Robustel M1000 XP User Guide - Manual (Page 50)

Robustel GoRugged M1000 XP User Guide
RT_UG_M1000 XP_v.1.0.0
19.11.2013 49 / 57
Confidential
4.2.3 UDP Mode
The main difference between the TCP and UDP protocols is that TCP guarantees delivery of data by requiring the
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 XP 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
rd
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