Gtech GWT154 User manual

PROPRIETARY NOTICE:
This document contains GTECH confidential and proprietary information, know-how, trade secrets,
intellectual property and/or methodologies and is intended only for the use of the individual or entity to
which it is addressed. It may be privileged, and is proprietary, confidential and otherwise exempt from
disclosure under applicable law. This document shall not be modified, reproduced, copied or
transferred without proper prior authorization from GTECH.
Proprietary Notice applies to all pages
APPROVALS DATE
AUTHOR:
Henry Constant
RESPONSIBLE ENGINEER:
Henry Constant
GTECH Aircon Radio (Model GWT154)
User’s Guide
MANUFACTURING ENGINEER:
S. Leigh
QUALITY:
Ray Snow
NO. 96-1886-01E
REV. 1.1
PAGE 1OF 72
REV DESCRIPTION DATE REVIEWED
1.0 Initial Document June 29, 2011
1.1 Updated Transmit Power settings July 5, 2011

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TABLE OF CONTENTS
1.0INTRODUCTION ..........................................................................................................4
1.1Purpose, Overview & Scope......................................................................................................4
1.2Audience....................................................................................................................................4
1.3Applicable Documents...............................................................................................................4
2.0Key Features....................................................................................................................5
3.0GWT154 Wireless Transceiver Application Circuits..................................................6
3.1System Components ..................................................................................................................6
3.2Electronics Overview.................................................................................................................6
3.3Radio Module Pin Definitions...................................................................................................7
3.4Mechanical Drawings................................................................................................................9
3.5Mounting Considerations.........................................................................................................10
3.6Radio Module Performance Characteristics............................................................................13
3.7Host Board Electrical Characteristics......................................................................................15
3.8GWT154 Recommended Configurations................................................................................15
3.9RF Module Operation..............................................................................................................17
3.10Setting Compliance Limits When Using Host Software.........................................................20
4.0Wireless Network Infrastructure................................................................................21
4.1Establishing Network...............................................................................................................21
4.2Device Joining.........................................................................................................................21
4.3Device Security........................................................................................................................22
4.4Non Volatile Settings...............................................................................................................24
5.0Wireless Data Transport..............................................................................................25
5.1End Device selection ...............................................................................................................25
5.2Data Security ...........................................................................................................................26
5.3Acknowledgement...................................................................................................................27
5.4Single Unicast MAC Packet....................................................................................................28
5.5Fragmented Packets.................................................................................................................28
5.6Fragmentation Packet Structure...............................................................................................29
6.0Wireless Inter-communication....................................................................................32
7.0Host and Peripheral Wired Interfaces........................................................................33
7.1Wired Inter-communication.....................................................................................................33

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7.2Wired Interface Infrastructure .................................................................................................37
8.0User Interface................................................................................................................57
8.1Uninstalled Radio ....................................................................................................................57
8.2End Device Joining..................................................................................................................57
8.3Radio Programming.................................................................................................................57
8.4Alternate Configuration and Setup Tool..................................................................................57
9.0Host Port Configuration Sequences............................................................................59
9.1Coordinator Configuration, Network Start and Joining ..........................................................59
9.2Coordinator Configuration Setting Firewall Address Mask....................................................63
9.3Coordinator Configuration – Get End Device Statistics..........................................................64
9.4Coordinator Configuration – Setting End Device Parameters.................................................65
9.5Peripheral Configuration, Status..............................................................................................66
10.0Agency Statements........................................................................................................67
10.1Federal Communication Commission Interference Statement................................................67
10.2Industry Canada Statements ....................................................................................................68
10.3OEM Responsibilities to comply with FCC and Industry Canada Regulations......................70
10.4End Product Labelling.............................................................................................................71
11.0Contacting GTECH Corporation................................................................................72

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1.0 INTRODUCTION
1.1 Purpose,Overview&Scope
The purpose of this document is to provide details regarding the use of the GWT154
transceiver module as a cable replacement between GTECH online lottery terminals and
associated peripherals. The GWT154 transceiver module is based on the IEEE 802.15.4-2006
standard, this wireless link provides a point to multipoint peripheral bus with low latency and
modern security features.
The link operates in the 2.4GHz band with low power, making it suitable for license-free
worldwide operation.
The link will use AES 128 bit authentication and packet encryption available as part of the
802.15.4 standard. It will also use EUI-64 (MAC address) filtering to keep rogue devices off
the network. It relies on the GTECH online lottery terminal for initialization and authorization
of End Device peripherals. This allows GTECH the ability to integrate the local security
measures with field service installations and manufacturing operations, as well as to provide
security audit trails, without on-site technical staff.
This document describes the electrical and wiring considerations when interfacing the
GWT154 module with a GTECH online lottery terminal and a peripheral.
Peripheral devices include (but are not limited to) the following:
Ticket Scan
Accutherm Supreme and Accutherm Ultra printers
Customer Display Units
Jackpot Signs.
1.2 Audience
This document is intended to be read by engineers and technical management. A general knowledge
of common engineering practices is assumed.
1.3 ApplicableDocuments
96-1886-00E, GTECH Wireless Peripheral Transceiver, Rev 3.1, June 2, 2010
96-0258-01, Spec Protocol 485 Bus Packet, Rev D
96-0320-01, RS-485 Physical Interface Specification, Rev C, September 2, 2003
33-0154-01E, System Diagram GWT154, Rev 1, June 3, 2011

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2.0 KEY FEATURES
802.15.4-2006 compliant transceiver operating in the unlicensed Industrial, Scientific, and
Medical (ISM) frequency band of 2.400 – 2.4835 GHz.
Lost Link Prevention – The GWT154 provides a failsafe timeout in the event the GTECH
Terminal doesn’t receive a response from the peripheral.
The GTW 15.4 provides security:
oUses AES 128 bit authentication and packet encryption
oUses EUI-64 (MAC address) filtering to keep rogue devices off the network
oUses the GTECH Terminal for initialization and authorization of End Device
peripherals. This allows GTECH the ability to integrate the local security measures with
field service installations.
oUses a peripheral addressable firewall to exclude single or multiple peripherals from
accessing the GTECH 485 Bus
The GWT154 supports the GTECH 485 Packet Protocol over the following data interfaces:
oGTECH RS-485 (Half duplex 4-wire, DB-9)
Two pairs of uni-directional lines.
The terminal always transmits on Tx± and receives on Rx±.
Female 9-pin DSUB receptacle.
Reset-on-Break support in accordance with [3].
oUSB 2.0 Type B Mini
oInternal 3.3V UART
The following form factors are supported.
oPinned module – For new embedded designs or as an OEM module replacement
1.0” (W) x 1.33” (L) (UART two 1x10 headers)
oDongle – For existing or legacy GTECH online terminals or RS-485 peripherals
2.1” (W) x 2.6” (L) (RS-485 DB9F or USB 2.0 Type mini B interface)
The transceiver will be used only indoors.
RF power will be software selectable at 10mW (10dBm) or 63mW (18dBm) during operation
with a 1dB resolution.
An internal chip antenna is on the circuit board along with a software switchable RF connector
for an optional external antenna connection.
The transceiver derives its power from the following options.
oSpecific interface ports in the dongle configuration.
RS-485: +12V and/or +5V, 300 mA available.
USB: +5V BUS supply
oPCB pins in the OEM replacement module configuration.
oDC power connector – A wall mount power transformer with integral 6 foot cord.
Storage Environment
oTemperature: -40 to +80°C.
oRate of change: 20°C per minute
oHumidity: 10 to 90%, noncondensing.
Operating Environment
oTemperature: -40 to +80°C.
oRate of change: 10°C per minute
oHumidity: 10 to 90%, noncondensing.
Radiated and conducted limits meet FCC part 15 and Industry Canada ICES-003 emission

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standards.
The product complies with all current European Union Directives applicable to CE marking.
RoHS compliant.
3.0 GWT154 WIRELESS TRANSCEIVER APPLICATION CIRCUITS
The Radio Module is a standalone RF module with an optional external dipole antenna. It is intended
to be an RS-485 cable replacement for new GTECH embedded applications or as an OEM replacement
module for our suppliers of GTECH equipment.
For existing or legacy GTECH products, the Radio Module should be mounted to the Host Board via
the two 1x10 headers. These mated boards are enclosed in a plastic housing and this constitutes the
Dongle solution.
3.1 SystemComponents
The GWT154 Wireless Transceiver consists of the following components:
Radio module (51-1884-01E) – Standalone for new designs or as an OEM replacement
module
oRadio Module Label (14-2027-02E)
oOptional External Antenna with Cable
Carrier/Host board (51-1885-01E) – Optional for legacy products
Plastic enclosure (Dongle) – Optional for legacy products
oPlastic Parts (16-2104-502E & 16-2105-502E)
oDongle Label (14-2027-01E)
Wall mount Power Supply – Optional for legacy products
oUS: 50-0347-01E
oUK: 50-0347-02E
oEU: 50-0347-03E
Interface cables – Optional for legacy products
oUSB A to USB mini B Cable (32-1743-01E)
oRS-485 Straight pinned Cable (32-1344-03E)
oRS-485 Crossed pinned Cable (32-1744-01E)
Note: Optional components are used based on the specific installation requirements.
3.2 ElectronicsOverview
The electronic design solution for this product consists of two PC boards.
Radio module. This stand-alone module will be the solution for new embedded designs
or for an OEM module replacement. The two 1 x 10 pin headers will be the interface to
the radio module for all configurations. The radio module will consist of the Texas
Instruments CC2530 SOC, the Texas Instruments CC2591 Front end module, a
Johanson 2450AT18A100 chip antenna, and a Hirose U.FL coaxial RF connector.
A host board will consist of the GTECH RS-485 interface, USB 2.0 interface, DC
power jack, and interface connectors to plug the radio module into. The combination of
these two boards with the plastic enclosure will provide the solution for the dongle.

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Figure 1 – Block Diagram
3.3 RadioModulePinDefinitions
The communication between the Host board and the Radio module is via UART.

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Figure 2 - The interface pin numbering (top side view)
Pin
#
NAMEDESCRIPTION
1VCC3.3Vdc
2UTXUARTdataoutfrommodule
3URXUARTdataintomodule
4NCNoConnect.ModuleoptiontoconnecttoportP1_5
5RESET_NModuleReset
6NCNoconnect.ModuleoptiontoconnecttoportP2_0
7P2_2/DCCC2530DebugClock.Forprogramminganddebuggingofradiomodule
CC2530
8P2_1/DDCC2530DebugData.Forprogramminganddebuggingofradiomodule
CC2530
9DTR_NDataTerminalReadycommunicationline
10GROUNDGround
11NCNoConnect
12CTS_NCleartoSendFlowControl
13SLEEP_NModulestatusindicator
14NC/P1_6/UTX1NoConnect.ModuleoptiontoconnecttoalternativeUARTTXD
15NC/P1_7/URX1NoConnect.ModuleoptiontoconnecttoalternativeUARTRXD
16RTS_NRequesttoSendFlowControl
17TX_ENRS‐485driverenableoutputline.Disablesbusdriverduringhardware
reset
18NCNoConnect.ModuleoptiontoconnecttoportP1_4
19NCNoConnect.ModuleoptiontoconnecttoportP1_2
20STATUS_LEDNoConnect.ModuleoptiontoconnecttoportP1_0
Table 1 - The interface pin assignments and definitions

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3.4 MechanicalDrawings
Figure 3 - Radio Module (1.0” x 1.33”) (antenna option not shown)
Figure 4 - Host Board with Radio Module (1.6” x 2.25”)

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Figure 5 - Plastic Enclosure (2.1" x 2.6")
3.5 MountingConsiderations
The GWT154 Radio Module was designed to mount into a receptacle (socket) and therefore does not
require any soldering when mounting it to a board.
3.5.1 NewGTECHEmbeddedApplicationsorOEMReplacementModules
For new designs, the footprint design on the host/carrier board will depend on the host/carrier board
requirements, desire for compatibility with other GWT154 series modules, and the desired antenna.
(Note: Figure 6 – Example of the GWT154 Radio Module mounting to a Host/Carrier Board does not
show the external antenna option.)

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Figure 6 – Example of the GWT154 Radio Module mounting to a Host/Carrier Board
3.5.2 LegacyGTECHProducts
For existing or legacy GTECH products the Radio Module mounts to the Host Board and is enclosed
in a plastic housing, referred to as the Dongle. This Host board provides RS-485 and USB interface
connectors and an optional DC power connection. It uses two 10-pin receptacles to receive the Radio
Module.
The receptacles used on the Host Board are manufactured by Samtec, CUI Inc. and TYCO. Several
other manufacturers provide comparable mounting solutions; however, GTECH currently uses the
following receptacles:
Surface mount 10 Pin 2mm Single Row Receptacles
oSamtec P/N: SMM-110-02-S-S (or equivalent)
Through hole 2.0mm DC Power Jack
oCUI Inc. P/N: PJ-102A (or equivalent)
Surface-mount 5 Position Right Angle Mini B TYPE USB Jack
oSamtec P/N: MUSBR-05-F-O-B-SM-A
Through-hole 9 Pin Right Angle Female DSUB Connector
oTYCO P/N: 5747844-3

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Figure 7 - Radio Module mounted to the Host Board
Figure 8 - Dongle Assembly (Top and Bottom view)

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3.6 RadioModulePerformanceCharacteristics
ParameterMinTypical MaxUnit
SupplyVoltage(VCC)2.73.33.6Volts
SupplyCurrent250mA
OperatingTemperature‐40 80°C
Temperaturerateof
change
  10°C/min
OperatingHumidity10 90%RH
VoltageonanyIOpin‐0.3VCC+0.3 Volts
Table 2 – Operating Conditions
ParameterMinTypical MaxUnit
RFFrequency24002480MHz
RFChannels16 
RadioBaudRate 250kbps
RadioChipRate 2Mcps
Table 3 - General Radio Characteristics
ParameterMinTypicalMaxUnitConditions
ReceiverSensitivity‐99‐95‐85dBm1%PER,802.15.4‐2006
ReceiverMaximum
Input‐2010dBm1%PER,802.15.4‐2006
ReceiverCurrent2730mA
AdjacentChannel
Rejection(±5MHz)035dBWantedsignal2440MHzat‐82dBm, 802.15.4modulatedinterferer,PER=1%
AlternateChannel
Rejection(±10MHz)3049dBWantedsignal2440MHzat‐82dBm, 802.15.4modulatedinterferer,PER=1%
ChannelRejection(≥
±20MHz)3056dBWantedsignal2440MHzat‐82dBm, 802.15.4modulatedinterferer,PER=1%
Table 4 - RF Receive Specifications (At 25°C – 3.3VDC)

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ParameterMinTypical MaxUnitConditions
TransmitOutputPower 1618dBmTXPOWER=0xD5
MinimumTransmit
OutputPower  10dBmTXPOWER=TBD
TransmitCurrent
(100mW) 165200mATXPOWER=0xF5(20dBm transmitoutputpower)
TransmitCurrent
 85mATXPOWER=TBD
(10mW)
TransmitConducted
Harmonics  ‐20dBcTXPOWER=0xF5(Relative tofundamental)
ErrorVectorMagnitude
(EVM) 1335%TXPOWER=0xF5(20dBm outputpower)
CarrierCenterFrequency‐40 40ppm‐40°Cto+80°C
Table 5 - RF Transmit Specifications (At 25°C – 3.3VDC unless noted)
ParameterLimitConditions
MinimumOperatingBandwidth >500kHz
PeakOutputPower<1W
AntennaGainDeratingLimit<6dBi
SpuriousEmissions(standard)20dBc100kHzmeasurement
bandwidth–upto10thharmonic
SpuriousEmissions(15.205
restrictedbands)
15.209general
emissions
Detectortypeandbandwidth
specifiedPart15.35–upto10th
harmonic
PowerSpectralDensity8dBm/3kHzConductedtoantenna
RadioFrequencyExposure
ClassificationMobiledevice
AntennaRequirement
Fixedantennaor
non‐standard
connector

Table 6 - Primary EMC Certification Requirements FCC Part 15 – Modular Certification

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ParameterConditions
StorageTemperature‐40°Cto+80°C
StorageTemperaturerateof
change20°C/minutemaximum
StorageHumidity10%to90%RH,non‐
condensing
Table 7 - Environmental Requirements
3.7 HostBoardElectricalCharacteristics
ParameterMinTypicalMaxUnit
InputVoltage416Volts
OutputCurrent 800mA
OutputVoltage33.33.6Volts
Table 8 - Power Supply
ParameterMinTypical MaxUnit
SerialBaudRate2.419.2230.4 kbps
InputSupply
Power512Volts
InputSupply
Current300 mA
Table 9 - RS-485 Serial Bus
ParameterMinTypical MaxUnit
SerialBaudRate2.419.2230.4 kbps
InputSupplyPower512Volts
InputSupplyCurrent300  mA
Table 10 - USB Interface – Fully compliant with USB 2.0 specification
3.8 GWT154RecommendedConfigurations
The following drawings identify typical GTECH installation configurations.
1. Installation of an existing RS485 peripheral into a legacy terminal.

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2. Installation of a new RS485 peripheral with the GWT154 embedded radio module (or
modified RS485 peripheral with the GWT154 OEM module replacement).
3. Installation of an existing USB Serial peripheral running GTECH 485 Packet Protocol
into a legacy terminal.
4. Installation of a new USB Serial peripheral running GTECH 485 Packet Protocol with
the GWT154 embedded radio module (or modified peripheral with the GWT154 OEM
module replacement).

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3.9 RFModuleOperation
Network is non-beacon enabled 802.15.4 Medium Access Control (MAC).
Security is CCM* with 128-bit encryption keys.
Random network encryption key assigned during initial commissioning.
Peripheral End Devices are at minimum RFD’s with radio always-on.
Data transfers are Direct mode (Indirect not supported).
PAN ID assigned network Coordinator short address.
With the exception of a smaller maximum fragment size and longer/variable ACK latency, GTECH’s
User Data payloads will pass through the wireless link transparently, with virtually the same
GTECH485 protocol presented at both ends.
The PAN Coordinator radio will be attached the GTECH Terminal Host CPU, which is responsible for
initializing and managing the wireless network. Thus, the Terminal can control the RF channel and
other infrastructure parameters, in addition to commissioning peripherals and controlling security.
Only one radio may be connected to any single Terminal serial port. In a system where a single
Terminal Host CPU is to control multiple Coordinator radios, a dedicated Host serial interface port
must be allocated to each Coordinator radio.
By operating the serial host interface at a higher data rate than the GTECH485’s original 19.2Kb, the
latency introduced by packet buffering within the radio modules can be minimized. The radio module
host serial interface will operate at data rates up to 230K BAUD.
Due to the packet nature of the network, the typical data flow will proceed as follows: The Host CPU
sends a GTECH485 packet to the Coordinator radio via the local wired 485 link. The wired serial
stream is buffered by the Coordinator radio until the entire packet is received. The radio then encrypts
the buffered payload using the network key (randomly generated during wireless network
commissioning). The Coordinator radio then sends the secure packet to the Peripheral connected to the
currently selected End Device radio. The Peripheral’s radio receives the packet, authorizes it, decrypts
its encapsulated payload and sends the entire payload contents to the Peripheral’s Host CPU over the
local 485 wired bus. The End Device radio acts as a local Host CPU proxy to its GTECH485 bus,
sending the packet and receiving one of the ACK responses (ACK, NAK, CAN) from a Peripheral on
the bus. The End Device radio encrypts and sends this ACK back to the Coordinator radio as a secure
packet. The Coordinator receives and decrypts this ACK and, in the role of proxy for the Peripheral,

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transmits the ACK back to the Coordinator’s Host CPU.
Figure 9 - Typical Data Flow
3.9.1 BreakProcessing
Legacy GTECH Peripherals recognize a UART Break condition on the GTECH485 bus as a hardware
reset. The Coordinator radio hardware does not include dedicated UART Break detect hardware, but
the Coordinator radio firmware will monitor the GTECH485 bus for a UART Break condition. In
addition, the Host CPU may issue a Break command packet to the Coordinator. In either event, the
Coordinator will broadcast a Break command packet to all the currently Associated End Devices in its
PAN. The End Device radios will software self-reset which, by virtue of the radio’s power-on
initialization sequence, will assert a Break on its wired 485 bus.

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Coordination
Host CPU Coordination Radio
Assert Break or
Send Break Command
Encrypt
Peripheral
End Device
Radio
Decrypt
485 Bus
Hardware Break
RS-485 RS-485
802.15.4
MAC
Broadcast MAC packet
Software
Power-On-Reset
Associate Request
Associate Response
Figure 10 - Break Emulation Sequence
3.9.2 NetworkStartup
The Coordinator will not automatically create the network; it is commanded by the Host CPU to do so.
The Host CPU configures the radio with the required network parameters such as Channel and PAN
before initiating network startup.
3.9.3 EndDeviceAssociation
Devices previously joined to a PAN automatically attempt to associate with their joined network as
soon as they are powered up. The TIMAC will issue an 802.15.4 Beacon Request on every channel
enabled and wait to see if it receives a response from its PAN Coordinator. If an association attempts
fail on all channels, there is a random 10-15 second wait time before the next attempt is made.
3.9.4 802.15.4MACAcknowledgeTransaction
At a low level, each unicast 802.15.4 data transmission is actually a transaction with
acknowledgement. This low-level acknowledgement and retry mechanism serves to increase the
reliability of the wireless link enormously. This functionality is hidden from the application layer and
the user.
The GTECH485 protocol ACK is actually a separate transaction. At the low level it looks exactly the
same as any other data transaction.
3.9.5 TransmitPowerLevel
The TIMAC Application Programming Interface allow setting of the radio’s with a 1dB resolution

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between -25dBm and +19dBm. This range is only available on radio modules with the TI CC2591
Power-Amplifier/LNA IC, -25dBm to +11dBm with the CC2590 PA/LAN and the CC2530 by itself is
-25dBm to 0dBm.
3.10 SettingComplianceLimitsWhenUsingHostSoftware
The GTECH485 Test Tool Programming Interface allow setting of the radio’s transmit output power
level with a 1dB resolution between -25dBm and +19dBm. This range is only available on radio
modules with the Power-Amplifier/LNA IC and by itself is limited to -25dBm to 0dBm. Refer to
Error! Reference source not found. for a list of settable transmit output power levels.
Refer to Table 11 - Compliance Limits for setting up the proper compliance limits.
RF
Channel
Max Host RF Power Value
(dBm) TX_PWR Register Value RF Output Power (mW)
US EU US EU US EU
11 18 11 0xC5 0x75 63.1 12.6
12 18 11 0xC5 0x75 63.1 12.6
13 18 11 0xC5 0x75 63.1 12.6
14 18 11 0xC5 0x75 63.1 12.6
15 18 11 0xC5 0x75 63.1 12.6
16 18 11 0xC5 0x75 63.1 12.6
17 18 11 0xC5 0x75 63.1 12.6
18 18 11 0xC5 0x75 63.1 12.6
19 18 11 0xC5 0x75 63.1 12.6
20 18 11 0xC5 0x75 63.1 12.6
21 18 11 0xC5 0x75 63.1 12.6
22 18 11 0xC5 0x75 63.1 12.6
23 18 11 0xC5 0x75 63.1 12.6
24 18 11 0xC5 0x75 63.1 12.6
25 18 11 0xC5 0x75 63.1 12.6
26 13 13 0x85 0x85 20.0 20.0
Note: When using Optional External Dipole Antenna, RF Channel 26 reduces for FCC Compliance:
26 9 13 0x65 0x85 7.9 20.0
Table 11 - Compliance Limits