User guide

eWON 500-2001-4001-4002 User Guide - eWON Configuration
eWON 500®2001®4001®4002® Version 4_3_0 - User Guide - 10/5/05 - ©ACT'L sa - Page 29
4.3.3.2.3 MODBUS/TCP MODBUS/RTU Gateway
Although it is possible to use this technology to transfer almost any type of data through the virtual serial port, some protocols require special
handling for efficient operation. ModbusRTU is one of these protocols and VCOM technology does not applies well to that protocol.
For Modbus RTU communication it is recommended to use the MbsTcpCOM software and use the eWON as a ModbusTCP to ModbusRTU
gateway.
4.3.3.3 PC Virtual COM Port driver
There are different options for creating virtual serial ports on the PC side.
4.3.3.3.1 MbsTcpCOM
This software provided by ACT’L is used to create ONE virtual COM port on the PC, the virtual COM port must only be used by software that are
supposed to communicate on the PC serial port in ModbusRTU.
The ModbusRTU slave is actually connected to the eWON’s serial port.
The PC software believes it is talking directly to the device through its serial port while it actually "talks" to its virtual serial port that transfers all the
data to the eWON by actually translating every requests in ModbusTCP (without interpreting them).
This software is downloadable for free from http://www.ewon.biz
.
4.3.3.3.2 Serial/IP
Tactical Software provides this software: http://www.tactical-sw.com
This software is not for free. It can be purchased directly from the Tactical software website.
An 30 days-evaluation version is available for download from this site.
The software supports both RAW TCP and Telnet RFC 2217 modes and works on all Windows version from Windows 95 to Windows XP.
The software can create up to 256 virtual serial ports that communicate with multiple eWONs.
4.3.3.4 eWON VCOM Configuration
4.3.3.4.1 Introduction
All serial ports can be used for VCOM.
Depending of the eWON type, you have 1, 2 or 4 serial ports.
The COM1 is always the serial port 1 of the eWON.
The COM2 is always the MODEM port (even if there is no modem present on your eWON, the COM2 exist but is useless).
The COM3, if present, is linked to the serial port 2 (SER2), the full RS-232 port on eWON4002.
The COM4, if present, is linked to the serial port 3 (SER3).
As COM2 is the modem, it should only be used for debug purpose because when the port is used by VCOM it is not available to PPP or SMS
communication.