Schneider Electric Modbus Plus Network Bridge Multiplexer none Manual do Utilizador descarregar pdf (Página 8)

ProWORX NxT User’s Guide

42 l Modbus communications by modem

Ÿ Modem Type: Specifies the kind of modem connected to your

computer.

Ÿ None (default setting): for direct Modbus connections

between the PC and controller without a modem. This setting

disables the other modem options.

Ÿ Dial-Up: For standard modems which do not require a

password. If you are unsure, try this setting first. When you

select a device, NxT asks you for a number to dial.

Ÿ Dial-Chat: For password-protected modems. After the

connection is established, a terminal window opens so you

can enter text. When you select a device, NxT asks you for a

number to dial.

Ÿ Line/J478: For modems with a dedicated telephone line to the

controller. You do not have to type a number to dial. This

setting disables the other modem options.

Ÿ LineRTS: For radio or microwave modems with a dedicated

link to the controller. You don’t have to type a number to dial.

This setting disables the other modem options.

Ÿ Initialization: Some modems require special initialization

commands such as ATZ before they can be used. Type a sequence

of Hayes modem commands in this field for NxT to send to your

modem. Check your modem’s manual for the commands to turn

off error correction, compression, and software flow control and

turn on verbal word results.

Ÿ Dial Command: Type ATDT for tone dialing (default) or ATD for

pulse dialing. This prefix is sent to the modem along with the

phone number you type in the Select Device dialog. To instruct the

modem to pause for half a second, type a comma (,).

Ÿ Command Suffix: Characters appended to every command you

send to the modem, including the Initialization string and Hangup

command. The default is a carriage return and a line feed.

Ÿ Hangup Command: To hang up your modem, NxT sends the

standard Hayes modem command ATH. If your modem uses a

different command, enter it here. This command is prefixed with

,,,+++,,,. Hanging up can take up to three seconds.

5. Click OK.

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Schneider Electric Modbus Plus Network Bridge Multiplexer none Manual do Utilizador Página 8