User Manual

L.R. Nelson Corporation
One Sprinkler Lane
Peoria, IL 61615
OEM Manual
8602 Radio Module
- 6 -
Technical Information
EZ Pro Controller and Command Communication Protocol Definition
Version 0.9
L.R. Nelson Corporation
This document describes the serial link protocol and packet formats used for the
EZ Pro Radio system.
SYSTEM DESCRIPTION
The system is made up of two entities that require data communications over an
ISM band 2.4GHz FHSS (frequency hopping spread-spectrum) radio system. In
our case each entity of the system is a remote device and an irrigation controller
but can be extended to any system with serial communication capabilities. The
EZ Pro radio system is comprised of the EZ Pro Command (Remote) and the EZ
Pro Controller (Base.) See figure below.
Figure 1
To initiate a communications link between the remote device and base (such as
irrigation controller), the radios must first be initialized with an ID set; source and
destination. A matching ID set must be set on both ends in order for a connection
to take place. The ID set instructs each end of the system, the permission to
speak with only to the destination device.
In order for communication to take place, a connection must be established
between the two radio modules following a specific connection protocol. Once a
connection is made, a data pipe is created between the remote and base units.
Data transmitted by either side is packetized by the radio for RF transmission. In
order to stop data transmission, a "disconnect" packet is sent by one of the two
Base
Remote Radio
Radio
2.4GHz ISM FHSS
Serial Link
Serial Link