User's Manual

Page 8 E2 Wireless I/O
1Chapter 1 – Introduction
1.1 Overview
The E2 range of I/O modules has been designed to provide standard “off-the-shelf”
telemetry functions, for an economic price. Telemetry is the transmission of data or
signals over a long distance via radio or twisted-pair wire cable.
Although the E2 Series is intended to be simple in its application, it provides many
sophisticated features, which will be explained in the following chapters.
This manual should be read carefully to ensure that the modules are configured and
installed to give reliable performance.
The E2 telemetry module replaces the earlier 105 and 905 E-series modules. It
provides on-board I/O via a front mounting 20-way connector and has provision for
extra expansion modules (ELPRO 115S or MODBUS devices) to be connected using a
standard RS485 serial connection.
The module can monitor the following types of signals
• Digital on/off signals - Contact Closure or Switch
• Analog continuously variable signals – Tank level, Motor speed, temperature, etc
• Pulsed signal - Frequency signal – Metering, accumulated total, rainfall, etc
• Internal Signals – Supply voltage, Supply failure, battery status, etc.
The modules monitor the input signals and transmit the values by radio or Ethernet
cabling to another module or modules that have been configured to receive this
information.
The E2 radio has been designed to meet the requirements of unlicensed operation for
remote monitoring and control of equipment. A radio licence is not required for the E2 in
many countries.
The E2 product will seamlessly operate with existing 905U wireless I/O modules the E3
products, which use the same basic hardware but extend the functionality with
additional interfaces including an LCD and multiple radio functionality.
The E2 operates on unlicensed radio channels in the 902-915MHz bands.
Input signals that are connected to the module are transmitted and appear as output
signals on other modules. A transmission occurs whenever a "change-of-state" occurs
on an input signal. A "change-of-state" of a digital or an internal digital input is a change
from "off" to "on" or vice-versa. A "change-of-state" for an analog input, internal analog
input or pulse input rate is a change in value of the signal of 3% (configurable from 0.8
to 75 %).
In addition to change-of-state messages, update messages are automatically
transmitted on a configurable time basis. This update ensures the integrity of the
system.