Perle IOLAN + Rack User And Administration Manual page 153

Vmodem (Virtual modem)
Vmodem is a feature of the IOLAN, which provides "modem like" communication between two IOLAN
units on a network. This feature behaves like two modems connected across a telephone line.
Typically, you use the Vmodem feature when you have multiple devices communicating with a central site.
Vmodem allows you to achieve this using a single IOLAN unit at each end of the network without having
to use multiple modems.
You use Vmodem because you want to avoid having to use multiple modems with the associated costs of
calls and connections.
You use this feature by logging into the IOLAN via a terminal or telnet. You then enable and configure the
Vmodem feature on the ports you want to use. You then connect your remote devices to the Vmodem ports
on the IOLAN units.
Configuring ports to use Vmodem
The Vmodem feature has two modes, Normal and Dial on DTR.
In normal mode, the Vmodem ports behave like a modem basic AT commands to connect and disconnect.
In Dial on DTR mode, the unit will automatically connect to a pre-configured destination.
Configuring ports to use Vmodem in Normal Mode
Carry out the following on all the participating IOLAN units;
1. Login to your IOLAN unit using either serial link or telnet as required.
2. Within the CONNECTIONS MENU now displayed, select a FREE connection and press the Enter
key.
Select Commands > Admin mode and press the Enter key.
Select ADMINISTRATION MENU > Password and press the Enter key.
When prompted, enter the password and press the Enter key.
The ADMNINISTRATION MENU is now updated to show additional features available in
administration mode only.
3. In the updated ADMINISTRATION MENU;
Select Port and press the Enter key.
At the Port prompt now displayed, type in the port to be configured for Vmodem and then press the
Enter key.
4. In the PORT SETUP MENU;
Highlight the Access field and press the Enter key.
Select Access >Values and press Enter key.
Select Access > VModem and press the Enter key.
You are now returned to the PORT SETUP MENU.
5. If the AT command +++ATH is required to hang up a connection;
In the PORT SETUP MENU now displayed;
Set the Mode field in the Access area to Telnet.
Otherwise, set the Mode field to RAW.