Mitsubishi RS232/485/LAN Serial Communication Control Uživatelský manuál stáhnout pdf (Strana 19)

7. Practical examples

Direct Phone VCOM to a Twido

The remote connection that we will use in this example is a “Direct Phone

Connection”. This connection consists in calling the eWON using a standard modem

to set up a PPP (point to point) connection. For this, we need to configure the eWON

as PPP server. The eWON will then pick up the phone, authenticate the caller and

assign an PPP IP address to the eWON and to the PC for the remote connection.

For our example, we will assume to have a layout as described in the following

picture:

eVCOM (Standard serial communications) Page 19/29

NOTE

In this manual we explain the communication using a direct phone connection.

Just keep in mind that with the eWON you can also make this communication

using other connection types like Internet connection, GPRS connection, VPN

connection or using Callback features.

IMPORTANT

Using eVCOM to reach a Twido PLC is done here only for example

purpose.

As Twido PLC is a Modbus-RTU device and as Twidosoft handles

Modbus-TCP, the efficient way to remotely access a Twido through

an eWON is the Transparent Gateway function and not eVCOM.

In fact, Modbus Gateway is a kind of special case of the more

general VirtualCOM functionality.

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Mitsubishi RS232/485/LAN Serial Communication Control Uživatelský manuál Strana 19