Schneider Electric Modbus Plus Network Bridge Multiplexer none Manual do Utilizador descarregar pdf (Página 4)

ProWORX NxT User’s Guide

38 l Configuring Modbus communications

Ø To select and configure Modbus communications:

1. From the ProWORXNxT Title Screen or the Offline Network Editor,

on the Controller menu, click Communication Setup. The

Communications Setup dialog box appears.

2. From the Interface list on the left, select Modbus.

3. Set the parameters for your Modbus communication system:

Ÿ Port: Identifies which serial port on your PC is connected to the

controller or modem (if you are connecting to the controller

through one). Default is COM1.

Ÿ Baud: Sets the data transfer speed of your PC’s serial port in bits

per second. The PC and controller must be set to the same baud.

Default is 9600.

Ÿ Parity: Adds a check bit to a packet to make the number of binary

ones always either odd (Odd parity) or even (Even parity). If parity

is set to None, the check bit is not added. The PC and controller

must use the same parity. Default is Even.

Ÿ Stop Bit: Sets the number of bits at the end of a packet prepares the

receiving device for the next packet. The PC and controller must

use the same number of stop bits. Default is 1.

Ÿ Timeout: Specifies the length of time the PC will wait for successful

communication with a controller before displaying an error

message. Default is 2 seconds.

These parameters affect

the PC only. They must

match the parameters

set for the controller.

After you choose a com-

munication system from

the list on the left, its op-

tions appear on the right.

To select Modbus com-

munications, the Modem

Type must be set to None.

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Schneider Electric Modbus Plus Network Bridge Multiplexer none Manual do Utilizador Página 4