Walker Easy-RTU Quick guide

BUILDING INTELLIGENCE WORLDWIDE
INSTALLATION, WIRING & CONFIGURATION
Easy-RTU
(Wireless Roof Top Unit Controller)
REVISION 1FORM # WW03-709

Easy-RTU Installation, Wiring & Conguration Guide
WW03-709
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BackFront
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Front with Back removed
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Overview
The Easy-RTU is a wireless controller designed to control Roof Top units within a Walker Wireless mesh
network. Dierent algorithms can be programmed into the Easy-RTU for a variety of dierent applications.
The Easy-RTU features a setpoint knob in Celsius, built in motion detection, a room temperature sensing
thermistor with Walker Temperature Predicting Software and four inputs for additional sensors (CO2, door,
return air Temperature, etc…). There are 8 digital outputs and 2 analog outputs to control a variety of Roof
Top units.
Features
1.Motion indication LED – When the Easy-RTU has detected motion the LED turns on.
2.Motion detector – Make sure the motion detector is never obstructed or covered.
3.Setpoint Knob – Adjust the Setpoint Knob to the desired room temperature.The minimum and
maximum allowed temperature can be adjusted in the Easy-RTU.
4.Radio Programming Header – This header is to program the onboard radio and should never be
used for programming in the eld.
5.Processor Programming Header – If a dierent algorithm is to be used or the settings are being
changed via Easy-TOOL use this header to reprogram the processor.
6.Shrouded Connection Header – This connection header connects the front of the Easy-RTU to the
I/O Board connected to the back of the Easy-RTU.
7.Input Range Settings – Used to select the type of device connected to the Inputs of the Easy-RTU.
8.Communication Port – Used to view and change all settings locally in the Easy-RTU.
9.I/O Terminal Block – All connections to the Easy-RTU are made through this Terminal Block.

Easy-RTU Installation, Wiring & Conguration Guide
WW03-709
Motion Detector
The built in motion detector allows the Easy-RTU to turn down the Setpoint when no bodies are detected in
the zone. The motion detector has a range of 10 meters at a viewing angle of 150 degrees.
Below are the settings pertaining to the motion detector:
TM_MOTN
Is the amount of time in minutes to wait after no motion is detected before changing the Setpoint to
unoccupied.
STSAV_H
The heating Setpoint to control to when the TM_MOTN time has expired and the Easy-PTAC goes into
unoccupied mode.
STSAV_C
The cooling Setpoint to control to when the TM_MOTN time has expired and the Easy-PTAC goes into
unoccupied mode.
When motion is detected, the Easy-PTAC will revert back to knob Setpoint for control. When no motion is
detected for the specied time the Easy-PTAC will go into unoccupied mode.
Make sure not to block or limit the vision of the motion detector. If the motion detector can not see motion
it will always control to the no motion setpoint (STSAN_H OR STSAV_C).
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Easy-RTU Installation, Wiring & Conguration Guide
WW03-709
Power Requirements
The Easy-RTU requires 24VAC and draws a maximum of 3VA to operate when fully loaded. Ensure that one
side of the 24VAC is grounded to Earth ground.
Hardware Conguration
The I/O Terminal Block is where all connections to the Easy-RTU are made. Below is a breakdown of the
Terminal Block connections.
24VAC - Connect 24VAC to this connection.
GND - Connect this to the Earth Ground side of the 24VAC
transformer.
COMMON 1,2,3,4 - The common between DO 1,2,3 and 4.
DO1 - Normally open relay. Shares a common with DO 2,
3 and 4.
DO2 - Normally open relay. Shares a common with DO 1,
3 and 4.
DO3 - Normally open relay. Shares a common with DO 1,
2 and 4.
DO4 - Normally open relay. Shares a common with DO 1,
2 and 3.
COMMON 5,6,7,8 - The common between DO 5,6,7 and 8.
DO5 - Normally open relay. Shares a common with DO 6,
7 and 8.
DO6 - Normally open relay. Shares a common with DO 5,
7 and 8.
DO7 - Normally open relay. Shares a common with DO 5,
6 and 8.
DO8 - Normally open relay. Shares a common with DO 5,
6 and 7.
OP1 - Analog output.
OP2 - Analog output.
IP2 - Input for an external sensor.
IP3 - Input for an external sensor.
IP4 - Input for an external sensor.
IP5 - Input for an external sensor.
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Easy-RTU Installation, Wiring & Conguration Guide
WW03-709
Inputs
The four inputs are jumper congurable for multiple device types. These allow many dierent types of
external sensors to be connected to the Easy-RTU (i.e. CO2 sensor, Door contact switch, window switch,
etc...).
10V - For sensors that produce 0 to 10VDC as a signal.
5V - For sensors that produce 0 to 5VDC as a signal.
I- For sensors that produce 4 to 20 mA as a signal
T - For a 3K NTC type thermistor or a contact closure.
In the picture above IP2 is congured for a 0-5V input, IP3 is congured for a 3K thermistor IP4 is congured
for a 4-20mA input and IP5 is not congured for any input.
Caution: Make sure the jumper settings are correct for the input type into the Easy-RTU. Damage may occur
if these settings are incorrect.
Outputs
Digital Outputs (DO)
There are 8 Digital Relay Outputs on the Easy-RTU. The 8 DOs are split into 2 banks of 4, each bank sharing
a Common Ground. Depending on the algorithm programmed, each DO will serve a dierent purpose. The
voltage can not exceed the maximum ratings:
24VAC @ 1.2A
30VDC @ 1.2A
Analog Outputs (OP)
There are 2 Analog Outputs on the Easy-RTU. Depending on the algorithm programmed, each OP will serve
a dierent purpose. Each OP is capable of 0-5VDC, 0-10VDC, 2-10VDC or 4-20mA (with an external 500Ω
resistor in series with the OP). The maximum current each OP can source is 20mA.
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Easy-RTU Installation, Wiring & Conguration Guide
WW03-709
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Software Conguration
Easy-TOOL
To connect the Atmel AVRISP mkII programming dongle to the Easy-RTU, connect the ribbon cable header
from the AVRISP mkII to the Easy-RTUs processor programming header as shown in the picture below. If
corrected correctly the LED on the AVRISP mkII will turn green. Please see the Easy-TOOL user guide on how
to program through the Atmel AVRISP mkII.

Easy-RTU Installation, Wiring & Conguration Guide
WW03-709
Communication Port
The communication port on the base of the Easy-RTU allows all settings to be changed locally via a terminal
program on a computer.
To connect the Easy-RTU to a computer for local changes a Cable-ROOMSTAT and DB9F6 (Both from Walker
Technologies Corp.) are required. Connect the 3-pin end of the Cable-ROOMSTAT to the communication port
on the base of the Easy-RTU with the painted white strip facing the corner of the Easy-RTU. Connect the
RJ12 end of the Cable-ROOMSTAT to the DB9F6 and then connect the DB9F6 to an available comm. port on
the computer or an USB to Serial adapter.
The appropriate settings must be set in the terminal program used for proper communication to the Easy-
RTU. The settings are:
- Bits per Second: 9600
- Data bits: 8
- Parity: None
- Stop Bits: 1
- Flow Control: None
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DB9F6
Cable-ROOMSTAT
To comm. port or
USB to serial adapter

Easy-RTU Installation, Wiring & Conguration Guide
WW03-709
Terminal Screen
The terminal screen can be broken down into 4 sections:
1. Detailed Object data – Lists all information about each object in the Easy-RTU
2. Control Overview – Displays a summary of all the control points for the Easy-RTU
3. Radio Overview – Displays a summary of the radio settings
4. Selected Object – Displays the current selected object for changing
Refer to Appendix A for detailed information on each object type.
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Easy-RTU Installation, Wiring & Conguration Guide
WW03-709
Object Breakdown
Each object is listed with an abundance of information.
10 Object number.
s If there is a lower case“s”the object can be commanded in GCL, if it is mapped to a point.
USED_HT The name of the object.
25.0 The current value of the object.
A Displays if the object is in control by software (Auto “A”) or has been set by a user (Manual “M”).
LIf an “L”is displayed the objects value was written by the rmware in the Easy-RTU.
If an “S”is displayed the objects value was written by GCL.
emlt
If an “e”is displayed SUPEREANBLE is on and allows GCL to command the object.
If an “m”is displayed SUPERMANUAL is on and the object can be commanded in manual mode.
If an “l” is displayed SUPERLOCAL is on and GCL is able to command objects displaying “L”.
If a “t” is displayed TIMEDMANUAL is on and the point will revert to auto after the time set in
EC_T_SUPER expires when command to manual (Physical Outputs only).
V2
The point the object will be mapped to in the Walker System. Displayed by a single letter (point
type) followed by the point number (0-9).
V – VA point
C – VC point
F – VF point
I – IP point
O – OP point
0
Count down timer. If the object was command by GCL or a Physical Output was command to
manual, this displays the time left in minutes until the command is overwritten by the pervious
value. Time is set in EC_T_SUPER.
Navigating Through the Terminal Screen
The keyboard and arrow keys are used to navigate through the terminal screen and change objects.
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(Left Arrow) Used to select the current displayed object.
(Right Arrow) Used to set the current setting to the selected object.
(Up/Down Arrows) Scroll through objects and change values on selected objects.
(Enter/Return) Cancel the change to an object or return to the object from its status menu.
“Q” Writes settings to the radio.
“W” Reads the settings from the radio.
“N” Causes the radio to dump its Channel and Operational PAN ID and search for
the network again.
Other Letters Pressing a letter other than the 3 listed above will cycle through objects
starting with that letter.

Easy-RTU Installation, Wiring & Conguration Guide
WW03-709
To change an object from Auto“A”to Manual “M” follow the steps below:
- Select the object so it is displayed in the Selected Object area of the terminal window.
- Press the Left arrow key to select the object.
- Press the Left arrow key again to display“STATUS”in place of the object name.
- Press the Left arrow for a third time to select the “STATUS”
- Press the Up/Down arrow keys until“Man” (Manual) is displayed
- Press the Right arrow key to enter set the command.
- Press Enter/Return to go back to the selected object.
To change the value of the selected object:
- Select the object so it is displayed in the Selected Object area of the terminal window.
- Make sure the point is in manual. Not all objects need to be in manual to command. See
Appendix A for which objects need to be in manual.
- Press the Left arrow key to select the object.
- Use the Up/Down arrow keys until the desired value is reached. Or some objects let you enter
the value by typing it in on the keyboard.
- Press the Right arrow key to enter set the value.
ZigBee Mesh Network Settings
These objects are the settings required for communication over the Wireless ZigBee mesh network. Refer
to the Walker Wireless Setup Document (WW01-709) for further information on setting up the ZigBee mesh
network.
DEST_HI The top 32bits of the MAC address. Set to the destination device (usually Zcoord)
DEST_LW The bottom 32 bits of the MAC address. Set to the destination device (usually Zcoord)
SET_PAN The PAN ID of he network to join.
MY__PAN The read PAN ID from the radio.
SAC_ADR The MicroSAC address the data is to be sent to.
ADDRESS The wireless address of the device.
TIMESAC Set to the MicroSAC address that is sending out the time.
ST_ATSC
Set the channels to scan. Each bit of the 2 bytes represents a channel to scan. The radio will
only scan channels selected. If the desired network is on a channel not scanned the radio
will not join.
Channel Bit Channel Bit Channel Bit
B 0 11 6 17 12
C 1 12 7 18 13
D 2 13 8 19 14
E 3 14 9 1A 15
F 4 15 10
10 5 16 11
I.e. to scan all channels set to FFFF. To on scan 1A set to 8000.
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