Schneider Electric Modbus Plus Network Bridge Multiplexer none Manuel d'utilisateur télécharger pdf (Page 5)

Chapter 3 Connecting to a Controller

Modbus communications by modem l 39

Ÿ Mode: Identifies which data protocol (Remote Terminal Unit or

ASCII) to use. Both the PC and controller must use the same data

protocol. Default is RTU.

4. Do one of the following:

Ÿ If your computer is connected directly to the controller, set the

Modem Type drop-down menu to None, then click OK.

Ÿ If your computer connects to the controller’s Modbus port through

a modem, set the parameters in the Modem box.

Modbus communications by modem

You can easily configure ProWORX NxT to connect to controllers through

dial-up and dedicated-line modems. Before you begin, confirm that

Ÿ The controller is properly connected to its RS-232 modem.

Ÿ Your computer is properly connected to its modem.

Ÿ The modems’ DIP switches, if they have them, are set like this:

After configuring NxT to use a modem, it checks to see whether there is an

active connection each time you select a device on your network.

Ÿ If it cannot find one, NxT asks you for a phone number to dial or, if

your modem uses a dedicated line, opens a connection automatically.

Modem DIP Switch Setting

Example: U.S. Robotics Modem

DIP Switches (seen from back)

Data Terminal Ready Always On Switch 1 (on left): Down

Verbal Word Results Switch 2: Up

Result Code Display Enabled Switch 3: Down

Command mode local echo Switch 4: Up

Auto Answer Switch 5: Up

Carrier Detect Normal Switch 6: Up

Load Non-Volatile RAM Defaults Switch 7: Up

Use AT Command Set (Smart Mode) Switch 8 (on right): Down

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Schneider Electric Modbus Plus Network Bridge Multiplexer none Manuel d'utilisateur Page 5