eWON General Reference Guide - Esco Drives & Automation

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General Reference GuideeWON ConfigurationAnother feature of the TELNET RFC2217 mode is its ability to change the modem line status. This means that the RTS/CTS, DTR, DCD (etc.)levels of the eWON’s physical port are reflected to the PC virtual port and vice-versa.This protocol is called TELNET RFC 2217 because it has been standardized and described in an RFC specification. It means that any clientsupporting the RFC2217 protocol can use the eWON as a virtual port server.3.3.2.1.4 MODBUS/TCP MODBUS/RTU GatewayAlthough it is possible to use this technology to transfer almost any type of data through the virtual serial port, some protocols require specialhandling for efficient operation. ModbusRTU is one of these protocols and VCOM technology does not apply well to that protocol. For ModbusRTU communication it is recommended to use the MbsTcpCOM software and use the eWON as a ModbusTCP to ModbusRTU gateway.3.3.2.2 PC Virtual COM Port driverThere are different options for creating virtual serial ports on the PC side.3.3.2.2.1 MbsTcpCOMThis software provided by eWON s.a. is used to create ONE virtual COM port on the PC, the virtual COM port must only be used by softwaresthat 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 that it is “talking” directly to the device throughits serial port while it actually "talks" to its virtual serial port that transfers all the data to the eWON by translating every requests into ModbusTCP(without interpreting them).This software is downloadable for free from http://www.ewon.biz.3.3.2.2.2 Serial/IPTactical Software provides this software: http://www.tactical-sw.comThis 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.3.3.2.3 eWON VCOM Configuration3.3.2.3.1 IntroductionAll serial ports can be used for VCOM.Depending on 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 exists 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 purposes because when the port is used by VCOM it is not available to PPP or SMScommunication.RG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 17
General Reference GuideeWON Configuration3.3.2.3.2 Web configurationYou get access to the COM1 (or COM2) VIRTUAL PORT CONFIGURATION page by following this path from the Main Menu navigation bar:Configuration/System Setup/General/Net services/Virtual Com :Figure 15: eWON Virtual COM port configuration pageYou may first choose the COM port you want to configure in the COM Port: scrolling menu. You can then define the following parameters:ControlPort TypeTCP PortPoll Signal IntervalDebugAlways accept new clientsInactivity TimeoutLine parametersHW ModeDescriptionIf Disabled is selected, then VCOM will not be used on this port.The PC will have to connect to that TCP/IP port to communicate through the eWON serial port.REM: if multiple VCOM are defined on the same eWON, they must all use a different TCP/IP port.This parameter is only used in TELNET RFC2217 mode. In that mode the eWON will scan the modem port forchanges in modem line input levels (CTS, DSR, DCD, RING) thus this parameters defines the scan rate. Thedefault value of 100msec should be fast enough for most applications.Activate the recording of debug info for VCOM. When activated, this function slows down the overallperfomance of the eWON.All debug info will be accessible in the Diagnostic->Real Time Log menu.When a PC is connected to the eWON, then a socket is opened by the PC to the eWON. If for example the PCsuddenly switches off, the eWON will not know that the socket should be closed, and when the PC will try toconnect again, the eWON will refuse the connection. This option is provided in order to avoid that situation;when checked, the eWON will always be ready for a new connection, and the new connection will replace theprevious connection. This means also that if one PC is connected to the VCOM port, and that another PC triesto connect with this option checked, the new PC connection will be accepted and the existing PC connectionwill be closed.There is another way to avoid that an unused but opened socket prevents access to the eWON (if theprevious option has NOT BEEN checked). If you set this option with a value different of 0, then the eWON willclose its VCOM socket if there is no communication for a given amount of time. If serial communication issupposed to occur all the time this option can be useful, but if silence in communication is expected, then thisoption will obviously not apply.Except for HW Mode, which is an “hardware parameter” (only configurable in the eWON), these parametersare only used when the port is configured in RAW TCP mode, because in TELNET RFC2217 mode the PCvirtual port will usually change them. In any case, this will define the initial or default values.Hardware Mode represents the hardware behavior of the serial link. Available values are :• HalfDuplex• FullDuplex with HardWare handshaking (default)• FullDuplex with NO handshakingREM: This mode cannot be controlled remotely by RFC 2217Table 7: eWON virtual COM port configuration controlsRG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 18
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