ELPRO 905U, 905U-G, 905U-C, 905U-K, 905U-D User Manual

For 905U-C, 905U-G, 905U-K and 905U-D products,

refer to separate User Manuals

ELPRO Technologies Pty Ltd, 9/12 Billabong Street, Stafford Q 4053, Australia.

Tel: [phone] Fax: [phone] Email: [email protected]

Web: www.elprotech.com

User Manual

905U Wireless I/O Module

105S Serial I/O Module

also includes 105U 5W Wireless I/O range for licensed

frequencies in the 380 – 520 MHz band

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 2 © January 2011

Thank you for your selection of the 905U / 105S module for your I/O needs. We trust it will give you

many years of valuable service.

ATTENTION!

Incorrect termination of supply wires may

cause internal damage a nd will void warranty.

To ensure this product enjoys a long life,

double check ALL your connections with

the user’s manual

before turning the power on.

Caution!

For continued protection against risk of fire, replace th e module fuse F1 only with

the same type and rating.

CAUTION:

To comply with FCC RF Exposure requirements in section 1.1310 of the FCC Rules, antennas used
with this device must be installed to provide a separation distance of at least 33 cm from all persons
to satisfy RF exposure compliance.

DO NOT:

• operate the transmitter when someone is within 33 cm of the antenna

• operate the transmitter unless all RF connectors are secure and any open connectors are properly

terminated.

• operate the equipment near electrical blasting caps or in an explosive atmosphere
All equipment must be properly grounded for safe operations. All equipment should be serviced only

by a qualified technician.

Contents

man_905-105_2.16 Page 3

FCC Notice: 905U Wireless I/O Module

This user’s manual is for the ELPRO 905U wireless I/O module. This device complies with Part

15.247 of the FCC Rules.
Operation is subject to the following two conditions:

1) This device may not cause harmful interference and

2) This device must accept any interference received, including interference that may cause

undesired operation.

NOTE: This equipment is suitable for use in Class I Division 2 groups A, B C and D or non-hazardous
locations only

This device must be operated as supplied by ELPRO Technologies. Any changes or modifications
made to the device without the written consent of ELPRO Technologies may void the user’s authority
to operate the device.

End user products that have this device embedded must be installed by experienc ed radio and antenna
personnel, or supplied with non-standard antenna connectors, and antennas available from vendors
specified by ELPRO Technologies. Please contact ELPRO Technologies for end user antenna and
connector recommendations.

Notices: Safety

Exposure to RF energy is an important safety consideration. The FCC has adopted a safety standar d for
human exposure to radio frequency electromagnetic energy emitted by FCC regulated equipment as a
result of its actions in Docket 93-62 and OET Bulletin 65 Edition 97-01.

FCC Notice: 105U Wireless I/O Module

Part 15 – This device has been tested and found to comply with the limits for a Class B digital

device, pursuant to Part15 of the FCC rules (Code of Federal Regulations 47CFR Part 15).
Operation is subject to the condition that this device does not cause harmful interference.

Part 90 – This device has been type accepted for operation by the FCC in accordance with Part90 of

the FCC rules (47CFR Part 90). See the label on the uni t for the specific FCC ID and any
other certification designations.

Industry Canada: 105U Wireless I/O Module

RSS-119 - This device has been type accepted for operation by Industry Canada in acc ordance with

RSS-119 of the Industry Canada rules. See the label on the unit for the specific Industry
Canada certification number and any other certification designations.

Notice Any changes or modifications not expressly approved by ELPRO Technologies P/L could

void the user’s authority to operate this equipment.

To operate this equipment legally the user must obtain a radio operating license from the
government agency. This is done so the government can coordinate radio users in order to
minimize interference.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 4 © January 2011

Important Notice

ELPRO products are designed to be used in industrial environments, by experienced industrial
engineering personnel with adequate knowledge of safety design considerations.

ELPRO radio products are used on unprotected license-free radio bands with radio noise and
interference. The products are designed to operate in the presence of noise and interference, however
in an extreme case, radio noise and interference could cause product operation delays or operation
failure. Like all industrial electronic products, ELPRO products can fail in a variet y of modes due to
misuse, age, or malfunction. We recommend that users and designers design systems using design
techniques intended to prevent personal injury or damage during product operation, and provide
failure tolerant systems to prevent personal inj ury or damage in the event of product failur e. Designers
must warn users of the equipment or systems if adequate protection against failure has not been
included in the system design. Designers must include this Important Notice in operating procedures
and system manuals.

These products should not be used in non-industrial applications, or life-support systems, without
consulting ELPRO Technologies first.

1. For 905U modules, a radio licence is not required in many countries, provided the module is
installed using the antenna and equipment configuration complying with the country’s
regulations.. Check with your local distributor for further information on regulations.

2. For 905U modules, operation is authorised by the radio frequency regulatory authori ty in your
country on a non-protection basis. Although all care is taken in the design of these units, there
is no responsibility taken for sources of external interference. The 905U intelligent
communications protocol aims to correct communication errors due to interference and to
retransmit the required output conditions regularly. However some delay in the operation of
outputs may occur during periods of interference. Systems should be designed to be tolerant of
these delays.

3. To avoid the risk of electrocution, the antenna, antenna cable, serial cables and all terminals of
the 905U/105S module should be electrically protected. To provide maximum surge and
lightning protection, the module should be connected to a suitable earth and the antenna,
antenna cable, serial cables and the module should be installed as recommended in the
Installation Guide.

4. To avoid accidents during maintenance or adjustment of remotely controlled equipment, all
equipment should be first disconnected from the 905U/105S module during these adjustments.
Equipment should carry clear markings to indicate remote or automatic operation. E.g. "This
equipment is remotely controlled and may start without warning. Isolate at the switchboard
before attempting adjustments."

5. The 905U/105S module is not suitable for use in explosive environments without additional
protection. These modules are approved for use in Class 1 Division 2 areas in North America.

Contents

man_905-105_2.16 Page 5

Limited Lifetime Warranty, Disclaimer and Limitation of Remedies

ELPRO products are warranted to be free from manufacturing defects for the “serviceable lifetime” of
the product. The “serviceable lifetime” is limited to the availability of electronic components. If the
serviceable life is reached in less than three years following the original purchase from ELPRO,
ELPRO will replace the product with an equivalent product if an equivalent product is available.

This warranty does not extend to:

- failures caused by the operation of the equipment outside the particular product's specification, or

- use of the module not in accordance with this User Manual, or

- abuse, misuse, neglect or damage by external causes, or

- repairs, alterations, or modifications undertaken other than by an authorized Service Agent.

ELPRO’s liability under this warranty is limited to the replacement or repair of the product. This
warranty is in lieu of and exclusive of all other warranties. This warranty does not indemnify the
purchaser of products for any consequential claim for damages or loss of operations or profits and
ELPRO is not liable for any consequential damages or loss of operations or profits resulti ng from the
use of these products. ELPRO is not liable for damages, losses, costs, injury or harm incurred as a
consequence of any representations, warranties or conditions made by ELPRO or its representatives or by
any other party, except as expressed solely in this document..

How to Use This Manual

To receive the maximum benefit from your 905U/105S product, please read the Introduction,
Installation and Operation chapters of this manual thoroughly before putting the product to work.

Chapter Four Configuration expl ains how to configure the modules using the Configuration Software
available.

Chapter Five Specifications details the features of the product and lists the standards to which the
product is approved.

Chapter Six Troubleshooting will help if your system has problems and Chapter Seven specifies the
Warranty and Service conditions.

The foldout sheet Installation Guide is an installation drawing appropriate for most applications.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 6 © January 2011

CONTENTS

CHAPTER ONE INTRODUCTION .................................................................................................. 8

1.1 GENERAL ................................................................................................................................... 8

CHAPTER TWO INSTALLATION ................................................................................................ 11

2.1 GENERAL ................................................................................................................................. 11

2.2 ANTENNA INSTALLATION (905U & 105U UNITS ONLY) ............................................................ 11

2.2.1 Dipole and Collinear antennas. ........................................................................................... 13

2.2.2 Yagi antennas. ..................................................................................................................... 13

2.3 POWER SUPPLY ........................................................................................................................ 15

2.3.1 AC Supply ........................................................................................................................... 15

2.3.2 DC Supply ........................................................................................................................... 15

2.3.3 Solar Supply ........................................................................................................................ 16

2.3.4 Multiple Modules ................................................................................................................ 17

2.3.5 24V Regulated Supply ........................................................................................................ 18

2.4 INPUT / OUTPUT ....................................................................................................................... 18

2.4.1 Digital Inputs (905-1, 905-2 and 905-4) ............................................................................. 18

2.4.2 Digital Outputs (905-1) ....................................................................................................... 18

2.4.3 Digital Outputs (905-2, 905-3 and 905-4) .......................................................................... 19

2.4.4 Analog Inputs (905-1 and 905-2) ........................................................................................ 19

2.4.5 Analog Outputs (905-1 and 905-3) ..................................................................................... 21

2.4.6 Pulse Input (905-1) ............................................................................................................ 23

2.4.7 Pulse Inputs (905-2 and 905-4) .......................................................................................... 23

2.4.8 Pulse Output (905-1) ........................................................................................................... 24

2.4.9 Pulse Output (905-3 and 905-4) .......................................................................................... 24

COUNT+ ........................................................................................................................................ 24

2.4.10 RS232 Serial Port ............................................................................................................ 25

2.4.11 RS485 Serial Port ............................................................................................................ 25

2.4.12 Connecting 105S Modules to 905U Modules ................................................................. 26

CHAPTER THREE OPERATION .................................................................................................. 27

3.1 POWER-UP AND NORMAL OPERATION ...................................................................................... 27

3.1.1 Communications ................................................................................................................. 27

3.1.2 Change of state conditions .................................................................................................. 29

3.1.3 Analog Set-points ................................................................................................................ 32

3.1.4 Start-up Poll ........................................................................................................................ 32

3.1.5 Communications Failure (CF) ............................................................................................ 32

3.1.6 Resetting Outputs ................................................................................................................ 33

3.2 SYSTEM DESIGN TIPS ............................................................................................................... 33

3.2.1 System Dynamics ................................................................................................................ 33

3.2.2 Radio Channel Capacity ..................................................................................................... 33

3.2.3 Radio Path Reliability ......................................................................................................... 34

3.2.4 Design for Failures .............................................................................................................. 34

Contents

man_905-105_2.16 Page 7

3.2.5 Indicating a Communications Problem ............................................................................... 35

3.2.6 Testing and Commissioning................................................................................................ 36

3.3 SECURITY CONSIDERATIONS .................................................................................................... 36

CHAPTER FOUR CONFIGURATION .......................................................................................... 37

4.1 INTRODUCTION ........................................................................................................................ 37

4.2 EASY CONFIGURATION USING DEFAULT SETTINGS ................................................................. 38

4.3 CONFIGURATION SOFTWARE .................................................................................................... 40

4.3.1 Hardware and Software Requirements ............................................................................... 40

4.3.2 Program Operation .............................................................................................................. 40

4.3.4 Loading Configuration from a Module ............................................................................... 52

4.3.5 Modifying and Archiving Configuration Files ................................................................... 52

4.3.6 Print Options ....................................................................................................................... 53

4.3.7 Security ............................................................................................................................... 53

4.3.8 Using 105S Modules ........................................................................................................... 55

CHAPTER FIVE SPECIFICATIONS ............................................................................................. 58

5.1 DIMENSIONED DRAWING ......................................................................................................... 61

CHAPTER SIX TROUBLESHOOTING ....................................................................................... 63

6.1 DIAGNOSTICS CHART ............................................................................................................... 63

6.2 SELF TEST FUNCTIONS ............................................................................................................. 64

6.2.1 Input to Output Reflection (905U-1/105S-1 only) ............................................................. 64

6.2.2 Radio Testing using Tone Reversals (105U/905U modules only) ..................................... 64

6.2.3 Diagnostics menu ................................................................................................................ 64

6.2.4 Comms Logging .................................................................................................................. 71

6.3 RADIO PATH TESTING .............................................................................................................. 73

CHAPTER SEVEN WARRANTY & SERVICE ............................................................................ 75

APPENDIX A SYSTEM EXAMPLE ........................................................................................... 76

APPENDIX B TERMINAL LAYOUTS .......................................................................................... 82

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 8 © January 2011

Chapter One INTRODUCTION

1.1 General

The 905U, 105U & 105S range of I/O modules has been designed to provide standard “off-the-shelf”
telemetry functions, for an economical price. Telemetry is the transmission of signals over a long
distance via a medium such as radio or twisted-pair wire. Although the 905U/105S is intended to be
simple in its application, it also provides many sophisticated features. This manual should be read
carefully to ensure that the modules are configured and installed to give reliable performance.

The unit can monitor and control the following types of signals:
Digital on/off signals
Example outputs - motor run, siren on

Example inputs - motor fault, tank overflow, intruder alarm
Analog continuously variable signals (0-20mA)
Example outputs - tank level indication, required motor speed

Example inputs - measured tank level, actual motor speed
Pulse frequency signals
Examples - electricity metering, fluid flow
Internal Status signals
Examples - analog battery voltage, power status, solar panel status and low battery

status.

The unit will monitor the input signals and transmit the signal information by radio or RS485 twisted
pair to another module or modules. At the remote unit, the signals will be reproduced as digital,
analog or pulse output signals. The modules also provide analog set points, so that a digital output may
be configured to turn on and off depending on the value of an analog input. The pulse I/O tr ansmits an
accumulated value and the pulses are reliably recreated at the remote unit regardless of ‘missed’
transmissions. The actual pulse rate is also calculated and is available as a remote analog output.

This manual covers the 905U, 105U and 105S modules. We have provided a summary on all products
available in the range, below.

• 905U-1, 905U-2, 905U-3 and 905U-4 modules have radio and serial communications. The

modules differ only in their input/output (I/O) design, and are compatible, i.e. they can be used to
communicate signals to each other in the same network. The 905U has a frequency hopping spread
spectrum 900MHz radio which is license-free in many countries.

• 105U-1, 105U-2, 105U-3 and 105U-4 modules are similar to the 905U range, except they have a

fixed frequency radio in the 380 – 520MHz band (configurable 0.5 – 5W RF power), suitable for

Chapter One Introduction

man_905-105_2.16 Page 9

licensed radio channels in most countries.

• 105S-1, 105S-2, 105S-3 and 105S-4 modules have only serial communications. All other

specifications are as per the 905U-1, 2, 3 & 4 modules. The 105S modules are compatible with
905U modules. 105S modules may be used for serial I/O applications, or as I/O expansion for
905U modules.

• The 905U-C and 905U-G modules provides an interface between host devices such as PLC’s or

SCADA computers, and a wireless I/O system comprising 905U modules. The 905U-C and 905U­G allows 905U modules to act as remote wireless I/O for the host devices. For more information,
refer to the 905U-C or 905U-G User Manual.

The 905U radio has been designed to meet the requirements of unlicensed operation for remote
monitoring and control of equipment. That is, a radio licence is not required for the 905U modules in
many countries. See Chapter Five Specifications for details. The 105U radio is suitable for fixed
frequency licensed channels in the 380-520MHz band - that is, a radio license is required to use the
105U products, but not the 905U products.

I/O Types

905U-1

105U-1

105S-1

905U-2

105U-2

105S-2

905U-3

105U-3

105S-3

905U-4

105U-4

105S-4

Radio









Serial

       

Digital
Inputs (DI)

4 4 4 to 16

Digital
Outputs (DO)

4 (relay) 1 (FET) 8 (FET) 4 to 16 (FET)

Analog
Inputs (AI)

2 (4-20mA) 6 (0-20mA)

Analog
Outputs (AO)

2 (4-20mA) 8 (0-20mA)

Pulse Inputs
(PI)

1 (100Hz) 4 (1x1KHz,

3x100Hz)

4 (1x1KHz,

3x100Hz)

Pulse
Outputs (PO)

1 (100Hz) 4 (100 Hz) 4 (100 Hz)

Comments

PI is DI 1. PO is

separate to DO.

PI’s are the same

as DI’s.

PO’s are the same

as DO’s .

PI/ PO’s are the

same as DI/ DO’s.

Note regarding -4 modules. The 905U/105S-4 has a total of 20 digital I/O. Four are fixed inputs
(also PI’s) and four are fixed outputs (also PO’s). The other 12 are selectable individually as DI or
DO. The I/O range can vary from 16DI + 4DO to 4DI + 16DO or any combination in between.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 10 © January 2011

Input signals connected to a module are transmitted to another module and appear as output signals.
These input signals may also be configured to appear as “inverted” signals on the output. A
transmission occurs whenever a "change-of-state" occurs on an input signal. A "change-of-state" of a
digital or digital internal 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 regular
basis. The time period may be configured by the user for each input. This update ensures the integrity
of the system.

Pulse inputs are accumulated as a pulse count and the accumulated pulse count is transmitted regularly
according to the configured update time.

The I/O modules transmit the input/output data as a data frame using radio or serial RS485 as the
communications medium. The data frame includes the "address" of the transmitting module and the
receiving module, so that each transmitted message is acted on only by t he correct receivi ng unit. Each
transmitted message also includes error checking to ensure that no corruption of the data frame has
occurred due to noise or interference. The module with the correct receiving "address" will
acknowledge the message with a return transmission. If the original module does not receive a correct
acknowledgement to a transmission, it will retry up to five times before setting the communications fail
status of that path. In critical paths , this status can be reflected on an output on the module for alert
purposes. The module will continue to try to establish communications and retry, if required, each time
an update or change-of-state occurs.

A system may be a complex network or a simple pair of modules. An easy-to-use configuration
procedure allows the user to specify any output destination for each input.

The maximum number of modules in one system is 95 modules communicating by radio. Each of
these modules may have up to 31 other modules connected by RS485 twisted pair. Modules may
communicate by radio only, by RS485 only or by both RS485 and radio. Any input signal at any
module may be configured to appear at any output on any module in the entire system.

Systems with a 905U-C or 905U-G module and host device can have more than 95 radio modules.
Modules can be used as repeaters to re-transmit messages on to the destination module. Repeaters can

repeat messages on the radio channel, or from the radio channel to the serial channel (and serial to
radio). Up to five repeater addresses may be configured for each input-to-output link.

The units may be configured by using a PC connected to the RS232 port. The default configuration
and software configuration is defined in Section 4 Configuration.

Note: In this manual, reference to the 905U Wireless I/O units also relates to the 105U
Wireless I/O units.

Chapter Two Installation

man_905-105_2.16 Page 11

Chapter Two INSTALLATION

2.1 General

The 905U/105S module is housed in a rugged aluminium case, suitable for DIN-rail mounting.
Terminals are suitable for cables up to 2.5 sqmm in size.

All connections to the module should be SELV only. Normal 110/220/240V mains supply should
not be connected to any input terminal of the module. Refer to Section 2.3 Power Supply.

Each module should be effectively earthed/grounded via a "GND" terminal on the module - this

is to ensure that the surge protection circuits inside the module are effective. The earth/ground wire
should be connected to the same earth/ground point as the enclosure “earth” and the antenna mast
“earth”.

Before installing a new system, it is preferable to bench test the complete system. Configuration
problems are easier to re cognise when the system units are adjacent. Following installation, the most
common problem is poor communications on the radio channel or the serial channel. For radio
modules, problems are caused by incorrectly installed antennas, or radio interference on the same
channel, or the radio path being inadequate. If the radio path is a problem (i.e. path too long, or
obstructions in the way), then higher performance antennas or a higher mounting point for the antenna
may fix the problem. Alternately, use an intermediate module as a repeater.

For serial modules, poorly installed serial cable, or interference on the serial cable is a common
problem.

The foldout sheet Installation Guide provides an installation drawing appropriate to most applications.
Refer to Appendix B of this manual for terminal layout drawings of the modules.

2.2 Antenna Installation (905U & 105U units only)

The 905U module will operate reliably over large distances. The distance which may be reliably
achieved will vary with each application - depending on the type and location of antennas, the degree
of radio interference, and obstructions (such as hills or trees) to the radio path. Typical reliable
distances are :

USA/Canada 15 miles 6dB net gain antenna configuration permitted (4W ERP)
Australia/NZ 12 km unity gain antenna configuration (1W ERP)
Longer distances can be achieved if one antenna is mounted on top of a hill.

To achieve the maximum transmission distance, the antennas should be raised above intermediate
obstructions so the radio path is true “line of sight”. Because of the curvature of the earth, the
antennas will need to be elevated at least 15 feet (5 metres) above ground for paths greater than 3 miles
(5 km). The modules will operate reliably with some obstruction of the radio path, although the
reliable distance will be reduced. Obstructions which are close to either antenna will have more of a
blocking affect than obstructions in the middle of the r adio path. For exa mple, a group of trees around

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 12 © January 2011

the antenna is a larger obstruction than a group of trees further away from the antenna. The 905U
modules provide a test feature which displays the radio signal strength.

Line-of-sight paths are only necessary to obtain the maximum range. Obstructions will reduce the
range however, but may not prevent a reliable path. A larger amount of obstruction can be tolerated for
shorter distances. For very short distances, it is possible to mount the antennas i nside buildings. An
obstructed path requires testing to determine if the path will be reliable - refer the section 6 of this
manual.

Longer distances can be achieved using the licensed 105U units, because they use a lower frequency
and licensed conditions generally allow a higher RF power to be used.

Where it is not possible to achieve reliable communications between two modules, then a third module
may be used to receive the message and re-transmit it. This module is referred to as a repeater. This
module may also have input/output (I/O) signals connected to it and form part of the I/O network ­refer to Chapter 4 Configuration of this manual.

An antenna should be connected to the module via 50 ohm coaxial cable (eg RG58, RG213 or Cellfoil)
terminated with a male SMA coaxial connector. The higher the antenna is mounted, the greater the
transmission range will be, however as the length of coaxial cable increases so do cable losses. For
use on unlicensed frequency channels, there are several types of antennas suitable for use. It is
important antenna are chosen carefully to avoid contravening the maximum power limit on the
unlicensed channel - if in doubt refer to an authorised service provider.

The net gain of an antenna/cable configuration is the gain of the antenna (in dBi) less the loss in the
coaxial cable (in dB).

The maximum net gain of the antenna/cable configuration permitted for 905U is

Country Max. gain (dB)

USA / Canada 6
Australia / New Zealand 0
The gains and losses of typical antennas for 905U are

Standard Antennas Gain (dB) Elpro Part Nos.

Dipole with integral 15’ cable 0 CFD890EL
5dBi Collinear (3dBd) 5 SG900EL
8dBi Collinear (6dBd) 8 SG900-6
6 element Yagi 10 YU6/900
9 element Yagi 12 YU9/900
16 element Yagi 15 YU16/900

Cable type Loss (dB per 30 ft / 10 m)

RG58 -5
RG213 -2.5

Cellfoil -3

Chapter Two Installation

man_905-105_2.16 Page 13

The net gain of the antenna/cable configuration i s determined by adding the antenna gain and t he cable
loss. For example, a 6 element Yagi with 70 feet (20 metres) of Cellfoil has a net gain of 4dB (10dB –
6dB).

For information on antennas and cables for the 105U licensed products, please refer to ELPRO or an
authorized distributor.

Connections between the antenna and coaxial cable should be carefully taped to prevent ingress of
moisture. Moisture ingress in the coaxial cable is a common cause for problems with radio systems, as
it greatly increases the radio losses. We recommend that the connection be taped, firstly with a layer of
PVC Tape, then with a vulcanising tape such as “3M 23 tape”, and finally with another layer of PVC
UV Stabilised insulating tape. The first layer of tape allows the joint to be easily inspected when
trouble shooting as the vulcanising seal can be easily removed.

Where antennas are mounted on elevated masts, the masts should be effectively earthed to avoid
lightning surges. For high lightning risk areas, surge suppression devices between the module and the
antenna are recommended. If the antenna is not already shielded from lightning strike by an adjacent
earthed structure, a
lightning rod may be
installed above the antenna
to provide shielding.

2.2.1 Dipole and

Collinear antennas.

A collinear antenna
transmits the same amount
of radio power in all
directions - as such that
are easy to install and use.
The dipole antenna with
integral 15 feet cable does
not require any additional
coaxial cable, however a
cable must be used with the
collinear antennas.

Collinear and dipole
antennas should be
mounted vertically,
preferably 1 metre away
from a wall or mast to
obtain maximum range.

2.2.2 Yagi antennas.

A Yagi antenna provides high gain in the forward direc tion, but lower gain in other directions. This
may be used to compensate for coaxial cable loss for installations with marginal radio path.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 14 © January 2011

The Yagi gain also acts on the receiver, so adding Yagi antennas at both ends of a link provides a
double improvement.

Yagi antennas are directional. That is, they have positive gain to the front of the antenna , but negative
gain in other directions. Hence Yagi antennas should be ins talled with the centra l beam horizontal and
must be pointed exactly in the direction of trans mission to benefit from the gain of the antenna. The
Yagi antennas may be installed with the elements in a vertical plane (vertically polarised) or in a
horizontal plane (horizontally polarised). For a two station instal lation, with both modules using Yagi
antennas, horizontal polarisation is recommended. If there are more than two stations transmitting to a
common station, then the Yagi antennas should have vertical polarisation, and the common (or
“central” station should have a collinear (non-directional) antenna.

Note that Yagi antennas normally
have a drain hole on the folded
element - the drain hole should be
located on the bottom of the
installed antenna.

905U

Antenna installed
with drain hole s
down

Coax feed looped
at connection

90

o

Protected area -
approx 45 deg angle

to vertical

Chapter Two Installation

man_905-105_2.16 Page 15

2.3 Power Supply

The 905U/105S power supply is a switch-mode design which will accept either AC or DC supply. The
module may also be powered from a solar panel without an external solar regulator.

The module accepts supply voltages in the following ranges :
12 - 24 volts AC RMS or 15 - 30 volts DC at the “supply” terminals, or

11.5 -15 volts DC at the “battery” terminals.

The power supply should be rated at 1.5 Amps and be CSA Certified Class 2. For use in Class 1 Div 2
explosive areas, the power supply must be approved for Class 1 Div 2 use.

Note: Connect module to the same ground/earth point as the antenna mounting to avoid differences in
earth potential during voltage surges. The modules needs an earth connection for the internal surge
protection to be effective.

For licensed 105U units with RF power above 2W, the unit needs to be powered from the 12V
“Battery” terminals with a power supply of at least 2A rating. Alternately, the unit can be
powered via the SUP1 / SUP2 terminals, provided a backup battery is connected to the
“Battery” terminals to supply the inrush current for the radio transmitter. This is not required
for units with radio power less than 2W.

2.3.1 AC Supply

The AC supply is connected to the "SUP1" and "SUP2" terminals as shown below.

The AC supply should be "floating" relative to earth. AC transformers with grounded/earthed
secondary windings should not be used.

2.3.2 DC Supply

For DC supplies, the positive lead is connected to "SUP1" and the negative to "GND". The positive
side of the supply must not be connected to earth. The DC supply may be a floating supply or

SUP1

SUP2
GND
SOL

12 – 24 VAC

Power

Supply
AC Out

BAT+

GND

- +

905U

Optional Battery

Fuse 2A

Optional Battery

Fuse 2A

_

+

SUP1

SUP2
GND
SOL

Power

Supply
DC Out

BAT+

GND

- +

905U

15 – 30 VDC

>17V if battery

is used

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 16 © January 2011

negatively grounded.
The module may also be powered from an external 11.5 - 15 VDC battery supply without the need for a

"normal" supply connected to "SUP1". This external battery supply is connected to "BAT+" and
"GND" terminals. The positive lead of the external supply should be protected by a 2A fuse.

Upon failure of the normal supply, the module may continue to operate for several hours from a backup
battery. The module includes battery charging circuits for charging up to a 12 AHr sealed lead acid
battery. The battery is connected to the "BAT+" (positive) and "GND" (negative) terminals. The
positive lead from the battery should be protected with a 2A fuse, installed as near to the battery
terminal as possible. On return of main supply, the unit will switch back to mains operation, and
recharge the battery. To provide adequate current to r echar ge the ba ckup batt ery, a n AC supply of 15V
minimum or a DC supply of 17V minimum must be used. Typically, a 6 AHr battery will supply the
905U for 1 - 3 days, depending on I/O loads.

2.3.3 Solar Supply

The power supply also includes a 12 V solar regulator for connecting 12V solar panels of up to 30W,
and solar batteries of up to 100AHr. The unit must not be powered from a solar panel without a
battery. A 20W solar panel is sufficient for most solar applications. The size of the solar battery
required depends on the I/O used. Batteries are sized for a number of sunless days with 50% battery
capacity remaining as follows:
No. of sunless days = Battery capacity (AHr) x 0.5
Module load (A) x 1.2 x 24

The Module load depends on the I/O connected and can be calculated as follows:
Module Load(mA) = (85 for 105U/905U or 45 for 105S) + (10 x No. of active DI’s) +
(25 x No. of active DO’s) + (2 x Analog loop load).

The analog loop load is the total signal current for the AI’s and AO’s which are powered from the
internal 24V supply. Externally powered loops are not included in this.

_

+

SUP1

SUP2
GND
SOL

BAT+

GND

-

+

905U

Solar Battery

Fuse 2A

Solar Panel

_

+

SUP1
SUP2
GND
SOL

Power
Supply
DC Out

BAT+

GND

905U

11.5 – 15 VDC

Fuse 2A

Chapter Two Installation

man_905-105_2.16 Page 17

The solar panel is connected to the "SOL" (positive) and "GND" (negative) terminals and the battery
connected to the "BAT+" (positive) and "GND" (negative) terminals. Solar panels must be installed
and connected as per the panel manufacturer's instructions. The positive lead of the battery should be
protected by a 2A fuse installed as near as possible to the battery terminal.

Where a panel larger than 30W is required, an external solar regulator should be used.
For maintenance, disconnect the solar panel first before disconnecting the battery.

2.3.4 Multiple Modules

Where more than one module is installed at the one location, a shared power supply and battery may
be used, provided the total load does not exceed the power supply.

The internal power supply of the module can supply a maximum 12V load of 700mA. In order to
achieve this, the input power supply must be above 15VAC or 17VDC. Using these figures, it can be
determined whether there is enough supply for more than one module - allow 100mA for
recharging a battery.

For example, assume there is a 905U-1 module and a 105S-1 module at the same location. The total
I/O at the location is 3 analog inputs, 6 digital inputs and 4 digital outputs. The total load will be :-

TYPE OF LOAD LOAD mA

905U-01 quiescent 85
105S-01 quiescent 45
6 DI @ 10 mA 60
3 AI @ 20mA x 2 120
4 DO @ 25mA 100
Battery charging 100
TOTAL 510

So both modules could be powered from one power supply and one battery, provided the external
supply voltage is more than 15VAC or 17VDC.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 18 © January 2011

2.3.5 24V Regulated Supply

Each module provides a 24V DC regulated supply for analog loop power, except for 905U-4/105S-4.
The supply is rated at 150mA, and should only be used for powering analog loops.

2.4 Input / Output

2.4.1 Digital Inputs (905-1, 905-2 and 905-4)

The ”-1” and ”-2” modules each provide four digital inputs with 5000 volt opto-isolation, and the ”-4”
provides 4 to 16 inputs with 3000 volt surge protection. All inputs are suitable for voltage free contacts
(such as mechanical switches) or NPN transistor devices (such as electronic proximity switches). PNP
transistor devices are not suitable. Contact wetting current of approximately 5mA is provided to
maintain reliable operation of driving relays.

Each digital input is connected between the appropriate "DI" terminal and common "COM". Each
digital input circuit includes a LED indicator which is lit when the digital input is active, that is, when
the input circuit is closed. Pr ovided the resistance of the switching device is less than 200 ohms, the
device will be able to activate the digital input.

For pulse inputs, refer to Section 2.4.6.

2.4.2 Digital Outputs (905-1)

The ”-1” module provides four normally open voltage-free relay contacts, rated at AC 50V/5A, DC
30V/2A, 20V/5A. These outputs may be used to directly control low-powered equipment, or to power
larger relays for higher powered equipment. When driving inductive loads such as AC relays, good
installation should include capacitors (e.g. 10nf 250V) across the external circuit to prevent arcing
across the relay contacts. For DC inductive loads, flyback diodes should be used across DC relays.

+

_

DI 1

DI 4
COM

905U

Voltage-free
contact input

Transistor
input

V+

V-

_

+

DO 1

DO 2

905U

Max 50VAC

5A

AC

Load

DC

Load

Max 30VDC

2A

Chapter Two Installation

man_905-105_2.16 Page 19

Digital outputs may be configured to individually turn off if no command message is received to that
output for a certain period. This feature provides an intelligent watch dog for each output, so that a
communications failure at a transmitting site causes the output to revert to a known state. See section

4.4 Changing User Options for further details.

The output circuit is connected to the appropriate pair of "DO" terminals. Each digital output circuit
includes a LED indicator which is lit when the digital output is active.

2.4.3 Digital Outputs (905-2, 905-3 and 905-4)

The digital outputs on the “-2”, “-3” and “-4” modules are transistor swit ched DC signals, FET output
to common rated at 30VDC 500 mA. The ”-2” provides one digital output; the ”-3” provides eight
digital outputs and the ”-4” provides 4 – 16 output s. The first four DO’s on the ”-3” and ”-4” modules
are also the pulse outputs - that is, the first four DO's can be either di gital outputs or pulse outputs.
The function of each of these outputs may be configured individually. For a description of pulse
outputs, refer to Section 2.4.7.

Digital outputs may be configured to individually turn off if no command message is received to that
output for a certain period. This feature provides an intelligent watch dog for each output, so that a
communications failure at a transmitting site causes the output to revert to a known state. See Chapter
4 Configuration for further details.

The output circuit is connected to the appropriate pai r of "DO" terminals. Each digital output circuit
includes a LED indicator which is lit when the digital output is active.

2.4.4 Analog Inputs (905-1 and 905-2)

The ”-1” module provides two 4 - 20 mA DC analog inputs for connecting to instrument transduc ers
such as level, moisture, pressure transducers, etc. The ”-2” module provides six 0 - 20 mA DC analog
inputs. Note that the inputs on the ”-2” module will measure down to 0mA, so they can also be used
for zero based signals such as 0 - 10 mA. The modules transmit the “mA value” of the input, not a “%
of range”, so the output value is set to the correct mA signal.

Each analog input has a positive and negative terminal, and may be placed at any point in the current
loop, as long as neither input rises above the 24 volt supply level. Each input has a loop resi stance of
less than 250 ohms and zener diode protection is provided against over-voltage and reverse voltage ,
however additional protection may be required in high voltage or noisy environments or for very long
wiring runs.

A 24VDC loop supply is available on the module for powering the analog transducer loops. I n this
case, the analog loop should be connected between a "AI 1-" terminal and "COM" ( for the first analog
input) or "AI 2-" ( for the second analog input), and so on for other inputs.

_

+

DO 1
DO 2

COM

905U

DC

Load

Max 30VDC

0.5A

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 20 © January 2011

The positive terminal ("AI 1+" or "AI 2+", etc) should be connected to "+24V".

Externally powered loops may be connected by connecting the input between "AI 1+" and “AI 1-” for
analog input 1 or "AI 2+" and “AI 2-” for analog input 2, and so on for other inputs. Common mode
voltage may be -0.5V to 27V.

Shielded cable is recommended for analog I/O loops to minimise induced noise and Radio Frequency
Interference (RFI). The shield of the cable should be connected to earth at one of the cable only. The
use of shielded wiring inside an enclosure containing a module is also recommended.

To connect an AI on the 905U to an analog signal from a PLC or DCS output, check the internal
circuit of the output carefully as different devices use different ways to create an analog signal. The
following diagram shows two ways of connecting.

AO

PLC

_

+24V

+AI

- AI
COM

905U

+24V

+AI

- AI
COM

905U

Current

source
output

Note:

1. AI must be
within 27V of COM.
If terminal voltages
exceed this, a loop
isolator must be
used.

2. COM on the

105U is connected
to ground/earth. If

the COM of the
PLC cannot be
grounded, then a

loop isolator must
be used.

+

+V

-V

AO

COM

PLC

Current

sink
output

4-20mA

+

_

+24V

+AI

- AI
COM

905U

2-wire

Input

+

_

+24V

+AI

- AI
COM

905U

4-wire

Input

External

Power

Note:

AI must be within
27V of COM. If

terminal voltages
exceed this, a

loop isolator must
be used.

Chapter Two Installation

man_905-105_2.16 Page 21

2.4.5 Analog Outputs (905-1 and 905-3)

The ”-1” module provides two 4 - 20 mA DC analog outputs for connecting to instrument indicators for
the display of remote analog measurements. The ”-3” module provides eight 0 - 20 mA DC analog
outputs. Each analog output is a "sink" to common.

A 24VDC supply is available on the module for powering the analog output loop (max external loop
resistance 1000 ohms). In this case, the analog loop is connected between a "+24V" terminal and "AO
1" ( for the first analog output) or "AO 2" (for the second analog output), and so on for the other
output signals.

If connecting to an external device such as an electronic indicator, recorder or PLC / DCS input, the
loop can be powered be either the 905U or the device. Externally powered loops to 27 VDC may be
connected by connecting the output between the "AO” terminal (positive) and the "COM" terminal
(negative). Zener protection of analog outputs provides protecti on against short per iods of over-voltage
but longer periods may result in module damage.

Note that the common is connected internally to ground and no other poi nt in the analog loop should
be grounded. If the external device has single-ended grounded inputs, t hen a signal isolator must be
used.

Analog outputs may also be configured to individually turn off (0 mA) if no command message is
received to that output for a certain period. . See Chapter 4 Configuration for further details.

_

+

+24V

AO 1

COM

905U

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 22 © January 2011

DEVICE

_

Note:

COM on 905U is

connected to
ground/earth. If

the external power

supply cannot be

grounded, a loop
isolator

must be

used.

+

Connecting to a floating input device, powered from the 905U

+24V

AO 1

COM

905U

+V

-V
DEVICE

+

+24V
AO 1

COM

905U

_

Connecting to an externally powered floating-input device

+V

DEVICE

AI

+24V

AO 1

COM

905U

Signal
Isolator

Connecting to a grounded input device via a signal isolator

Chapter Two Installation

man_905-105_2.16 Page 23

2.4.6 Pulse Input (905-1)

For the ”-1” module, digital input 1 may be configured as a pulse input (max rate 100 Hz, min. off
time 5 ms). In this mode, both the pulse rate and the pulse count are available for mapping to a remote
output. The pulse rate may appear at any analog output on the remote unit, while the pulse count can
appear at a Pulse Output on another ”-1” or Digital/Pulse Output on a ”-3” or “-4” unit. The pul se i nput
should be connected in the same way as a digital input.

Active pulse signals can be connected directly provided the peak voltage is between 3.5–13V and the
low voltage is less than 1.5V. Note that the 905U will ground the negative of the pulse signal. If the
voltages are not compatible, use a solid state relay to isolate the two devices.

2.4.7 Pulse Inputs (905-2 and 905-4)

For the ”-2” and ”-4” modules, the four digital inputs (DI 1-4) may be configured as pulse inputs. The
first digital/pulse input DI 1 has a maximum rate of 1000 Hz (min. off time 0.5 ms), while DI 2-4
have a maximum rate of 100 Hz (min. off time 5 ms). When using DI 1 at high pulse rates (more than
100 Hz), a divide by 10 function may be configured to reduce the pulse count at the output, as Pulse
Outputs have a maximum rate of 100 Hz.

For each pulse input, both the pulse rate and the pulse count are available for mapping to a remote
output. The pulse rate may appear at any analog output on the remote unit, while the pulse count can
appear at a Pulse Output. The default update time for pulse counts is 1 minute. This can be changed
by changing the update time configuration - refer Chapter 4 Configuration for further details. The
pulse count is a 16 bit value - “roll over” of the count when it exceeds the maximum value is
automatically handled by the modules.

+

_

DI 1

COM

905U

Passive

transistor
device

+

_

+

_

DI 1

COM

905U

External

power

supply

+

_

Active pulse device

Note:
Use a solid
state relay if
the voltage
range is not

suitable.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 24 © January 2011

2.4.8 Pulse Output (905-1)

A single FET output to common rated at 30VDC, 500 mA is provide for the pulse output "PO". This
output accurately recreates the pulses counted at a pulse input at another module.

If the counter device requires a voltage pulse signal (such as electronic or elector-mechanical counters),
use the 24V analog loop supply, or the 12V BAT supply for the voltage source. Use a by-pass diode if
the counter is inductive.

Some devices such as PLC counter modules power the pulse loop. For these devices, connect to the
PO and COM terminals of the 905U. The COM terminal will connect a ground/earth to the external
device. If this is not suitable, use a solid state relay to isolate the external device.

Although the count is accurately re-created, the rate of output pulses may not accurately reflect the
input rate. The actual input pulse rate may be configured to appear at an analog output if required.
Note that the pulse rate and accumulated value will remain accurate even if a period of
communications failure has occurred. The maximum output rate is 100 Hz.

2.4.9 Pulse Output (905-3 and 905-4)

The first four digital outputs on the ”-3” and ”-4” modules may also be used as pulse outputs. The
outputs are FET output to common rated at 30VDC, 500 mA. The outputs will provide a pulse signal
of up to 100 Hz. The outputs accurately recreate the pulses counted at pulse inputs at a ”-1”, ”-2” or
“-4” module.

Although the count is accurately re-created, the rate of output pulses may not accurately reflect the
input rate. The actual input pulse rate may be configured to appear at an analog output if required.
Note that the pulse rate and accumulated value will remain accurate even if a period of
communications failure has occurred.

_

+

+24V

PO

COM

905U

Use by-pass

diode if counter
is inductive.

COUNT

+

_

+

_

+24V

PO

COM

905U

Use solid-state

relay isolator if
voltages are not
compatible

Chapter Two Installation

man_905-105_2.16 Page 25

2.4.10 RS232 Serial Port

The serial port is a 9 pin DB9 female and provides for connection to a terminal or to a PC for
configuration, field testing and for factory testing. This port is internally shared with the RS485 ­ensure that the RS485 is disconnected before attempting to use t he RS232 port. Communication is via
standard RS-232 signals. The 905U/105S is configured as DCE equipment with the pin-out detailed
below. The serial port communicates at a baud rate of 9600 baud, 8 bits, no parity, one stop bit. An
example cable drawing for connection to a laptop is detailed below:

MALE FEMALE

Pin Name Dirn Function

1 DCD Out Data carrier detect - not used
2 RD Out Transmit Data - Serial Data Input (High = 0, Low = 1)
3 TD In Receive Data - Serial Data Output (High = 0, Low = 1)
4 DTR In Data Terminal Ready - not used
5 SG - Signal Ground
6 DSR Out Data Set R eady - not used
7 RTS In Request to Send - not used
8 CTS Out Clear to send - not used
9 RI - Ring indicator - not used.

2.4.11 RS485 Serial Port

The RS485 port provides for communication between multiple units using a multi-drop cable. Up to 32
units may be connected in each multi-drop network. Each multi-drop network may have one unit
providing radio communications with other units in the system. The RS485 feature allows local hubs of
control to operate without occupying radio bandwidth required for communication between remotely
sited units.

The RS485 Communications format is 9600 baud, 8 data bits, one stop bit, no parity. Note that the
RS485 port is shared internally with the RS232 port - di sconnect the RS232 cabl e after configurati on is
complete.

RS485 is a balanced, differential standard but it is recommended that shielded, twist ed pair cable be
used to interconnect modules to reduce potential Radio Frequency Interference (RFI). An RS485
network should be wired as indicated in the diagram below and terminated at each end of the network
with a 120 ohm resistor.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 26 © January 2011

The modules include a terminating resistor on-board. If the 905U module is the first or last module in
the RS485 chain, then the terminating resis tor may be connected by operat ing the single DIP switch i n
the end-plate next to the RS485 terminals. “On” or “down” means that the resistor is connected.

2.4.12 Connecting 105S Modules to 905U Modules

105S modules connect to a 905U via the RS485 port on each module - refer to section 2.4.11. Up to
31 x 105S modules can be connected to a 905U module. This number is reduced for 105S-3 and –4
modules, as these modules use two unit addresses (refer to chapter 4 of this manual).

The 105S modules can be mounted next to the 905U module, or they can be remote from the 905U.
The reliable distance for a RS485 multi-drop line depends on the shielding of the wire and how close it
is installed to electrical noise sources - distances of more than ½ mile (1 km) can be achieved by good
installation methods. External RS485 isolators are recommended if the earth potential difference
between modules is greater than 7V.

A B

TERMINATING
RESISTOR SWITCH

905U
105S

RS485

A B

905U
105S

RS485

A B

905U
105S

RS485

A B

905U
105S

RS485

A B

Activate resi stor - c onnec tion
switch at both end modul es

Chapter Three Operation

man_905-105_2.16 Page 27

Chapter Three OPERATION

3.1 Power-up and Normal Operation

When power is initially connected to the module, the module will perform internal diagnostics to check
its functions. The following table details the status of the indicating LED’s on the front panel under
normal operating conditions.

LED Indicator

Condition

Meaning

OK

On

Normal Operation

RX Occasional flash Radio Receiving, or

Activity on serial ports

RX

Flashes continuously

Configuration Mode

RX On Button press when entering

Configuration Mode

TX

(only on 905U units)

Occasional flash

Radio Transmitting

PWR

On

Supply voltage available

from Solar Panel or

SUP1/SUP2

OK Flashes every 5 seconds +24V Supply

overloaded

Additional LED’s provide indication of the stat us of digital i nputs and outputs. LED’s di splay the st atus of
each digital input (lit for active), and LED’s display the status of each digital output (lit for active). Other
conditions indicating a fault are described in Chapter Six Troubleshooting.

The module monitors the power supply and provides status of supply failure and battery low voltage
for "mapping" to one of the module's own outputs or transmitting to a remote output. When the
module is powered from a normal supply (i.e. via either of the “SUP” terminals), the PWR LED
indicator is lit. When the modules is powered from a solar panel and battery, the PWR LED indicator
is lit only when the charge current is available (i.e. when the solar panel is receiving light).

If a backup battery is connected, the module will generate a low battery voltage status when the
voltage has dropped to 11.3V for approx 45 seconds. This status may be transmitted to another
module. In the event of excessively low battery voltage (10.8V), the OK LED will go off, the unit will
automatically set all outputs off, and disable the +24V analog loop supply. the OK LED will turn on
again after the battery voltage exc eeds 11.8V. This enables installations to be configured so that the
battery current drain is minimised in the event of extended mains failure, reducing the possibility of
deep discharge of batteries.

3.1.1 Communications

Before each transmission, the 905U radio will “listen-before-transmit” to make sure that another
module is not already transmitting - if there is another transmission, the 905U will wait until the

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 28 © January 2011

transmission is complete. When the 905U transmits, it will wait for a return “acknowledgement”
message from the destination module, indicating a successful message. If transmissions are not
successful (radio or serial), then the module will re-try up to four times at random intervals to transmit
the message.

Example of Successful Communications

Local Unit

• Listen to ensure channel is clear

Remote Unit

• If clear, transmit message

TX LED flashes if radio
RX LED flashes if RS485

• Receive message

RX LED flashes
Check message for integrity

• RX LED flashes

• Acknowledgement received okay –

communication complete

• If message okay, transmit it back

as acknowledgement

TX LED flashes if radio
RX LED flashes if RS485
Outputs updated as per

message received.

Example of unsuccessful communications

Local Unit

• Listen to ensure channel is clear

Remote Unit

• If clear, transmit message

TX LED flashes if radio
RX LED flashes if RS485

• Receive message

RX LED flashes
Check message for integrity
Message corrupted - do

nothing

• No acknowledgement received

• Retry up to four times

• Still no acknowledgement

“Comms fail” status to remote unit
set

If status is mapped to an output,
set output

•

If no update received for an
output within watchdog timeout,
check to see if the output is

configured to reset

• Reset outputs if configured

If communications is still not successful, the “Comms Fail” internal status will be set. In the default
configuration, this will have no consequence and the module will continue to attempt to transmit to the
remote module every ten minutes. For critical applications, the “comms fail” status can be configured

Chapter Three Operation

man_905-105_2.16 Page 29

to be reflected to an output on the module for alert purposes. The outputs on the module may also be
configured to reset after a specified timeout (digital outputs reset to “off”, analog outputs reset to 0
mA) allowing the system to turn off in a controlled manner e.g. a pump will never be left running
because of a system failure.

Note: The 905U will hop frequencies for each re-try transmission - each re-try will follow
at approx 0.5 sec after the last. However the 105U licensed fixed-frequency units will re-try
on the same frequency. In order to allow other users to clear the frequency channel, the
105U will wait a random time between 2 and 7 seconds between each retry. So a 905U will
complete all re-tries in less than 3 seconds, however a 105U will take 10 – 20 seconds.

Repeaters can be used in a system to increase range. Each 905U unit can be configured to act as a
repeater. When configuring an input to be mapped to an output, the communications path to the output
unit, including the repeater addresses is specified. The 905U acts as a store&forward repeater, that is,
the signal is decoded and then retransmitted “as new”.

Example Repeater Communications

Unit A DI 1 mapped to Unit D DO1 via Units B & C

Unit A

Unit B

Repeater

Unit C

Repeater

Unit D

•

DI 1 is turned

on

• Transmit

• Receive

Acknowledge

• Receive

• Transmit on with

Acknowledge

• Receive

Acknowledge

• Receive

• Transmit on with

Acknowledge

• Receive

Acknowledge

•

Receive

• Transmit

acknowledge

• DO 1 is

turned on

3.1.2 Change of state conditions

The module transmits a data message whenever it detects a "change-of-state" on one of its input
signals. A "change-of-state" of a digital or digital internal input is a change from "off" to "on" or vice­versa provided the change is sustained for 0.5 second (i.e. 0.5 second debounce). The debounce delay
is configurable.

In addition to "change-of-state" transmissions, each module will transmit the status of each input to its
corresponding output every ten minutes (configurable). These updates mean that the outputs are set to
the current input values regularly, even where no “change-of-state” has occurred. These update
transmissions increase the accuracy of the output and give extra system reliability.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 30 © January 2011

Analog Change-of-state

A "change-of-state" for an analog input, battery voltage or pulse input rate is a change in value of the
signal of 3% (configurable) since the last transmission. Note that the sensitivity of 3% refers to 3% of
the analog range, not 3% of the instantaneous analog value. That is, if an analog input changes from
64% (14.24 mA) to 67% (14.72 mA), a "change-of-state" will be detected. This “change-of-state”
sensitivity is configurable between 0.8% and 75%.

Analog inputs are digitally filtered to prevent multiple transmissions on continually varying or "noisy"
signals. The input is filtered with a 1 second time constant and a 1 second debounce. The analog
outputs are filtered with a 1 second time constant. An example of an analog input and how the output
follows it is shown below:

E

0.5 sec

0.5 sec

0.5 sec

SENSITIVITY

BAND

A B C

D

UPDATE

TIME

INPUT

SIGNAL

OUTPUT

SIGNAL

TIME

A No transmission as the sensitivity band was not exceeded
B

The sensitivity band was exceeded, however the input returned to within the

sensitivity band before the 0.5 sec debounce time - no transmission
C Transmission occurs 0.5 sec after the sensitivity band is exceeded.
D

Another transmission 0.5 sec later as the input has changed by more than

the sensitivity band
E

The input has not changed by more than the sensitivity, however the
update time has elapsed since D.

Chapter Three Operation

man_905-105_2.16 Page 31

In general, the following may be used as a rule of thumb for calculating the appropriate sensitivity
required for a given application:
Instantaneous change of 2 x sensitivity on input → 3 second output response
Instantaneous change of 10 x sensitivity on input → 5 second output response

The analog inputs have 15 bit resolution and 0.016mA accuracy.

Pulse input change of state
Pulse input counts do not use “change-of-state” transmissions. Instead, accumulated pulse input

counts are transmitted at set intervals. The default period is 1 minute and is configurable. The absolute
pulse count is transmitted. If the PI is tra nsmitted to a PO on a 905U/105S module, then the pulse
outputs are re-created from the accumulated pul se count. Rollovers of the pulse count thru zero are
catered for. If a transmission is missed, the pulse output will still be re-created when the next
accumulated value is transmitted. This ensures that no pulses are lost due to communications failures.
If the PI is transmitted to a 905U-C interface module, then the accumulated pulse count is stored in the
905U-C for interfacing to the host device.

The following diagram shows how pulse inputs are re-created as pulse outputs. For pulse outputs, the
module keeps two counters in memory - the pulse input count received from the remote module, and
the count of output pulses. When the receives an update of the input pulse count, it will output pulses
until the output pulse count is the same as the input pulse count. The output pulse will be output
evenly over the pulse output update time which is configured in the module. For example, assume that
module receives a pulse input update message from the remote module, and the difference between the
pulse input count and the pulse output count is 12 pulses. The module will then output the 12 pulses
evenly over the next minute (if the pulse output update time is 1 minute).

Input
Pulses

Time

Output
Pulses

PI update time

PO update time

Time

The default values for the pulse input update time and pulse output update time is 1 minute. In this
case, the output pulses are effectively 1 minute behind the input pulses. These updat e times may be
changed by the user. The pulse output update time should not be set to be more than the pulse input
update time. Note that the maximum pulse rate for both inputs and outputs is 100Hz.

As well as accumulating the pulse input, the module will also calculate the rate of pulses. Pulse rates

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 32 © January 2011

are treated as an “internal” analog input and are configured with analog sensitivities for change-of­state transmissions. The maximum pulse rate corresponding to 20mA output may be configured by the
user.

3.1.3 Analog Set-points

On “-1” modules, the “AI 1” input may be used to trigger the analog set-point status. High se t point
and low set point levels are configurable. This set-point status turns ON when the analog input moves
below the low level, and turns OFF when it moves above the high level. The high level must always be
greater than, or equal to, the low level set point. This set-point status may be mapped (inverted, if
required) to any output in the network. The set-point status is effectively an internal digital input.

On ”-2” modules, AI 1 - 4 have set-point values for controlling digital outputs. The set-point
operation works as for the ”-1” module.

3.1.4 Start-up Poll

After a module has completed its initial diagnostics following power up, it will transmit update
messages to remote modules based on the values of the module’s inputs. The module’s outputs will
remain in the reset/off/zero condition until it rece ives update or “change-of-state” messages from the
remote modules.

The module can transmit a special “start-up poll” message to another module. The remote module will
then immediately send update messages to this module such that its outputs can be set to the correct
value. Start-up polls will only occur if they are configured. It is necessary to configure a start-up poll
to each remote module which controls the module’s outputs. For further information, refer to Chapter
4 Configuration.

3.1.5 Communications Failure (CF)

The internal communications failure (CF) status is set if a module does not receive an
acknowledgement message after five attempts at transmitting a message. The CF status may be
configured to set a local digital output for an external alarm.

Although the CF status can set an output, it will not reset the output. That is, once communications is
re-established (and the CF status is reset), the output will stay “on”. The Reset Output feature (see
below) is used to reset the output.

The output will reset only when no communications failures occur within the configured “Reset Output
Time” for the output that CF status is mapped to. Note that if the reset output time is not enabled, the
CF status will remain set forever, once an unsuccessful transmission occurs. See Chapter 4
Configuration for further details.

For a link with one or more repeaters, the internal CF status will only set for a failure between the
transmitting module (the source module) and the first repeater. If the communications failure occurs
after the first repeater, then the source module CF status will not set. To indicate comms status on this
type of link, the “Reset Output” function should be used.

Chapter Three Operation

man_905-105_2.16 Page 33

3.1.6 Resetting Outputs

Each digital and analog output may be individually configured to reset if that output has not receive d a
change-of-state or an update message within a certain time period. Generally this time is set to twice
the update period, so at least one update can be missed before an output is reset.

In most cases it is desirable to reset outputs which are controlling equipment if there is a system failure,
however alarm or indication outputs are not reset so the last valid indication remains shown. See
Chapter 4 Configuration for further details.

3.2 System Design Tips

The following tips will help to ensure that your system operates reliably.

3.2.1 System Dynamics

It is important to be aware of the dynamics of the system. Inputs have a configurable “debounce” delay
(default 0.5 sec) - that is, a change message will not be sent for 0.5 sec after a change has occurred.
This avoids transmitting spurious noise on the input signal. If you require faster (or slower) operation,
change the debounce setting.

Messages transmitted via serial link are received in less than 20 msec, however a message sent by
radio takes approx 60 msec.

These delays are not significant is most applications, however if your application requires faster
responses, then the above delays need to be considered.

3.2.2 Radio Channel Capacity

Messages sent on a cable link are much faster than on a radio channel, and the capacity of the radio
channel must be considered when designing a system. This becomes more important as the I/O size of
a system increases.

The modules are designed to provide “real-time” operation. When an input signal changes, a change
message is sent to change the output. The system does not require continuous messages to provide fast
operation (as in a polling system). Update messages are intended to check the integrity of the system,
not to provide fast operation. Update times should be selected based on this principle. The default
update time is 10 minutes - we recommend that you leave these times as 10 minutes unless particular
inputs are very important and deserve a smaller update time.

It is important that radio paths be reliable. For large systems, we recommend a maximum radio
channel density of 100 messages per minute, including change messages and update messages. We
suggest that you do not design for an average transmission rate of greater than 40 per minute - this
will give a peak rate of approx 100 per minute. Note that this peak rate assumes that all radio paths are
reliable - poor radio paths will require re-try transmissions and will reduce the peak channel density.
If there are other users on the radio channel, then this peak figure will also decrease.

Dual Band Operation

The 905U radio band is split into two sub-bands, 902-915 MHz and 915 – 928 MHz . In America and

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 34 © January 2011

Canada, the 905U uses both sub-bands - but in other countries, only the high sub-band. In America
and Canada, it is possible to restrict the frequency hopping of the 905U to only the high or low band.
If there are many 905U systems in the same area, this technique will help to separate systems to avoid
radio interference. Note that this technique is only possible in America / Canada.

The radio sub-band can be selected by the “system address” - refer section 4 of this manual. An odd
system address selects the low band, and an even system address selects the high band.

Note that this section is not applicable to the fixed frequency 105U units.

3.2.3 Radio Path Reliability

Radio paths over short distances can operate reliably with a large amount of obstruction in the path. As
the path distance increases, the amount of obstruction which can be tolerated decreases. At the
maximum reliable distance, “line-of-sight” is required for reliable operation. If the path is over several
kilometres (or miles), then the curvature of the earth is also an obstacle and must be allowed for. For
example, the earth curvature over 5 miles (8km) is approx 10 feet (3m), requiring antennas to be
elevated at least 13 feet (4m) to achieve “line-of-sight” even if the path is flat.

A radio path may act reliably in good weather, but poorly in bad weather - this is called a “marginal”
radio path. If the radio path is more than 20% of the maximum reliable distance (see Specification
section for these distances), we recommend that you test the radio path before installation. Each
105U/905U module has a radio path testing feature - refer to section 6.2 and 6.3 of this manual.

There are several ways of improving a marginal path :-

• Relocate the antenna to a better position. If there is an obvious obstruction causing the problem,

then locating the antenna to the side or higher wil l improve the path. If the radio path has a large
distance, then increasing the height of the antenna will improve the path.

• Use an antenna with a higher gain. Before you do this , make sure that the radiated power from the

new antenna is still within the regulations of your country. If you have a long length of coaxial
cable, you can use a higher gain antenna to cancel the losses in the coaxial cable.

• If it is not practical to improve a marginal path, then the last method is to use another module as a

repeater. A repeater does not have to be between the two modules (although often it i s). I f possible ,
use an existing module in the system which has good radio path to both modules. The repeater
module can be to the side of the two modules, or even behind one of the modules, if the repeater
module is installed at a high location (for example, a tower or mast). Repeater modules can have
their own I/O and act as a “normal” 905U module in the system.

3.2.4 Design for Failures

All well designed systems consider system failure. I/O systems operating on a wire link will fail
eventually, and a radio system is the same. Failures could be short-term (interference on the radio
channel or power supply failure) or long-term (equipment failure).

The modules provide the following features for system failure :-

• Outputs can reset if they do not receive a message within a configured time. If an output should

Chapter Three Operation

man_905-105_2.16 Page 35

receive an update or change message every 10 minutes, and it has not received a message within
this time, then some form of failure is likely. If the output is controlling some machinery, then it is
good design to switch off this equipment until communications has been re-established.

The modules provide a “drop outputs on comms fail” time. This is a configurable time value for
each output. If a message has not been received for this output within this time, then the output will
reset (off, in-active, “0”). We suggest that this reset time be a little more than twice the update
time of the input. It is possible to miss one update message because of short-term radio interference,
however if two successive update messages are missed, then long term failure is likely and the
output should be reset. For example, if the input update time is 3 minutes, set the output reset time
to 7 minutes.

• A module can provide an output which activates on communication failure to another module. This

can be used to provide an external alarm that there is a system fault.

3.2.5 Indicating a Communications Problem

There are two ways to provide an indication of communications problems.
Fail-to-transmit alarm. The first is to map the internal CF status to a local output, to generate a “fail-

to-transmit” alarm. The configured output will activate when a comms fail occurs - that is, when the
module attempts to transmit a message five times without an acknowledgement. This method provides
an indication immediately an attempt to transmit a message fails. If you want the radio path to be
“tested” regularly, then you need to configure the update times such that transmissions occur regularly
(however do not overload the radio channel).

Notes regarding this method:

1. Each CF mapping corresponds to only one remote address - you need to make separate mappings

for each remote address. You can map the CF for each remote module to a separate output, or to
the same output.

2. You need to reset the comms fail output using the “reset output” parameter. Select a reset time

which is greater than the effective update time period. For example, if there are four inputs
mapped from module #1 to module #2, each with a 10 minute update, then you would expect at
least four transmissions in each 10 minute period. At module #1, a comms fail for #2 is mapped to
DO1. If you set the “reset time” for DO1 to 10 minutes, then there will be at least four
transmissions made during the reset period - that is, the output will only reset when the
communications has been successful four times.

3. This method will not work for radi o li nks with r epeat ers. I f a repeat er i s used, you wil l nee d to use

the second method described below.

Fail-to-receive alarm. The second method is to set up a “comms OK” output using the “Reset
Outputs” function. The output is normally on, indicating “comms OK”, and will reset if the module
does not receive a message from the remote module within the configured reset time.

Consider a link between module #1 and #2, and assume that you want a “comms OK” output at #1. At
#2, map an unused input to an output at #1 such that the out put i s normally acti ve (‘ on”). I f there i s no
spare inputs at #2, you can use an internal input such as “low voltage status”. You will need to invert
the mappings such that the output is normally on (because the input is normally off).

At #1, configure a reset time for the output. The reset time should be greater than the update time for

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 36 © January 2011

the mapping at #2. If #1 fails to receive update messages from #2, then the output will reset,
indicating a communications failure. Notes regarding this method:

1. This method will work with repeaters in the link.

2. The “comms OK” output is fail-safe - if module #1 fails, then the output will reset indicating a

problem.

3. You should use separate outputs to indicate “comms OK” of different remote modules.

4. It is recommended that you set the reset time at #1 to more than twice the update time of the

mapping at #2. This means that the comms OK output will only reset if #1 misses two consecutive
updates from #2.

3.2.6 Testing and Commissioning

We recommend that you set-up and test the system with all of the modules together before you install
the modules. It is much easier to find a configuration problem.

When the system is configured, record the radio signal strength and background noise l evel for each
radio link. If there are future communications problems, you can compare the present measurements to
the as-commissioned values. This is an effective way of finding problems with antennas, cables and
also changes in the radio path (for example, the erection of new buildings).

3.3 Security Considerations

There are three dimensions of security considerations:

1. Failure to operate when required - or “operational reliability”.

The features discussed above optimize operating reliabili ty. Using an acknowledgement and re-try
protocol ensures that the transmitting module is aware whether the transmitted message has been
transmitted reliably. The “fail to transmit” and “fail to receive” alarms provide indication if the
radio link has failed to operate.

2. Mal-operation, or operating when not requested.

This problem occurs when an output is “triggered” by the wrong radio device. The 905U modules
use frequency encoding and a very secure addressing system to ensure this does not occur. An
additional security level using data encryption can also be selected.

3. Malicious operation, or “hacking”

This is the problem most associated with security concerns - the ability for someone to access
information from a radio system by “listening-in”, or to cause damage by transmitting radio
messages to force outputs.

A security option can be selected during the module configuration to protect against this. The security
option (if selected) adds data encryption to radio messages. Modules in the same system are
automatically configured with the encryption key, such that only these modules can understand each
other. “Foreign” modules will hear the messages, but cannot decrypt the messages. For more
information, refer to section 4.3.7.

Chapter Four Configuration

man_905-105_2.16 Page 37

Chapter Four CONFIGURATION

4.1 Introduction

The modules are configured by connecting a computer (PC) using the Configuration Software program.
The same software program is used to configure 905U-C and 905U-G modules - for more
information, refer to the separate User Manuals for these products.

Each module is configured with a system address and a unit address. The system address is common to
every module in the same system, and is used to prevent "cross-talk" between modules in different
systems. Separate networks with different system addresses may operate independently in the same
area without affecting each other. The system address may be any number between 1 and 32 767. The
actual value of the system address is not important, provided all modules in the same system have the
same system address value. A system address of zero should not be used. The configuration
program automatically offers a random number for the system address - you can change this to any
number in the valid range but we recommend that you use the random number.

Each module must have a unique unit address within the one system. A valid unit address is 1 to 127.
A network may have up to 95 addresses communicating via radio (unit addresses 1 to 95), each with
up to 31 modules communicating via RS485 (unit addresses 96 to 127). In the network, any individual
input signal may be "mapped" to one or more outputs anywhere in the system. The unit address
determines the method of communication to a module. Any module with a unit address between 96
and 127 will communicate by RS485 only. Other units with a unit address below 95 may communicate
by radio or RS485 - the unit will determine which way to communicate depending upon the unit
address of the destination module. For example, Unit 31 will talk to Unit 97 by RS485 only, but will
talk to unit 59 by radio only. 105S units must always have a unit address bet ween 96 and 127 as serial
communication is the only method of communication available. A unit address of zero should not be
used.

The four different I/O versions in the range can be used together in the same system. 905U-C and
905U-G modules can also be part of a system. Inputs to one product type can be transmitted to output s
of another product type. For example, an analog input to a ”-2” may be transmitted to an analog
output of a ”-1” or ”-3”. Repeaters may be any product type.

The ”-1” and ”-2” modules require only one unit address. The ”-3” and ”-4” modules use two
addresses, however only one unit address has to be entered. The ” -3” and ”-4” modules require two
addresses because of the large number of output channels. If the “entered" unit address is an even
number, then the second address is the next number. If the "entered" address is an odd number, then
the second address is the previous number. So the two addresses are two subsequent numbers, starting
with an even number. If a ”-3” module is given a unit address of 10, then it will also take up the unit
address 11 and will accept messages addressed to either 10 or 11. It is important to remember this
when allocating unit addresses to other modules in the system.

Warning - do not allocate the address number 1 to a “-3” or “-4” module.
In addition to these network configurations, operational parameters called User Options may be

configured to change the features of the operation.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 38 © January 2011

4.2 Easy Configuration Using Default Settings

If your application requires only a single pair of modules, communicating via radio or serial link, default
settings may satisfy your needs. If so, no configuration is required. Essentially, all inputs at Module A are
reflected at the corresponding outputs at Module B. All inputs at Module B are reflected at the
corresponding outputs at Module A.

For “-1” modules, the default configuration is as follows :-

In this configuration, the “PO” Pulse output is inactive and no speci al action is taken on “Comms fail”,
“Mains fail” or “Battery Low”. “DI 1” is configured as a digital and not a pulse input.

Chapter Four Configuration

man_905-105_2.16 Page 39

For “-2” and “-3” modules, the default configuration is
as follows :-

Note that there is no default configuration for the “-4” modules.
The following table details the default valu es for User Option s:

Option Factory Set Value

Update transmissions Every 10 minutes

Analog Change-of-state sensitivity 3%

Reset outputs on Comms fail No

Analog Setpoints (if mapped) Low Set point = 30%

High Set point = 75%

Pulse Output Rate Scaling

(if Pulse Rate is mapped)

100 Hz

Digital Input Debounce Time 0.5 seconds

If any of the above values are not appropriate to your system, Section 4.4 below will detail how to change
one or all of the above variables.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 40 © January 2011

4.3 Configuration Software

This chapter describes installation and operation of configuration software for the radio and serial
telemetry modules. The configuration software runs on a conventional PC as a Windows application.
The software creates a configuration file which can be loaded into a module via RS232. The
configuration software also allows the configuration of a module to be loaded for display and
modification. Configuration files are created and stored in project directories.

Configuration of modules consists of entering I/O mappings, and selecting User Options. An I/O
mapping is a link between an input on the module being configured and an output on another module.
A mapping has the form :-

DI3 → Out2 at 4 via 3, 11

This mapping links DI3 on this module to output channel 2 on the module with address 4, and modules
3 and 11 are repeaters.

User Options may be selected to change the configuration of specific features.
Mappings configured to a 905U-C have the form :-

AI2 → I/O Reg 1036 at 10 via 7

This mapping links AI2 on a 905U module to I/O Register 1036 in a 905U-C with address 10. Module
#7 is used as a repeater. The host device connected to the 905U-C can read the I/O register.

Note: Every module must have at least one mapping configured to another module. If no
mappings are required (for example, you are only using outputs at a module), then you need to
configure a mapping for a spare input to an unused output on another module.

4.3.1 Hardware and Software Requirements

The configuration software is available on a CD, and needs to be installed on your PC before you can
use it. The CD contains a setup
file called setup.exe. Select the
configuration software window on
the Product CD and an installation
Wizard will guide you through the
installation procedure. To upload
and download configuration files
to a module, you will need a RS­232 serial cable as shown below.

4.3.2 Program Operation

Start the software by either
clicking on the start bar and
navigating to the Configuration menu or by running ESERIES.EXE in the directory selected in the

905 End

DB9 Male

1
2
3
4
5
6
7
8

Required

Optional

PC End

DB9 Female

1
2
3
4
5
6
7
8
9

Chapter Four Configuration

man_905-105_2.16 Page 41

setup stage.
The Initial screen will appear.

The configuration is performed
for a complete system. The
necessary configuration stages
are :

 select system name and system

address

 select individual units and unit

addresses

 configure I/O mappings for

each unit

 configure user options for each

unit

 load the configuration files

into each unit.

From the initial screen, you can
select an existing project, or start
a new project. The name of the project will create
a new directory which will eventually contain the
configuration files for the modules in this system.

When you have selected the project, a screen
will appear where you may enter the system
address.

If you are editting an existing project, the system
address will already have been entered. Do not
change the system address unless you are going
to re-program all of the modules in the system.

Password. You have the option of entering a
password to protect the configuration files
against unauthorized changes. When you open a
new project, you will be asked to enter a
password - if you do not enter any text - that
is, press “ESC” or “Enter”, then password
protection is disabled. If you do enter a
password, then you will need to enter this
password to make changes to the configuration or
download or upload configuration. You only
need to enter the password each time you enter
the project. Without the passowrd, you are able
to view the configuration details but you cannot
make changes.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 42 © January 2011

The password can be between 6 and 256 characters. You can also change password by selecting this
option from the “Utilities” menu.

If you are starting a new project, you have the option
of “Enabling Security” - please read Section 4.3.7 and
the associated warnings before using this option.

To proceed with the configuration, double-click on the
project name on the menu on the left side of the screen.
“Units” will appear. You can now enter the types of
units which will be used in the system. If you double­click on “Units”, then the modules that have already
been selected will appear.

Loading configuration from an existing module

To load the configuration from a module, connect the module to the PC via the RS232 cable and click
on “Load Unit”. This will allow you to view the module configuration, change it, or copy it for
another module - refer to section 4.3.3 for more information.

Adding a new module to the system configuration
To add a new module to the system configuration, click on “Units” on the left-hand menu and then
“Add Unit”. Select the type of module from the list.

Note that this program covers 105U, 105S and 905U modules.
These modules are essentially the same as far as configuration is
concerned. That is, a 105-1 or a 905-1 selection will configure a
105U-1, 105S-1 or a 905U-1.

The program will ask to select the unit address and will display
the list of available addresses for you to select. For 905U
modules, select an address between 1 and 95. For 105S
modules, select an address between 96 and 127.

The default name for a unit will include the unit address. For
example, “905-3#8” is a 905U-3 module with unit address 8
(and also 9, as a -3 takes two unit addresses). You can change
the name of a unit - for example, you could replace the default
name with “Pump Station 14”.

Deleting a Unit

A module can be deleted from the configuration by highlighting
the unit and selecting “Delete Unit”.

Chapter Four Configuration

man_905-105_2.16 Page 43

Configuring an individual module

Double-click on a unit shown on the left-hand menu. The configuration options for each unit will
appear. We recommend that you configure I/O mappings first, and then other options.

Select “Mappings” and the following screen appears. There
are three types of mappings:

• I/O mappings which link inputs to outputs

• Poll mappings, which enables a module on start-up to

request set its outputs quickly

Comms Fail mappings, which maps communication failure
status to an output on the local module.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 44 © January 2011

I/O Mapping To enter an I/O mapping, select “New I/O Mapping”.

1. The I/O mapping display will show all inputs at the selected module - both physical inputs and

internal inputs. Select the input to be mapped.

2. If you wish to inver t the mapping, select the “Invert Input” box. If you invert an input, then the

output will be the reverse of the input. Analog I/O can also be reversed - 4mA will be 20mA etc.
Do not invert pulse inputs.

3. The invert function is not available on -2 modules - only inverted digital inputs are available (as

internal inputs on the input list).

4. To select the de stinati on module, you can ei ther sele ct the module from the “Destination Unit” l ist,

or enter the unit address in the “To Destination” box. You can enter an address that has not yet
been allocated to another unit.

5. You can select the output by entering the output number (1 – 8) in the “output” box, or select an

output from the displayed list. There will only be a list of possible outputs displayed if at st ep 2
you selected a desrtination until that has already been configured in the system. The output

Chapter Four Configuration

man_905-105_2.16 Page 45

numbering for each module is:

905U-1 905U-2 905U-3

First addr
(Even)

905U-3
Second addr
(Odd)

905U-4
First addr

(Even)

905U-4
Second addr
(Odd)

Output 1 DO 1 DO 1 D/P O 1 AO 1 D/P O 1 DIO 5
Output 2 DO 2 None D/P O 2 AO 2 D/P O 2 DIO 6
Output 3 DO 3 None D/P O 3 AO 3 D/P O 3 DIO 7
Output 4 DO 4 None D/P O 4 AO 4 D/P O 4 DIO 8
Output 5 AO 1 None DO 5 AO 5 DIO 1 DIO 9
Output 6 AO 2 None DO 6 AO 6 DIO 2 DIO 10
Output 7 PO None DO 7 AO 7 DIO 3 DIO 11
Output 8 None None DO 8 AO 8 DIO 4 DIO 12

6. If you select a 905U-G as the destination module, you will be asked to select a I/O Register as the

destination “output”. Note that the grey-shaded I/O registers have already been allocated.

7. Select any intermediate repeater units needed to reach the destination address (entered in order of

nearest to furthermost repeater). You can either select from the list of configured units or enter the
unit address in the “Repeater” box. If no repeaters are required, do not enter anything in the
repeater boxes. If only one repeater address is required, enter the address in box 1 and leave the
other repeater boxes empty.

Note: Every module must have at least one mapping configured to another module. If no
mappings are required (for example, you are only using outputs at a module), then you need to
configure a mapping for a spare input to an unused output on another module.

It is possible to configure multiple mappings for an input - each mapping will generate separate
transmissions. We recommend that you do not configure multiple mappings to the same output as the
output will have the value of the last message that it receives. Each output should have only one
mapped input.

It is possible to map a digital input to an analog output - the output will be maximum value when the
input is on and minimum value when the input is off. It is also possible to map a analog input to an
digital output - the output will be on when the input is equal or greater than 12mA and off when the
input is less than 12mA.

For more information on using 105S modules, refer to Section 4.3.8.

Edit existing mappings

To edit an existing mapping, double-click on the mapping line, or select the mapping line and “Edit”.

To delete an existing mapping

To delete a mapping, select the mapping and delete or right-mouse click and select Delete.

Configuring Start-Up Polls

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 46 © January 2011

When a unit is first turned on, its outputs
will not be set until it receives update
messages from other units in the system. To
ensure that outputs are set as soon as
possible after start-up the unit may be
configured to “Poll” any other units with
mappings to its outputs.

Select the remote unit to be polled from the
unit list, or enter the unit address in the box.
If the remote unit communicates via
repeaters, select the repeater units or enter
the repeater addresses.

Remember that if more than one remote unit
is controlling the local outputs, then more
than one start-up poll should be configured.

Configuring Comms Fail Mappings

Each module has a “comms fail” status which may be mapped to a local output. The comms fail status
is active (on) if the module is transmitting a message and does not receive an acknowledgement after
five tries. By setting the comms
fail status to a local output, you
can provide a communications
alarm. The local output can be
digital or analog - if analog,
the output will go to maximum
value.

Although communication failure
will activate the output,
successful comms does not reset
the output. You must use the
“Reset outputs on comms fail”
option (Refer to User Options section).

Each remote module has a separate comms fail status - you enter a separate comms fail mapping for
different remote addresses. You can configure several comms fail mappings to the same output - the
output will be active if there is comms fail to any of the remote addresses. Configuring a “Comms Fail
Address” of zero causes communication failure to any destination module to be indicated on the
selected output.

For example, if “Comms fail to unit 12” is configured to DO1, then the module will set (or act ivate)
DO1 each time communications to unit 12 is not successful. If DO1 has a “Reset output” time of 10
minutes configured for DO1, then DO1 will reset (de-activate) 10 minutes after the last comms fail to
unit 12.

Chapter Four Configuration

man_905-105_2.16 Page 47

Debounce Configuration

Debounce is the
time which an
input must stay
stable before the
module decides
that a change of
state has occurred.
If a digital input
changes (say 0 →

1) and changes
again (1 → 0) in
less than the
debounce time,
then the module
will ignore both
changes.
Debounce may be configured for digital inputs on the –1, -2 and -4 modules (0.5 - 8 seconds) and the
analog inputs on the -2 module (0.5 - 8 seconds). The default value of 0.5 seconds is s uitable for most
applications. In applications where a digital input may turn on and off several times slowly (for
example, security switches or float switches) a debounce time of up to 8 seconds may be configured.

The configured debounce time has no affect on pulse inputs.

Note that the analog debounce is not configurable for the -1, but is configurable in the -2.
Update Time Configuration

Update messages are sent if a change
message has not occurred within the
update time period. The update time
may be set for each input - both
physical and internal inputs.

The default period is 10 minutes for
all inputs, except for pulse inputs (1
minute). Short update times should
only be used in special circumstances.
It is important to remember the
principle - “Less radio traffic means
better communications”. Frequent
updates from multiple units causes
congestion of the radio channel, which
results in increased communication
failures and poorer performance of the
system. To change an update time,
select “Update Times” on the left­hand menu and double-click the
selected input. The update time will be shown in days:hours:minutes:seconds. Change the values in

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 48 © January 2011

each field. The display also shows the maximum and minimum values. For the -1, -2 and –3 modules,
the maximum update time is 16 minutes, however the update time for -4 inputs can be up to 5 days.

If a zero value is entered as an update time, then the input will not update at all.

Changing Multiple Settings

You can change the Update Times of several inputs simultaneously by using the <Shift> Select feature.
For example, if you want to change all digital inputs to 1 minute update, you could change each
individually, or you could “block” the four digital inputs using t he “Shift” Select feature and select
“Edit”. You only need to enter the change once to change all of the inputs selected. This feature is
also available with the other configurable parameters.

Output Reset Time Configuration

This allows the Comms Fail Time
to be selected - this is the time for
an output to reset if it has not
received an update or change
message.

Each output on the unit, either analog
or digital, may be configured to reset
(off or 0mA) when no update
transmission has been received for a
certain time. This option can be used
to ensure that communications failure
will not result in loss of control. For
example, outputs connected to pumps
should be configured to reset on communications failure s o that the pump will turn off. The default
condition is zero (no reset).

If the reset time is less than the update time, then the output will reset when the reset time expires, and
then set again when the update message is received. We recommend that the reset time be a little more
than twice the update time.

To set an output reset time, select “Output Reset Times” on the left-hand menu and double-click the
selected input. The update time will be shown in days:hours:minutes:seconds. Change the values in
each field. The display also shows the maximum and minimum values.

Chapter Four Configuration

man_905-105_2.16 Page 49

Analog Sensitivity Configuration

The analog sensitivity is the change required in an analog input before a “Change Of State” i s detected,
and the new analog value is
transmitted. For input signals which
vary widely over a short period of
time or have a normal oscillation,
the analog sensitivity should be set
to an appropriately large value. This
ensures that many change messages
are not transmitted in too short a
time. This will result in channel
congestion, as described in the
preceding section.

To change an analog sensitivity,
select “Sensitivities” on the left­hand menu and double-click the
selected input. The sensitivity for
physical inputs is shown in mA and
internal input is shown as %.

SetPoint Configuration
Setpoints allow a remote

digital output to be turned
on and off depending on
the value of an analog
input. The “set-point
status” internal input must
be mapped to an output
for this option to have
effect. When the AI is
less than the Low Set­point (LSP), the set-point
status will be active (on,
“1”) - when the AI is
more than the High Set
Point (HSP), the set-point
status will be reset (off,
“0”). Note that the High
Set Point (HSP) must always be higher than the Low Set Point (LSP). For the -1 module, only AI1 has
set-point values. For -2 modules, the first four analog inputs (AI 1 – 4) have set-points.

Debounce time operates on the set-point status in the same way as digital inputs.
To change a setpoint values, select “SetPoints” on the left-hand menu and double-click the selected

Setpoint Status.

Pulse Input Count Configuration

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 50 © January 2011

PI1 of the -2 and -4
modules normally
count up to 100Hz (as
for the other PI’s),
however can be
configured to count up
to 1000Hz. This
configuration actually
divides the input count
by 10 - each count in
the PI1 register is then
equivalent to 10 input
pulses. If PI1 is
mapped to a PO, then
the maximum output
pulse rate is 100Hz, however each output pulse is equivalent to 10 input pulses.

To configure the “divide by 10” feature, select “Pulse Inputs” on the left-hand menu and select the
“Count” page - double-click “Pulse Input 1 Count” and enable “divide by 10” counting.

Pulse Input Rate Scale Configuration

When a pulse rate is mapped to
an analog output, the rate must
be scaled to the 4-20mA output.
The pulse rate scale is the rate
(in Hz) corresponding 20 mA.

To configure the pulse rate
scale, select “Pulse Inputs” on
the left-hand menu and select
the “Rate” page - double-click
the pulse input rate and enter the
scale value.

Chapter Four Configuration

man_905-105_2.16 Page 51

Pulse Output Update Time Configuration
The pulse output update time is

the time period over which pulses
are output after a PI update is
received. It should be configured
to correspond to the pulse input
update time for the corresponding
pulse input. This ensures that the
pulse output rate matches as
closely as possible the pulse input
rate which it is reflecting.

For example, if the PI update
time is 1 minute, then the PO
update time should also be 1
minute. If the PI update time is
changed, then the PO update time
at the remote module should be
also changed. The PO will still operate if the time is not changed, however pulses may be output
faster or slower than the input pulses.

To configure the pulse output time, select “Pulse Outputs” on the left-hand menu and select the “Pulsed
Output Time” page - double-click the pulse output and enter the new time.

Pulse Output Enable

The PO’s for the -2 and -4
modules are also DO1-4. To use
as pulse outputs, you need to
enable them as pulse outputs.

To enable pulse outputs, select
“Pulse Outputs” on the left-hand
menu and select the
“Enable/Disable” page - double­click the pulse output to enable.

Compiling a System

When you have finished
configuring the modules, you
should compile the system. The
compile function scans the
configuration and reports any detected errors. To compile the system, select “Compile System” from
the “Utilities” menu. Select the “Compile” button. The system will compile - the display will show if
there are any compile errors or warnings.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 52 © January 2011

4.3.3 Programming Configurations to Modules
To program a module :

• Connect the cable

from the PC’s serial
port to the module
serial port (see 2.4.10
for cable connections)

• From the Utilities

menu, select “Serial
Port Setup”

• Select the appropriat e

serial port (COM1 ­COM4)

• Select the unit to be

configured from the
left-hand menu

• Double-click

“Program Unit”.

Each module will need to be programmed individually.

4.3.4 Loading Configuration from a Module

Care should be taken when loading a configuration from a module. It is easy to lose the system address
and unit address. We suggest that you first view the system address and unit address - you can do this
via the “Unit Options” menu. Note these addresses before loading the configuration.

When you upload the configuration, the program will check if you want to load the addresses from the
module. If you do not, then the system address and unit address will change.

You are able to upload the configuration from a module into a new “project”, to view the configuration
and modify it. Note that as the “project” will not have the details of the other modules in the system,
the other modules and outputs will be shown as unit addresses and output numbers. Don’t forget to
download the configuration into the module after you modify it.

If security has been enabled for the system, please read section 4.3.7.
If you are adding additional mappings to a 905U-C or 905U-G module, then you need to change the

archived configuration files first so you can download the modified configuration details into the
905U-C or 905U-G

4.3.5 Modifying and Archiving Configuration Files

As you build a system configuration, it is automatically saved in the “Project” directory. We

Chapter Four Configuration

man_905-105_2.16 Page 53

recommend that all system additions and changes be made to the archived configuration files first, and
then downloaded to the module/s. This ensures that the archived files are always maintained and
accurate. If you modify the configuration of a module by uploading and then downloading, then the
module configuration will be different then the archived files.

If you lose the configuration files for a system, then you can rebuild the configura tion by uploading
the configuration file from every module in the system.

4.3.6 Print Options

You can obtain a print-out of each module configuration. On each unit display, there are “Unit
Summary” and “Mapping Summary” windows. Each of these will display a printable information page
about that module. The Unit Summary page will display the user options configured, and the Mapping
Summary will display the mappings entered for that unit.

The printer may be selected from the Printer Setup option in the File menu.

4.3.7 Security

There are two security features available. You can enter a password to protect the configuration files,
and you can enable security encryption of the radio transmissions.

The password can be between 6 and 256 characters. The password is case sensitive and any ASCII
characters can be used. If you have entered a password, then this password will need to be entered if
the configuration is to be changed later . You can view the configuration, but you will not be able to
make any changes. You are able to change the password from the “Utilities” menu. If unauthorised
access to the files is a concern, we recommend that you change the password regularly or whenever
there is a change of staff.

Security Encryption is an additional level of securi ty. The security option uses an 8-character security
key to provide 64-bit data encryption of the radio messages. All modules in the same system will be
configured with the same security key used to encrypt and decrypt the messages. This feature is
available for modules with serial numbers with the middle three numbers greater than 210 - that is
xxxx210xxxx, or xxxx220xxxx etc. If you are adding modules to an old system which does not have
the security encryption feature, then you cannot use security encryption on the new modules.

Note that the security key is different than the password.

• To enable the security encryption, select the “Enable Security” box on the projec t display. An 8-

character security key is entered and you will be prompted to enter the security code a second time
to confirm. The security key can be any characters or numbers. Characters are case sensitive. The
security key will never be displayed.

• If you do not enable security, there will be no data encryption of the radio messages. This is the

default setting.

• If a security key has been entered, this key is downloaded into each module as part of the

configuration download process. You can download another configuration at any time - if the
security key is different, or if there is no security key in the new configuration, the old key will be
over-written.

• You can change the security key in the configuration files simply by enteri ng a new security key in

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 54 © January 2011

the security key window. You will be prompted to confirm the new security key. If the
configuration files are password-protected, you will be asked for the password. Note that if you
change the security key, it will not match the security key previously loaded into existing modules.

• If you want to change a configuration, we recommend that you change the archived configuration,

and then download the configuration onto the module. The archived configuration already has the
valid security key.

• If you lose the archived configuration, you can upload the configuration from a module, but you

cannot upload a security key. That is, you can upload the module configuration, view it, change it

- but if you don’t know the original security key, the old key will be over-written when you
download the new configuration. This module will no longer communicate with other modules in
the system as the security key is different.

The security options provide security against a “hacker” in the following way:

 A hacker cannot listen-in to radio messages without the security key t o decrypt the radio messages.

Similarly, a hacker cannot force outputs by transmitting a radio message to a module without the
security key.

 A hacker cannot access the security key from an installed module or from the configuration files.
 The archived configuration files cannot be changed, downloaded or uploaded without the

password.

Warning!!
These security options provide a high level of security, but no data-security system can provide

“100% protection”. But it does make it very difficult for someone to interfere with the 905U
system - difficult to the point where there would be many easier alternate ways to cause
malicious damage.

The password must be kept in a secure place. Security procedures need to be adopted. If staff
with access to the password leave your organization, we recommend that the password be
changed.

We recommend that you use a random 8-character string for the security key and that you do
not record the key. It is not necessary to know what the security key is. The key will be recorded
in the archived configuration files, and therefore the configuration files should be held in a
secure place and backed up.

The security key does not prevent a hacker uploading a configuration from a module and
downloading with a new security key. This module will no longer operate with other modules in
the system. To prevent this, unauthorized access to modules must be prevented.

If you lose the configuration files, you can re generate these by upl oading the configuration from every
module in the system into a new project with a new security key. After uploading each module,
download the configuration with the new security key.

If you wish to change the security key, simply enter a new key in the configuration program, and
download the new configuration to all modules in the system.

Chapter Four Configuration

man_905-105_2.16 Page 55

4.3.8 Using 105S Modules

105S modules can be used by themselves, as “line telemetry” or “wired I/O”, or they can be used as
I/O expansion for 905U modules. As the 105S modules are connected by RS485, the 105S modules
can be separated from the 905U modules by some distance. There can be up to 32 addresses on the one
RS485 multi-drop link. Note that each –3 and –4 module takes up 2 addresses. For example, you
could have up to 32 modules sharing a multi-drop link if they are all –1 or -2 modules - if they are all
–3 or –4, then you could only have 16 modules on the link.

105S modules are configured with unit addresses in the range 96 – 127.

Example 1 - Mapping to another 105S module on the same link.

The I/O mapping is done in the same way as for 905U modules.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 56 © January 2011

Example 2 - Mapping to a remote 905U.

In this example, a 105S-2 is connected to 905U-1#8. DI1 is mapped to a remote 905U-C module. The
905U that is connected to the 105S module acts as a repeater - a serial-to-radio repeater.

When DI1 changes, the 105S will send a message via the serial link to 905U-1#8, and this 905U
module will repeat the message by radio to the 905U-C module.

Chapter Four Configuration

man_905-105_2.16 Page 57

Example 3 - Mapping to another 105S which is connected to a different 905U

In this example, both 905U
modules act as repeaters.
The first is a “serial-to­radio” repeater and the
second is a “radio-to-serial”
repeater.

105S-2

#97

905U-1

#8

905U-1

#9

105S-3

#102

AI1

AO1

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 58 © January 2011

Chapter Five SPECIFICATIONS

General

905U Radio standards FCC Part 15A, Part 15.247 902 – 928 MHz, 1W
105U Radio standards

FCC Part 90, Part 15, RSS­119

380 – 520 MHz, 12.5 / 25KHz, 0.5 – 5W

Housing 130 x 185 x 60mm

DIN rail mount

Refer section 5.1 for

dimensioned drawing

Powder-coated, extruded aluminium

Terminal blocks Removable Suitable for 2.5 mm2 conductors
LED indication Power supply,

OK operation, digital I/O,

RX and TX

Operating Temperature 905U, 105S

105U

-40 to 60 degrees C / -40 to 140 degrees F

-30 to 60 degrees C / -20 to 140 degrees F

Humidity 0 – 99% RH

non-condensing

Power Supply

Battery supply 11.3 - 15.0 VDC
AC supply 12 - 24 VAC, 50/60 Hz

Overvoltage protected

Battery required for 105U units with more

than 2W RF power

DC supply 15 - 30 VDC Overvoltage and reverse voltage protected

> 17VDC required for charging battery

Battery required for 105U units with more

than 2W RF power
Battery Charging circuit Included for 1.2-12 AHr sealed lead acid battery
Solar regulator Included Direct connection of solar panel (up to 30W)

and solar battery (100 Ahr)
Current Drain at 12VDC 85 mA quiescent for ‘U’

45 mA quiescent for ‘S’

+ 10 mA/active digital input

+ 25 mA/active digital output

+ 2 x analog I/O loop (mA)
Radio transmitter inrush 905U

105U

350mA @ 13.8VDC; 250mA @ 24VDC

450mA @ 13.8VDC (0.5W)

600mA @ 13.8VDC (1W)

800mA @ 13.8VDC (2W)

1.25A @ 13.8VDC (5W)

Analog loop supply Included, except -4 24V DC 150 mA

Chapter Five Specifications

man_905-105_2.16 Page 59

Mains fail status Monitored Can be transmitted to remote modules
Battery voltage Monitored As above
Radio Transceiver (905U)
Spread spectrum Frequency hopping
Frequency USA/Canada

Australia
New Zealand

902 – 928 MHz

915 – 928 MHz

922 – 928 MHz
Transmission Power 1W
Signal detect / RSSI -120 to –50 dBm
Expected line-of-sight range
(subject to local conditions)

20 miles + @ 4W ERP
15 km + @ 1W ERP

depending on local

conditions

USA / Canada

Australia / New Zealand

Range may be extended by up to 5

intermediate modules as repeaters
Antenna Connector Female SMA coaxial
Data transmission rate 19200 baud
Radio Transceiver (105U)
Fixed Frequency Channel spacing 12.5 / 25

KHz

380 – 400 MHz; 400 – 420 MHz;

420 – 440 MHz; 430 – 450 MHz;

450 – 470 MHz; 470 – 490 MHz,

490 – 512 MHz
Transmission Power Configurable 0.5 – 5W
Signal detect / RSSI -120 to –50 dBm
Expected line-of-sight range
(subject to local conditions)

70 miles @ 10W ERP
25 miles @ 2W ERP

depending on local

conditions

ERP allowed depends on license conditions

Range may be extended by up to 5

intermediate modules as repeaters

Antenna Connector Female SMA coaxial
Data transmission rate 905U

105U

19200 b/s

9600 b/s (12.5KHz); 19200 b/s (25KHz)
Serial Ports
RS232 Port DB9 female DCE 9600 baud, no parity, 8 data bits, 1 stop bit
RS485 Port 2 pin terminal block 9600 baud, no parity, 8 data bits, 1 stop bit,

Typical distance 1 mile / 2km
Data transmission On change-of-state

+ integrity update

Update time configurable

Protocol - serial

- radio

asynchronous ARQ, with

16 bit CRC
synchronous ARQ

Automatic acknowledgements with up to 4

retries

Communications fail status May be mapped to local or

remote output

Resetting of outputs on comms fail

configurable

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 60 © January 2011

Inputs and Outputs

Digital Inputs 905U/105S-1 Four

905U/105S-2 Four
905U/105S-3 None
905U/105S-4 Four plus 12

selectable I/O

Opto-

isolated (5000V)inputs, suitable for

voltage free contacts or NPN transistor,

contact wetting current 5mA, input debounce

0.5 second

For –4 modules, as above, but with 3000V

surge protection instead of opto-isolation

Digital Outputs 905U-1/105S-1 Four

Relay output contacts, normally open,

AC 5A 50V

DC 2A 30V, 5A 20V

Digital Outputs 905U-2/105S-2 One

905U-3/105S-3 Eight
905U-4/105S-

4 Four plus

12 selectable I/O

Pulse Inputs 905U-1/105S-1 One

905U-2/105S-2 Four
905U-3/105S-3 None
905U-4/105S-4 Four

Uses DI1. Max rate 100Hz, min. off-time

5msec.

Uses DI1-

4. Max rate of DI1 is 1000Hz,

min. off-time 0.5msec

Max rate of DI2-4 is 100Hz, min. off-time

5msec.

Pulse Output 905U-1/105S-1 One

905U-2/105S-2 None
905U-3/105S-3 Four
905U-4/105S-4 Four

FET output, 30 VDC 500mA max Max rate

for 105-1 is100 Hz. Max rate for 105-3 is

1000 Hz. Pulse signal recreated, pulse rate

avail. on analog output, (scaling

configurable).

Divide-by-10 available for 1000Hz inputs.
Analog Inputs “floating” differential input,

common mode voltage -

0.5V to 27V
905U-1/105S-1
Two 4-20 mA
905U-2/105S-2
Six 0-20mA

24 VDC for powering external loops

provided, 150 mA max. Digital filter time

constant 1 second (config.)

Resolution 15 bit, Accuracy 0.1%

Resolution 12 bit, Accuracy 0.1%

Analog Input Setpoints 905U-1/105S-1 AI 1 only

905U-2/105S-2 AI 1-4

Configurable high & low set-points, allowing

set/reset of remote digital outputs
Analog Outputs current sink to common

905U-1/105S-1
Two 4-20mA
905U-3/105S-3
Eight 0-20mA

max loop voltage 27V,

Resolution 15 bit, Accuracy 0.1%

Resolution 12 bit, Accuracy 0.1%

System Parameters

Chapter Five Specifications

man_905-105_2.16 Page 61

Network Configurations

Communications via radio

or RS485 or networ

k of

both

Up to 95 radio units with up to 32 serial units

off each radio unit

User Configuration

Any input to any output in

system

RS232 PC or laptop

Diagnostics

On board diagnostics

Automatic check on start-

up

Via RS232 terminal or

laptop

Input status

Output test

Incoming radio signal level

Simple radio path testing

5.1 Dimensioned Drawing

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 62 © January 2011

+AI

+AI

+24

DI DI DI

GN CO

DI

SUP SUP

DO DO DO DO AO AO

PO

ELPRO xxxx-x

RADIO TELEMETRY

165 mm

(6.5”)

190
mm

(7.5”)

60 mm

(2.4”)

35

mm

(1.4”)

130

mm

(5.1”)

82.5 mm

(3.25”)

55 mm (2.16”)

62 mm (2.45”)

Chapter Six Troubleshooting

man_905-105_2.16 Page 63

Chapter Six TROUBLESHOOTING

6.1 Diagnostics Chart

INDICATOR

CONDITION

MEANING

OK LED OFF

Continuously

• Battery Voltage low

• CPU failure

•

+24V supply failure/overload

OK LED ON Continuously

•

Normal Operation

PWR LED ON

Continuously

• Supply available from SUP1/SUP2

•

Supply available from solar panel

TX LED ON

Flashes briefly

•

Radio transmitting

RX LED ON

Flashes briefly

• Radio Receiving

•

Serial port communicating

RX LED ON

Flashes
continuously

• Module in Configuration Mode

RX LED ON

Continuously

•

Test Button press in Configuration
Mode

No transmission on change

of state

• Unit not configured correctly - re-

configure and check operation

The green OK LED on the front panel indicates correct operation of the unit. This LED extinguishes on
failure as described above. When the OK LED extinguishes shutdown state is indicated. In this state, all
digital outputs turn OFF and the +24V supply turns off.

On processor failure, or on failure during start-up diagnostics, the unit shuts down, and remains in
shutdown until the fault is rectified. The unit also shuts down if the battery voltage falls below 10.8 volts.
This is a protection feature designed to protect the battery from deep discharge in case of extended period
without supply voltage.

Note: During diagnostic testing, it is likely that the module will reset and restart. This will affect the
output signals.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 64 © January 2011

6.2 Self Test Functions

6.2.1 Input to Output Reflection (905U-1/105S-1 only)
The unit will require re-configuration after SELF TEST. Ensure you know the required

operational configuration including system and unit addresses so that the network can be
restored after testing.

Remove the cover in the front panel, and set the DIP switches as shown below. Hold down the red button
for five seconds, or until the Rx LED glows yellow, release the Red button (the Rx LED now flashes), then
press and release the Red button (the flashing Rx LED extinguishes).

0 0 0 0 0 0 0 0

1 0 0

0 0

0 0 0

Input signals may now be connected to the input terminals of the module. If the module is operating
correctly, then the input signals will be reflected t o the corresponding output on the same module. For
example, if DI 1 is connected to common - i.e. the first digital input is turned "ON" - then DO 1 will
activate, if the module is functional. Similarly, if a 12mA signal is connected to AI 2, then a 12mA
signal should be able to be measured from AO 2, if the module is functioning correctly.

If a module does not pass its self test function, then it should be returned to an author ised s ervi ce agent
for attention

6.2.2 Radio Testing using Tone Reversals (105U/905U modules only)

This function allows the unit to be configured to continuously transmit a sequence of alternate zeros
and ones on the radio. This function provides the facility to check VSWR of antennas during
installation, as well as checking the fade margin of the path between two units (see below - received
signal strength indication).

The tone rever sals function is initiated by se tting all of the DIL switches to ON, and holding down the
red button for approximately 5 seconds( until the RX LED lights continuously). On releasing the
button, the RX LED will flash continuously, and the TX LED will light, indicating that the radio
transmitter is on.

To finish the test, push the red button again or re-power the module.

6.2.3 Diagnostics menu

To aid in the checking and set-up of the module, a user friendly menu provides access to diagnost ic
functions. Use of the diagnostics menu does not affect module configuration.

Chapter Six Troubleshooting

man_905-105_2.16 Page 65

The diagnostics functions can be accessed from the E Series Config software - the same software
package used to configure the modules. Connect the laptop or PC to the module using a configuration
RS232 cable.

Either open the archived project containing the module, or start a New Project and select “Load a New
Unit” - select the correct type of module. After the unit has loaded, select the Diagnostics box.

A “Terminal” screen will appear. Select the “Terminal” box.
Connect the module (ensure the RS485 port is disconnected first) to the PC using the same serial cable

Select for Diagnostics

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 66 © January 2011

used for configuration.
The diagnostics menu is accessed by removing the blue “plug” from the front of the module and setting

all switches to ‘0’ or “Open”, and holding down the red button for approximately 5 seconds, until the
RX LED lights continuously. One of the following menus will be displayed on the terminal :

1051 V1.0

a) Ins
b) Tones
c) Comms
d) DO1
e) DO2
f) DO3
g) DO4
h) AO1
i) AO2
j) Switch
k) Signal
>

1052 V1.0
a) Digital Ins

b) Analog Ins
c) Tones
d) Comms
e) DO1
f) Switch
g) Signal
>

1053 V1.0
a) Ins
b) Tones
c) Comms
d) DO1
e) DO2
f) DO3
g) DO4
h) DO5
i) DO6
j) DO7
k) DO8
l) AO1
m) AO2
n) AO3
o) AO4
p) AO5
q) AO6
r) AO7
s) AO8
t) Switch
u) Signal

>

1054 V1.0
a) D Ins
b) A Ins
c) Tones
d) Comms
e) DO1
f) DO2
g) DO3
h) DO4
i) DIO1
j) DIO2
k) DIO3
l) DIO4
m) DIO5
n) DIO6
o) DIO7
p) DIO8
q) DIO9
r) DIO10
s) DIO11
t) DIO12
u) Signal
>

Choose an item from the menu by entering the letter before that item. For example, to select the
"Signal" function from the 105-1 Menu, enter :- k

During the diagnostics session, if you press Enter or Space while the menu is displayed, the module
will restart in normal operating mode. To re-enter diagnostics mode, hold the red button for 5 seconds
etc.

After the diagnostics session is over, force the module to restart, then select “Stop Terminal”, then
“Close”.

Inputs

This option provides a dynamic display of the status of all of the inputs i n the 905U, both internal and
external.

Chapter Six Troubleshooting

man_905-105_2.16 Page 67

905U-1/105S-1 Modules
1234MLS P CNT AI1 AI2 PRATE VBATT
0101001 00F6 C000 4000 8000 9C00
The first 7 values (1234MLS) each represent a single digital input. A ‘1’ indicates that that input is

ON, and a ‘0’ indicates that the corresponding input is OFF. "1234" represents the four physical digital
inputs, DI1 to DI4. "M" is the mains fail status (‘1’ for mains fail, ‘0’ for mains OK). "L" is the battery
low volts status (‘1’ for low volts ‘0’ for OK). "S" is the set-point status. Note ‘M’ indication will also
come on when a solar voltage above approx 10.5V is connected to the Solar Terminal.

P CNT, AI1, AI2, P RATE, and VBATT each represent 16 bit values, displayed as four hexadecimal
digits.

P CNT is the current value of the pulsed input counter. This value should increment each time ‘DI 1’
turns from OFF to ON. P RATE displays the current pulse rate at DI1. This value is scaled according
to the MAXRATE value configured (0 Hertz is displayed as 4000, and the maximum rate is displayed
as C000).a

AI1 and AI2 represent the value for the two analog inputs. Full scale input (20 mA) is displaye d as
C000, 4mA is displayed as 4000, and 0ma is displayed as 2000. Analog inputs are filtered digitally
with a time constant of 1 second, so a sudden change in the analog input current will result in a slower
change in displayed analog value, finally settling at the new value.

A guide to translate the displayed value to the analog input current is provided below.

Add together the figures corresponding to each digit in each position to

determine the current (mA)
e.g. displayed value 3456 = 2.000+0.500+0.039+0.003

= 2.542mA

Digit

Leftmost

position

Next position

Next position

Rightmost

position

0

-

0.000

0.000

0.000 1 -

0.125

0.008

0.000

2

0.000

0.250

0.016

0.001

3

2.000

0.375

0.023

0.001

4

4.000

0.500

0.031

0.002

5

6.000

0.625

0.039

0.002

6

8.000

0.750

0.047

0.003

7

10.000

0.875

0.055

0.003

8

12.000

1.000

0.063

0.004

9

14.000

1.125

0.070

0.004

A

16.000

1.250

0.078

0.005

B

18.000

1.375

0.086

0.005

C

20.000

1.500

0.094

0.006

D

22.000

1.625

0.102

0.006 E -

1.750

0.109

0.007 F -

1.875

0.117

0.007

VBATT is the current internally derived battery voltage. 4000 corresponds to 8 Volts, C000 represents

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 68 © January 2011

16 volts. A quicker method is use the calculation:
Battery voltage (volts) = ½ I + 6, where I is the mA value determined from the above table using

VBATT. For example, a value of VBATT of A000 gives an I value of 16mA from the above table.
The battery voltage corresponding to this is 14V (or ½ x 16 + 6).

905U-2/105S-2 Modules
Digital Inputs

DIN SETPNT PULSED
1234MSL123456 PIN1 PIN2 PIN3 PIN4
0000100111111 0000 0000 0000 0000

Note ‘S’ indicates Solar Voltage is present. Indication will come on at approx 10.5V.
Note ‘M” only indicates if a DC supply is connected to SUP1/SUP2 &GND. Does not indicate Solar

Supply like the 105/905-1 module.

Analog Inputs

VBAT PR1 PR2 PR3 PR4 AI1 AI2 AI3 AI4 AI5 AI6
8138 4000 4000 4000 4000 0D3A 0CD2 0CC7 0CC7 0CD4 0CC7

905U-3/105S-3 Modules
ML VBAT VSLR

00 9FA2 0000
Note ‘M’ indication will also come on when a solar voltage above approx 10.5V is connected t o the

Solar Terminal.
‘VSLR’ will indicate the solar voltage – Range is 8 to 20V

905U-4/105S-4 Modules
Digital Inputs

DIN DIO PULSED
1234 123456789ABC MLS PIN1 PIN2 PIN3 PIN4
1001 010101010 001 101 0001 0001 0001 0001

Analog Inputs

VBAT PR1 PR2 PR3 PR4
8DBE 0000 0000 0000 0000

Tones (905U modules only)
This provides the same function as described above in 6.2.2. Tone Reversals. This function may be

used to check VSWR of antennas, and may be used in conjunction with the Signal opti on (described

Chapter Six Troubleshooting

man_905-105_2.16 Page 69

below) to check the path between two units.
Comms
This function allows monitoring of all messages transmitted and received over the radio. A better

comms display function is available using the “Comms Logging” feature in the configuration software

- refer to section 6.2.4.
Transmitted messages are displayed starting in the leftmost column of the display. Received messages

are displayed with the received signal strength preceding the message. The first four hexadecimal digits
are the system address attached to the message, and must match for units to communicate successfully.

The received signal strength is in negative dBm - the lower the measurement, the stronger the radi o
signal. A measurement larger than 95 indicates a weak radio signal.

Example:
>c

Comms
TX: 01FA8106008005C6727D44 Command message transmitted by this unit.
84 01FA8186C6E0E3 Acknowledge received from remote.
81 01FA860100800100009286 Message received from remote unit.
TX: 01FA868100FCE4 Acknowledge message from this unit to remote.

<INVALID> 01FA860000800100009286 Corrupted message received.

DO1 to DO8, DIO1 to DIO12
These options allow the user to set and clear digital outputs. To set an output, select the corresponding

menu item, at the prompt, type the value FFFF to turn the output ON, or 0000 to turn the output OFF.
For example, to set DO1 ON,

>e
DO1
>FFFF

AO1 to AO8

These options allow the user to set analog outputs to any value. To set the output, select the
corresponding menu item. At the prompt type the value required for the analog output as a four digit
hexadecimal value. Refer to the table above for analog current/expected value relationship. To set AO2
on 105-3 to 19 mA :

>m
AO2
>B800

Switch

This option allows testing of the DIL (Dual In Line) switches. The diagram below indicates the layout

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 70 © January 2011

of the switches of which there are two sets of eight, with an “Enter” button located to the right of the
pair. the display indicates the current switch settings with the digit ‘1’ corresponding to ‘On’ and the
digit ‘O’ corresponding to ‘Off’. Changing the switch settings in this mode will change the display.
Test each switch and check to ensure the display changes accordingly.

Switches

Displayed

1110001001010101

Signal

This option provides for testing the radio path between two units for a suitable reliability margin.
Although a pair of units may communicate successfully, radio communication may be affected by a
range of influences, including atmospheric conditions, changing lands cape, degradation of antennas or
co-axial cable, low battery voltage etc. “Fade margin” is an indication of how far a radio path can
deteriorate before communication becomes unreliable.

When using the Signal feature, the current received radio signal level is displayed in negative dBm
(dBm is relative to 1mW of RF power). A display of 100 means –100dBm. This means that a stronger
signal will have a lower measured value.

For 105U fixed-frequency units, the signal level is displayed as a scale - refer to the end of this
section.

To check the radio path between two units, select the signal option at the local unit. The display will
initially show the background noise of the radio band. Determine the approximate average of the noise
level. The remote unit may then be set up for tone reversals (refer 1 above). Determine the
approximate average of the received signal strength. It is normal for the measured values to
continually change - the radios are continually changing frequency. Calculate the best average for
both the noise and signal. For a reliable radio path, the signal strength must be at least 10dB lower than
the noise level, or 98, whichever is less.

For example, if the noise level is 120, then the radio signal must be 98 or lower for a reliable path. If
the noise level is 100, then the radio signal must be 90 or lower.

A simpler method when remote units are not easily accessible is to cause a transmission from the local
unit to the remote unit (by setting a digital input which maps to the remote unit, for example). The
meter will latch the received signal from the remote unit for half a second, allowing the received level
to be read.

If any obstructions in the radio path are likely to change, then this should be allowed for. For

1 1 1 0 0 0 1 0

0 1 0 1 0 1 0 1

Chapter Six Troubleshooting

man_905-105_2.16 Page 71

example, if the radio test is done during winter and the radio path is through trees without leaves, t hen
another 10dB of margin should be allowed for to cover summer conditions when the trees have leaves.

When using directional antennas (i.e. YAGI antennas) this feature may be used to peak the received
signal level. Set-up the remote unit to transmit tone reversals as described above, and observe the
signal indication while adjusting the orientation of the antenna. A peak in signal level indicates
optimum orientation of the antenna.

105U Fixed Frequency Units

The received signal strength is displayed as a horizontal meter scale.
0123456789----

#
Under normal radio conditions, a reading of 0 indicates a very marginal communication path. For

reliable communications, the signal reading should be 3 or above.
In areas experiencing radio interference or high background noise, reli able communications may not be

achievable even with this signal level. To determine if interference is occurring the si gnal option may
be selected without any other 105 units active. In a normal radio environment, no reading should be
displayed. If a reading is displayed, then the received signal strength from the remote should be at
least two counts higher than the background noise for reliable communication.

>k Displayed signal level of
Signal background noise/interference
0123456789----

#
>k Minimum signal level for reliable comms
Signal
0123456789----

#
The following table converts the indicated scale to a dBm value.

Scale

0 1 2 3 4 5 6 7 8 9 10

-dBm

-110 -106 -102 -98 -94 -90 -86 -82 -78 -74 -70

6.2.4 Comms Logging

These options allow logging and display of radio communications. To start “Comms logging”:

• select option the “Comms” option from the diagnostics menu (see section 6.2.3),

• select ‘Stop Terminal’ and then

• select ‘Start Comms’.

The display will show radio messages transmitted and received. Messages starting with TX are
transmitted messages, and received messages start with a small line indent. At the end of each
received message is the RSSI (radio signal strength) in dBm.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 72 © January 2011

If you select any message line with the mouse, information about the message will be displayed at the
bottom of the screen - the system address, RSSI and CRC (error-check) status. The “text box” at the
bottom middle of the screen decodes the message - that is, it decodes the message to display I/O
channel and value.

You can display the register values in Decimal by selecting “Dec” at the bottom of the screen. If you
select “Dig”, the values will be displayed as a 0 or 1 digital value (1 if the 16-bit value is greater than
50% - that is, the most significant bit is 1). If you select “Anlg”, the value will be displayed as a 4­20mA range.

To stop “comms logging”, select the “Stop Comms” box. You can then shut down the diagnostics
screen, or select “Terminal” to go back to the diagnostics menu.

Add Time Stamps

Time stamps can be added by selecting the “Time Stamps” box. This will allow the current time and
date to be displayed with each message. The “Comms log” can be saved to a file for future reference
by selecting “Log to File”.

Chapter Six Troubleshooting

man_905-105_2.16 Page 73

6.3 Radio Path Testing

To carry out a radio path test, you will need two 905U modules. One module will be “fixed” and the
other “mobile”. Both units will need power supplies and antennas. The power supply for the mobile
unit is normally a 12V battery, but make sure that the battery is fully charged - batteries with low
voltage will lead to low radio power which will affect the test result.

The object of the test is to determine whether radio paths are reliable, marginal or unreliable. A
reliable path will have a margin of at least 10dB above the background noise level in good weather -
this margin is enough to ensure that the radio path remains reliable in poor conditions. A marginal path
will work reliably in good conditions, however will fail during poor conditions. If the test is carried
out during rainy or foggy weather, then a margin of only 5dB is required.

Procedure:

 Configure the modules to the same system address, and on each module, configure DI1 to DO1 on

the other module. At the fixed module, wire DO1 to DI1 such that DI1 will turn ON when DO1
turns ON. Connect a switch to DI1 on the mobile unit.

 When the modules are close to each other, test the system - close the switch, forcing the mobile

unit to transmit. The mobile unit will transmit to the fixed unit, and the fixed unit will transmit
back to the mobile unit, activating DO1. Turning off the switch will result in two radio
transmissions, turning off DO1. Each time the switch is changed, there should be two radio
messages (two sets of TX/RX flashes) at the mobile unit. Note that when the modules are within a
couple of metres, they may not work well with antennas connected - in this case, test without
antennas.

 Set up the fixed module in one of the test positi ons - this is normally at a control centre or repeater

site. Fix the antenna in a temporary fashion. You will need to make an initial assessment on how
high the antenna should be mounted.

 Take the mobile module to the other end of the radio path. The antenna at this end can be either

held by the tester, or fixed in a temporary fashion. Note that a person’s body will affect the
radiation pattern of an antenna, so if the antenna is hand-held and the test is not successful, try
again with the antenna fixed to a 1 metre length of plastic pipe or timber. The tester holds the
length of pipe or timber with the antenna above head height.

 Test the radio path by operating the switch. If the radio path is short, and there is a high level of

confidence that the radio path will be r eliable, the result can be checked by simply looking at the
TX/RX leds on the mobile unit. If each TX flash is followed immediately by a RX flash (that is,
the TX flash does not flash twice or more times before the RX flashes), then the radio path is
likely to be reliable. Operate the switch several times - do not rely on one test. If the test is being
done outside, the leds will need to be shaded to view the flashes.

 If the radio path is uncertain, the n the result should be measured by connecting a laptop computer,

following the procedure outlined in this manual for measuring the radio signal strength. Before the
switch is operated, the background noise level should be measured and recorded. This
measurement is likely to “jump around” or oscillate, to determine an average measurement. Now
operate the switch several times - take the average measurement of the signal transmitted from
the fixed unit.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 74 © January 2011

 The radio path is reliable if the transmitted signal is 10dB above the noise level, or better than –

98dBm. For example, if the noise level is –115dBm, then the minimum level for reliability is –
98dBm. If the noise level is –100dBm, then you need –90dBm for a reliable path. If the laptop
displays a scale measurement instead of a numerical measurement, then the transmitted signal
should be at least 3 divisions, and at least 2 divisions above the noise level.

 If the weather is poor during the test , then t he tr ansmitted signa l needs to be 5dB above noi se, or 1

division. It is best not to do radio tests during poor weather.

 Record these measurements for comparison later during commissioning or if the system has

problems later.

If the radio path test is not successful:

1. Increasing the hei ght of the antenna at either module, or at bot h modules can significantly improve

the result. Sometimes moving the antenna to the side helps , if there is an obvi ous obst ruct ion in t he
radio path.

2. Change one or both antennas to a higher gain if regulations allow.

3. Use a shorter coaxial cable between the antenna and the 905U.(this may involve moving 905U

nearer to antenna mounting), or use a different coaxial cable with lower loss.

4. If a reliable radio path is not possible because of distance or path obstructions, you will need to

consider using a repeater module. The ideal repeater is another module in the system, in a good
location to act as a repeater. If this is not the case, you need to consider installing a module to act
specifically as a repeater.

Appendix B Terminal Layouts

man_905-105_2.16 Page 75

Chapter Seven WARRANTY & SERVICE

We are pleased that you have purchased this product.
ELPRO products are warranted to be free from manufacturing defects for the “serviceable lifetime” of

the product. The “serviceable lifetime” is limited to the availability of electronic components. If the
serviceable life is reached in less than three years following the original purchase from ELPRO,
ELPRO will replace the product with an equivalent product if an equivalent product is available.

This warranty does not extend to:

- failures caused by the operation of the equipment outside the particular product's specification, or

- use of the module not in accordance with this User Manual, or

- abuse, misuse, neglect or damage by external causes, or

- repairs, alterations, or modifications undertaken other than by an authorized Service Agent.
ELPRO’s liability under this warranty is limited to the replacement or repair of the product. This

warranty is in lieu of and exclusive of all other warranties. This warranty does not indemnify the
purchaser of products for any consequential claim for damages or loss of operations or profits and
ELPRO is not liable for any consequential damages or loss of operations or profits resulting from the
use of these products. ELPRO is not liable for damages, losses, costs, injury or harm incurred as a
consequence of any representations, warranties or conditions made by ELPRO or its representatives or by
any other party, except as expressed solely in this document..

Full product specifications and maintenance instructions are avai lable from your Service Agent, your
source of purchase, or from the master distributor in your country upon request and should be noted if
you are in any doubt about the operating environment for your equipment purchase

In the unlikely event of your purchase being faulty, your warranty extends to free repair or replacement
of the faulty unit, after its receipt at the master distributor in your country. Our warranty does not
include transport or insurance charges relating to a warranty claim.

Should you wish to make a warranty claim, or obtain service, please forward the module to the nearest
authorised Service Agent along with proof of purchase. For details of authorised Service Agents,
contact your sales distributor.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 76 © January 2011

Appendix A SYSTEM EXAMPLE

The following example of a system is a comprehensive guide to using some of the features of the
range and design of system.

The example application is a pump station which supplies water from a reservoir to a tank station.
Signals are transferred between the pump station and tank station by radio - the distance between the
two stations is 10 km (6 mile), and the radio path is heavily obstructed by buildings and trees. A
control station is located near the pump station, and there is an existing signal cable between the
control station and the pump station.

A 905U-1 module is installed at the pump station (with address 1) and a 905U-2 module is installed at
the tank station (with address 2). Because the signal cable to the control station does not have enough
cores for all of the signals required, the signal cable is used as a RS485 cable and a 105S-3 module is
installed at the control station (with address 96). As this module has an address greater than 95, the
905U-1 at the pump station will communicate to it via its serial port.

The following diagram represents the system :-

905U-1

#1

905U-2

#2

105U-3

#96

Appendix B Terminal Layouts

man_905-105_2.16 Page 77

The following design points should be noted :-

• A test of the radio path between the pump station and the tank s tation indicated that the radio path

would be reliable provided antennas were installed at 6 m above the ground. At each site, the
coaxial cable would be approx 30 feet in length, so it was decided to use 6 element Yagi antennas
with RG58 coaxial cable - the Yagi antennas would compensate for the loss in the cable.

• At the tank station, there was an existing light pole with a mains power supply - the light pole was

10m high. Permission was obtained to mount the antenna from the pole and to use the power supply
for the radio telemetry module.

As there was no existing electrical panel at this station, a small steel enclosure was installed on the
light pole. A 2 Amp-Hour sealed battery was installed to provide power during any mains failure.
The flow and level transducer were powered from the 24VDC loop supply provided by the module.

• At the pump station, the antenna was mounted on a 10’ J-bracket installed on the roof of the pump

station building. The final height of the antenna was approx 20 feet. Care was taken to align the
Yagi antennas so they pointed at each other. The Yagi antennas were installed with horizontal
polarity - that is, with the elements horizontal. These antennas will not "hear" other radio users on
the same radio channel which generally use vertical polarity.

There was an existing electrical enclosure at the pump station, and the 905U module was installed
inside this enclosure. The module was powered from a 24VDC supply with a 2 Amp Hour sealed
battery as backup.

• At the control station, the 105S module was installed inside the exist ing control panel enclosure.

The module was powered from an existing 24VDC power supply.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 78 © January 2011

Tank Station Configuration

The 905U-2 module has the following configuration :-

Note the following points in the configuration :

• #1 is a repeater for communications between #2

and #96

• The pulse rate scaling for PIN1 has been set to 5

Hz to match the maximum flow rate of the flow
meter. Note that PIN1 has not been configured for

Appendix B Terminal Layouts

man_905-105_2.16 Page 79

"divide by 10" (for 1000 Hz pulse signals).

• AIN1 (the level transducer) is mapped to AO1 at the 905U-3. The analog debounce has been set to

2 sec. This is because of concern of wave action on the surface of the tank causing un-necessary
change transmissions. This debounce time will also operate on the Pulse Rate value, but as the flow
rate changes slowly, this will not affect the performance of this signal.

• SETPOINT1 (the set-point status for AI1) is mapped to DO2 of #1 (pump station). The set-point

values for this setpoint have been set to 40% and 75%. When the tank level drops to 40%, DO2 at
the pump station will activate to start the pump. When the level rises above 75%, DO2 will reset to
stop the pump.

• The update time for SETPOINT1 has been changed to 5 minute, as required.

• An additional mapping has been entered - LOW VOLT has been mapped to DO7 at #96 via #1

(DO7 at the control station). This mapping is for future use - it will provide a low battery voltage
alarm for the tank station. The update time for this mapping has been set to the maximum time of
15 minutes to reduce loading of the radio channel.

• A Start-up poll has been configured for #1, as DO1 at the tank station is controlled from the pump

station. Note that no comms fail reset time has been configured for DO1. As this output drives an
indication only, the indication will show the last correct status even during communication failures.

Pump Station Configuration

The 905U-1 module has the following configuration :-

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 80 © January 2011

Note the following points in the

configuration:

• Note that no repeater address is necessary

between #1 and #96.

• DIN2 (pump running signal) has two

mappings - a mapping to DO1 at #2 (tank
station) and DO2 at #96 (control station).
When DIN2 changes, there will be two
separate change messages transmitted -
one by radio to #2 and one by serial link to
#96.

• AIN1 (pump amps) is mapped to AO3 at #97 (control station).

• An additional mapping has been entered - LOW VOLT has been mapped to DO8 at the control

station. This mapping is for future use - it will provide a low battery voltage alarm for the pump
station.

• A Start-up poll has been configured for #2, as DO2 at the pump station is controlled from the tank

station. Note that a comms fail reset time of 11 minutes has been configured for DO2. This means
that if a message has not been received for DO2 within 11 minutes, DO2 will reset and switch off
the pump. The 11 min time was chosen as it means that two successive update messages have to be
missed before the pump is reset, and there is no problems if the pump runs for 11 minutes during a
system failure (the tank will not overflow during this time).

Control Station Configuration

The 105S-3 module has the following configuration :-

Note the following points in the configuration :

• The only mappings are Start-up polls. Note that there are two separate polls, one for each remote

module.

Appendix B Terminal Layouts

man_905-105_2.16 Page 81

• PO 3 has been configured as a PO. Its pulse

output update time is the same as the PI update
time at the remote module (both have been left
at their default value of 1 minute).

• Reset times have been selected for the analog

outputs (21 minutes) but not the digital outputs.
In the event of a system failure, the digital
outputs will stay at their last correct status, but
the analog outputs will reset to 0 mA.

System Failure Alarm

After the system had been running for some
time, the operators wanted a "system failure"
output at the control station, to warn the
operators that there was a fault with the system.

The following configuration was added :
At #2 (tank station), Inverse DI4 → DO4 at

#96 via 1 ; DI4 Update time = 1 minute
At #96 (control station), DO4 Comms fail

reset time = 3.5 min
At the control station, DO4 was a "system

OK" signal. It was normally active - if the
signal reset, then this represented a system
failure. At the tank station, there is no signal
wired to DI4. By mapping Inv DI4 to DO4 at
the control station, a message is transmitted
every minute to this output to activate it. The
message is transmitted via the radio link to #1,
and then by the serial link to #96. If anything happened t o eit her module #2 or module #1, or the radi o
link, or the serial link, then the update messages for DO4 will not be received at the control station
module. After 3.5 Minutes, DO4 will reset indicating a problem.

The time of 3.5 minutes was selected as this means that 3 successive update messages have to be
missed before a system alarm occurs. Also note, that if module #96 fails, DO4 will reset and give an
alarm signal.

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 82 © January 2011

Appendix B TERMINAL LAYOUTS

-

+AI 2

-

+AI 1

+24V

DI 3

SOL

DI 2

DI 1

GND

COM

DI 4

SUP2

SUP1

BAT+

DO 1 DO 2

DO 4

DO 3

GND

+24V

AO 1

AO 2

PO

1

2

3

4

OUTPUTS

1

3

4

INPUTS

ELPRO xxxx-1

WIRING DRAWING - 105U-1, 905U-1 105S-1

Appendix B Terminal Layouts

man_905-105_2.16 Page 83

-

+AI 2

-

+AI 1

+24V

DI 3

SOL

DI 2

DI 1

GND

COM

DI 4

SUP2

SUP1

BAT+

AI 3+

AI 4+

AI 6+

AI 5+

GND

+24V

DOT

COM

COM

OUTPUT

1

3

4

INPUTS

ELPRO xxxx-2

WIRING DRAWING - 105U-2, 905U-2 105S-2

905U Wireless I/O Module User Manual
105S Serial I/O Module

Page 84 © January 2011

DO 3

SOL

DO 2

DO 1

GND

COM

DO 4

SUP2

SUP1

BAT+

GND

AO 6

AO 7

AO 8

1

2

3

4

OUTPUTS

1

3

4

OUTPUTS

ELPRO xxxx-3

COM

COM

DO 5

DO 6 DO 7 DO 8

+24V

AO 5

+24V

AO 1

AO 2

AO 3

AO 4

+24V

WIRING DRAWING - 105U-3, 905U-3, 105S-3

Appendix B Terminal Layouts

man_905-105_2.16 Page 85

OUTPUTS

ELPRO xxxx-4

DIO9

DIO10 DIO11

DIO12

DIO8

DIO7

COM

DO 4

DO 3

DO 2

DO 1

SOL

GND

BAT+

I/0

INPUTS

I/0

DIO3 DIO4

DIO5

DIO6

DIO2

DIO1

COM

DI 4

DI 3

DI 2

DI 1

GND

SUP2

SUP1

WIRING DRAWING - 105U-4, 905U-4, 105S-4