8
8
6.
INTRODUCTION
Many times a need is felt to upgrade software of a remotely situated device/machine, or
monitor its parameters, or receive warnings on malfunctioning to a remotely situated server. Taking
advantage of the large mobile networks and their supporting GPRS features, it is now possible to
connect devices in the field back to a central server simply and cost-effectively. Using wireless cellular
technology, serial devices such as PLC, Modbus, RFID scanners, data loggers, electricity meters,
pumps, valves, POS (Point-Of-Sales) terminals and such other equipments can be connected to a
central processing server without the requirement for cables to be installed. All you need is a device
which has a serial port, and WirelessCom/G10. Just configure and connect WirelessCom/G10 to your
device/machine and your device/machine would easily turn it into a device which can be accessed from
any remotely located server.
WirelessCOM/G10 is exactly what its name says; it is a wireless COM port. When
WirelessCOM/G10 is connected to any equipment with COM/RS-232 ports, it just replaces the
physical cable (RS232) connection by wireless GSM network. This means, the length of RS232 cable
would be as long as a GSM network. Thus, as far as a GSM network is available, this device will be
accessible from any part of the world. In simple words, WirelessCom acts as a bridge between serial
port and GPRS. All the information coming through GPRS/CSD is sent to serial port and all the
information coming on serial port is sent to GPRS/CSD. In short there is a transparent connection
between WirelessCom and the server/PC (for example) without any physical limits.
WirelessCom is basically an intelligent pre-programmed modem for making GPRS/CSD
connections and handle the exceptions arising during the process of making connection. Thus you
don’t need an external microcontroller to control WirelessCom using AT commands. All you need is to
configure WirelessCom (the configuration parameters are explained in later sections) and it will
automatically make connections using the configured bearer (GPRS/CSD). If anything goes wrong, for
example GPRS activation failed/CSD call could not be established/GPRS connection could not be
Physical contact
Figure 6.1: RS232 connections
6.1 a)
INTERNET/
CSD call
Virtual contact
6.1 b)
