![background image](http://html1.mh-extra.com/html/omega/iserver-microserver-eis-2b/iserver-microserver-eis-2b_user-manual_4061530044.webp)
38
4.10 Remote Access (Tunneling)
To "tunnel", in this context, is to transmit data between two points through a private conduit
on a shared or public network. The network could be an Ethernet LAN, a WAN, or the
Internet. The iServer allows for a connection between a serial device and a PC, or between
two serial devices, using an existing network rather than dedicated wiring.
Today, there are number of serial devices like sensors, gauges, PLCs, card readers, security
alarms, barcode scanners, data loggers, video cameras, ATM machines, time & attendance
terminals, medical lab equipments, electronic signboards, and many others that are directly
connected to PCs via their serial ports. These devices can be attached to shared Ethernet
networks (TCP/IP protocol) and get accessed, controlled, and managed remotely using the
iServer products. Any two iServer’s can talk to each other over the Ethernet LAN, WAN, and
Internet using TCP/IP protocol. Therefore, the connected serial devices to iServer’s can also
communicate with each other back and forth over these networks. This characteristic is
called Tunneling and it’s illustrated in
Figures 4.23 and 4.24
.
Figure 4.23 Serial Tunneling
Figure 4.24 Device-to-Device Communication
In order to use this Tunneling feature, some settings are required within the local and
remote iServer’s.