Robustel M1000 Pro V2 Guia do Utilizador descarregar pdf (Página 47)

Robustel GoRugged M1000 Pro V2 User Guide

RT_M1000 Pro V2_UG_v01.00 23.11.2012 46 / 49

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recipient to send an acknowledgement to the sender. UDP does not require this type of verification, making it

possible to offer faster delivery. UDP also allows you to unicast data to one IP, or multicast the data to a group of IP

addresses.

These traits make UDP mode especially well suited for message display applications.

1. If your cellular ISP offers a fixed public IP address after you connect to the cellular network, you can access the

gateway from a host PC that has a fixed public IP bidirectional.

2. If your cellular service provider offers a dynamic public IP address after you connect to the cellular network, you

can use the DDNS function to get a domain name from the domain name server for the gateway. Then you can

access the gateway from a host PC that has a fixed public IP bidirectional.

3. If gateway has no fixed public IP or domain name, then it can unicast data to one host unidirectional.

Note: M1000 Pro V2 supports unicast only.

4.2.4 Virtual COM Mode

One of the major conveniences of using Virtual COM mode is that it allows you to use Virtual COM software that was

written for pure serial communication applications. The Virtual COM driver intercepts data sent to the host’s COM

port, packs it into a TCP/IP packet, and then redirects it through the host’s Ethernet to the Internet. At the other end

of the connection, the gateway accepts the IP frame from the cellular network, unpacks the TCP/IP packet, and then

transparently sends the data through the serial port to the attached serial device.

We provide application notes to introduce how to work with 3

parties’ popular virtual com software, please contact

us to get more information.

Note:

Virtual COM software (COM port redirector) is a specialized software (often including device driver and user

application) that includes the underlying network software necessary to access networked device servers that provide

remote serial devices or modems.

The purpose of the redirector is to make the virtual COM port exhibit behavior that closely resembles that of a "real"

COM port, i.e., a COM port driver for local serial port hardware. A virtual COM port itself is a relatively simple

software mechanism that can be implemented by driver software similar to that of a conventional COM port driver.

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Robustel M1000 Pro V2 Guia do Utilizador Página 47