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Communications Setup
70
372 SPU 780 01EMAN May 2002
Modem Type
Descriptions
Modem Type specifies the kind of modem connected to your computer:
Modbus Modem
Parameter
Descriptions
Set the following Modem parameters:
When you have finished configuring the parameters, press OK.
Modem Type Description
None (Default) For direct Modbus connections between the PC and controller without a
modem. This setting disables the other modem options.
Dial-Up For standard modems which do not require a password. If you are
unsure, try this setting first. When you select a device, ProWORX 32
asks you for a number to dial.
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,
ProWORX 32 asks you for a number to dial.
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.
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.
Parameter Description
Phone Number The phone number of the modem that the PLC is attached to.
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 ProWORX 32 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.
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 (,).
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.
Hangup Command To hang up your modem, ProWORX 32 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.