 

 

Modbus Port 2 can be configured as an RS485 port. RS485 supports two-wire or

RS485 Port

four-wire cabling. A multimaster/slave system must use two-wire cabling. A single

 

 

master/slave system may use two- or four-wire cabling.

 

 

The RS485 protocol handles messaging over long distances with higher level of

 

 

noise immunity than RS232 without the need for modems.

Limit of Two

 

 

 

The Momentum M1 Processor Adapters can support a maximum of two Modbus

Modbus Ports

ports.

 

 

If a 172JNN 210 32 Serial Option Adapter is used in conjunction with a

171 CCS 780 00 or 171 CCC 780 10 Processor Adapter, the RS485 port on the Processor Adapter becomes Modbus Port 2. The port on the Option Adapter becomes electrically neutral and does not support any communication activities. (The TOD clock and battery backup system on the Option Adapter continue to work.)

Continued on next page

120

870 USE 101 10 V.2

Page 120
Image 120
Schneider Electric Processor Adapter manual Two Types, Features of an, RS485 Port, Limit of Two, Modbus Ports