Murata WSN802G Quick setup guide

Revision History
Revision
Date
Author
Change Description
1
06/18/2012
F. Perkins
Initial issue
2
01/27/2015
R. Willett
Reformatted to comply with new Murata V.I.
RFM products are now
Murata products.
WSN802G
802.11g
Wireless Sensor
Network Module
Integration Guide
©2009-2015 by Murata Electronics N.A., Inc.
WSN802G Rev. 2.0 01-27-15 www.murata.com

Important Regulatory Information
RFM Product FCC ID: HSW-WSN802G
IC 4492A-WSN802G
Note: This unit has been tested and found to comply with the limits for a Class B digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the in-
struction manual, may cause harmful interference to radio communications. Operation of this equipment
in a residential area is likely to cause harmful interference in which case the user will be required to cor-
rect the interference at their expense.
The WSN802G has been designed to operate with any dipole antenna of up to 9 dBi of gain, or any patch
antenna of up to 12 dBi gain.
See Section 3.10 of this manual for regulatory notices and labeling requirements. Changes or modifica-
tions to a WSN802G not expressly approved by RFM may void the user’s authority to operate the
module.
Important Export Information
ECCN: 5A002.a.1 ENC
CCATS: G073573
The WSN802G products are classified under ECCN codes as 5A002.a.1 class devices and carry and
ENC encryption exception. RFM has had the WSN802G products pre-screened which allows exports to
countries listed in Supplement 3 to Part 740 of the Export Administration Requirements License Excep-
tion ENC Favorable Treatment Countries. When exporting products containing any of the WSN802G
products to this list of countries, CCATS G073573 should be referenced.
Export of the WSN802G products or products containing any of the WSN802G products to other coun-
tries will require additional review and may be prohibited.
This information is provided as a guide to exporting WSN802G-based products but it is the responsibility
of the entity exporting WSN802G products or devices to determine their actual requirements.
©2009-2015 by Murata Electronics N.A., Inc.
WSN802G Rev. 2.0 01-27-15 www.murata.com

Table of Contents
1.0 WSN802G Introduction .......................................................................................................................5
1.1 Features........................................................................................................................................... 6
1.2 Applications......................................................................................................................................6
2.0 WSN802G Operation .........................................................................................................................7
2.1 Active and Sleep Modes ..................................................................................................................7
2.2 Automatic I/O Reporting...................................................................................................................8
2.3 Data Serial Port................................................................................................................................8
2.4 Diagnostic Serial Port.......................................................................................................................8
2.5 Serial Peripheral Interface (SPI) Port...............................................................................................8
2.6 Analog I/O ........................................................................................................................................ 9
2.7 Digital I/O .......................................................................................................................................10
3.0 WSN802G Hardware.........................................................................................................................11
3.1 Absolute Maximum Ratings ...........................................................................................................11
3.2 Specifications.................................................................................................................................12
3.3 Module Interface ............................................................................................................................13
3.4 WSN802GC and WSN802GP Antenna Connector .......................................................................14
3.5 Input Voltage..................................................................................................................................15
3.6 ESD and Transient Protection .......................................................................................................15
3.7 Interfacing to 5 V Logic Systems ...................................................................................................15
3.8 Power-On Reset Requirements.....................................................................................................15
3.9 Mounting and Enclosures..................................................................................................................16
3.10 Labeling and Notices......................................................................................................................17
4.0 Application Protocol...........................................................................................................................19
4.1 I/O Read Request ..........................................................................................................................19
4.2 I/O Read - I/O Report.....................................................................................................................20
4.3 I/O Write GPIO...............................................................................................................................20
4.4 I/O Write PWM...............................................................................................................................20
4.5 I/O Write Reply...............................................................................................................................21
4.6 I/O Serial Read...............................................................................................................................21
4.7 I/O Serial Write...............................................................................................................................22
4.8 I/O SPI Read..................................................................................................................................22
4.9 I/O SPI Write..................................................................................................................................23
4.10 CFG Read......................................................................................................................................23
4.11 CFG Read Reply............................................................................................................................23
4.12 CFG Write......................................................................................................................................22
4.13 CFG Write Reply............................................................................................................................24
4.14 Configuration Parameters..............................................................................................................24
5.0 IP Address Discovery Protocol..........................................................................................................38
5.1 IP Hunt Query ................................................................................................................................39
5.2 IP Hunt Reply.................................................................................................................................39
6.0 SSID, Channel, Encryption and Authentication.................................................................................40
6.1 Connection Scanning.....................................................................................................................40
6.2 Ad Hoc Mode .................................................................................................................................40
7.0 SNMP Module Configuration.............................................................................................................41
7.1 SNMP Traps...................................................................................................................................41
7.2 SNMP Parameter OIDs.....................................................................................................................42
©2009-2015 by Murata Electronics N.A., Inc.
WSN802G Rev. 2.0 01-27-15 www.murata.com

8.0 WSN802GDK/WSN802GADK and WSN802GDK-A/WSN802GADK-A Developer’s Kits................67
8.1 Kit Contents....................................................................................................................................67
8.2 Additional Items Needed................................................................................................................67
8.3 Developer Kit Assembly and Testing.............................................................................................68
8.4 Host Configurations to Support Module Discovery .......................................................................70
8.5 Developer Board Features.............................................................................................................73
8.6 WSNConfig Program Operation.....................................................................................................75
9.0 Troubleshooting.................................................................................................................................92
10.0 Appendices........................................................................................................................................93
10.1 Ordering Information......................................................................................................................93
10.2 Technical Support..........................................................................................................................93
10.3 WSN802G Mechanical Specifications ...........................................................................................94
10.4 WSN802G Developer Board Schematic........................................................................................98
11.0 Warranty..........................................................................................................................................101
©2009-2015 by Murata Electronics N.A., Inc.
WSN802G Rev. 2.0 01-27-15 www.murata.com

1. WSN802G Introduction
The WSN802G transceiver module is a low cost, robust solution for 802.11b/g/n sensor networks. The
WSN802G is unique in that it is able to sleep while still remaining a member of an 802.11b/g/n network.
The WSN802G’s low active current and very low sleep current makes long life battery operation practical.
The WSN802G module includes analog, digital and serial I/O, providing the flexibility and versatility need-
ed to serve a wide range of sensor network applications. The WSN802G module is easy to integrate and
is compatible with standard 802.11b/g/n routers.
Figure 1.0.1
An example 802.11b/g/n network with WSN802G sensor nodes is shown in Figure 1.0.1. A sensor net-
work application running on a server or PC communicates with one or more WSN802G sensor nodes
through a commercial 802.11b/g/n router. WSN802G sensor nodes can be used with 802.11b/g/n routers
that are also serving other applications.
Figure 1.0.2
A WSN802G module is integrated with other components to create a complete sensor node. These com-
ponents include a host circuit board, a power supply (battery), sensor I/O electronics and/or a host micro-
controller, and a housing (external antenna also required on some WSN802G models). Two common
configurations are show in Figure 1.0.2. Serial sensor data communication between a WSN802G module
and its host microcontroller requires no protocol formatting. The WSN802G formats data received from its
host into UDP packets for RF transmission, and delivers the payload data from received UDP packets to
©2009-2015 by Murata Electronics N.A., Inc.
HN-210D/X, HN-214 D/X Rev. 2.0 01-16-15 Page 5 of 101 www.murata.com

its host. The sensor network application on the server or PC uses a simple protocol to send and receive
data from WSN802G sensor nodes, as detailed in Section 4. WSN802G modules can receive configura-
tion commands through either their serial port or over-the-air in UDP packets carrying SNMP commands.
1.1. Features
WSN802G modules provide a unique set of features for wireless sensor network applications:
•Compatibility with commercial and industrial 802.11b/g/n routers
•Low power consumption for long life battery operation including sleep mode
•Full -40 to +85 ºC industrial temperature range operation
•Analog and digital I/O, plus two serial and one SPI port
•Separate data and diagnostic ports
•System/application set up using just two Management Information Blocks (MIBs)
•Full 14 channel 802.11b/g coverage for world wide operation
•FCC, Canadian IC and European ETSI certifications
•Four module configurations:
WSN802GC - solder reflow mounting with RF connector for external antenna connection
WSN802GCA - solder reflow mounting with integral chip antenna
WSN802GP - plug in connector mounting with RF connector for external antenna connection
WSN802GPA - plug in connector mounting with integral chip antenna
•Automatic or manual I/O data reporting
1.2 Applications
WSN802G sensor networks are well suited to applications where IEEE 802.11b/g/n router compatibility,
industrial temperature range operation and long battery life are important. Many applications match these
criteria, including:
•Energy Monitoring and Management
•Physical Asset Management
•Cold Chain Data Logging and Food Safety
•Security and Access Control Systems
•Environmental Monitoring
•Many More
©2009-2015 by Murata Electronics N.A., Inc.
HN-210D/X, HN-214 D/X Rev. 2.0 01-16-15 Page 6 of 101 www.murata.com

2.0 WSN802G Operation
WSN802G operation is designed to support long battery life by allowing the module to stay in sleep mode
to the maximum extent possible. Compared to 802.11b/g cards used in notebook and handheld comput-
ers, the WSN802G’s active current is also very low.
2.1 Active and Sleep Modes
Once the SNMP Server IP address has been set, the default state of the WSN802G is sleep mode. The
WSN802G has a dedicated input to switch it from sleep to active mode, WAKE_IN (Pin 26). There are five
events that will wake the WSN802G from sleep mode:
•Applying a logic high signal on the WAKE_IN pin
•Expiration of the AutoReport timer
•Expiration of Linkup trap timer
•Expiration of the Config trap timer
•Module’s Primary SNMP Server IP address has not been set (this will not wake it, it prevents it
from sleeping)
The WAKE_IN pin and AutoReport can be enabled/disabled. The Linkup timer sends a keep alive packet
to the router every 60 seconds by default. The Config timer cannot be disabled and will generate a Config
trap every 10 seconds by default. Once a module has been initially configured, the Config timer is typical-
ly set to a longer interval.
When the module wakes to an active state due to either the WAKE_IN pin or the AutoReport timer, it re-
mains awake for a time period controlled by the WakeTimeout timer. The module returns to sleep mode
when the WakeTimeout timer expires, subject to the conditions listed below. The WakeTimeout timer is
held in reset and the module remains in active mode when any of the following events occur:
•A logic high signal is held on the WAKE_IN pin
•A serial byte is received
•An RF packet is sent or received
•Module’s SNMP Server IP address has not been set
The WakeTimeout feature is used to support scenarios such as a server application parsing the I/O report
and sending back a serial string or I/O output change command, or a host processor sending a serial
string and waiting for a response.
As discussed in Section 5, the SNMP Server IP address can be set in a short period of time, allowing the
module to switch to sleep mode for battery conservation. The SNMP server IP address only needs to be
set one time.
A WSN802G module that has an SNMP Server IP Address but is not linked to an 802.11b/g/n router will
cycle between sleep and active mode under the control of the scanning algorithm, even if none of the
wake events discussed above are present.
©2009-2015 by Murata Electronics N.A., Inc.
HN-210D/X, HN-214 D/X Rev. 2.0 01-16-15 Page 7 of 101 www.murata.com

Whenever the module is in active mode, a logic high is asserted on WAKE_OUT (Pin 27). WAKE_OUT
can be used to signal an external processor. When the WSN802G is in sleep mode, WAKE_OUT is set
to logic low.
2.2 Automatic I/O Reporting
The WSN802G sends an I/O report when one of the following events occur:
•A logic high signal is applied to the WAKE_IN pin
•The AutoReport timer fires (module in either active or sleep mode)
2.3 Data Serial Port
The data serial port on the WSN802G modules supports baud rates from 1.2 to 921.6 kbps. The following
serial port configurations are supported:
•5, 6, 7 and 8-bit character lengths
•1 or 2 stop bits
•Even, odd, mark, space or no parity
The default serial port configuration is 9.6 kbps, 8, N,1. See Sections 4.14 and 7.2 for serial port configu-
ration details. Serial port operation is full-duplex. Data is sent and received on the serial port transparent-
ly, with configuration information sent and received as UDP datagrams. The WSN802G includes an
acknowledgement and retry mechanism to minimize data loss on RF transmissions. However, the UDP/IP
protocol being carried by the RF transmissions does not provide guaranteed end-to-end delivery. The
user must make provisions for detecting and resending data lost on an end-to-end transmission. The
WSN802G data port is supported with optional /HOST_RTS and /HOST_CTS flow control signals.
2.4 Diagnostic Serial Port
The diagnostic serial port on the WSN802G modules supports baud rates from 1.2 to 115.2 kbps. The
default diagnostic port configuration is 9.6 kbps, 8, N,1. Diagnostic port operation is full-duplex, three-
wire, without flow control support. Diagnostic data is sent and received using a simple string protocol.
Contact RFM module technical support for diagnostic port data format information.
2.5 Serial Peripheral Interface (SPI) Port
The WSN802G SPI port provides master mode functionality at data rates configurable up to 11 Mbps. SPI
port operation is full duplex in the sense that a single clock signal simultaneously shifts data into and out
of the SPI port.
©2009-2015 by Murata Electronics N.A., Inc.
HN-210D/X, HN-214 D/X Rev. 2.0 01-16-15 Page 8 of 101 www.murata.com

Figure 2.5.1
Figure 2.5.1 shows the signals a WSN802G uses in SPI Master mode. The AutoReport function triggers
the WSN802G module to clock out a configurable command string, SPI_MasterCmdStr, to collect data
from a Slave peripheral. The collected data is then transmitted as a data message. Alternatively, a host
connected to the base can transmit an SPI command as a data message to the remote. The WSN802G
will clock the command into its Slave peripheral and transmit back the Slave’s response, as show in Fig-
ure 2.5.2. In either case, data strings are limited to 256 bytes.
Figure 2.5.2
2.6 Analog I/O
The WSN802G includes two 10-bit ADC inputs, ADC0 (Pin 18) and ADC1 (Pin 19). Pin 25 provides a full-
scale reference voltage to support ratiometric ADC measurements. ADC measurements are triggered and
added to the automatic I/O report when a logic high signal is first applied to the WAKE_ IN pin or the Au-
toReport timer fires, as discussed in Section 2.2. An ADC reading is also made on the internal buss volt-
age of the WSN802G and included in the automatic I/O report. These readings can also be retrieved any-
time the WSN802G is in active mode using the IO_REPORT application protocol command as discussed
in Section 4.1.
The WSN802G also includes a 16-bit pulse width modulated output, PWM0 (Pin 9). The PWM output is
low-pass filtered to provide an analog output voltage with ripple suppressed to 7 bits. External low-pass
filtering can be added to further suppress ripple. The full-scale PWM output is referenced to the regulated
©2009-2015 by Murata Electronics N.A., Inc.
HN-210D/X, HN-214 D/X Rev. 2.0 01-16-15 Page 9 of 101 www.murata.com

supply voltage (Pin 24). The PWM output is set using the IO_ WRITE_PWM application protocol com-
mand, as discussed in Section 4.4.
2.7 Digital I/O
The WSN802G includes four general purpose input/output (GPIO) ports, GPIO0 (Pin 4), GPIO1 (Pin 11),
GPIO2 (Pin 10) and GPIO3 (Pin 12). When programmed as inputs, GPIO pins include an internal weak
pull-up. The states of pins configured as inputs are captured as part of the automatic I/O report when a
logic high signal is applied to the WAKE_IN pin or the AutoReport timer fires, as discussed in Section 2.2.
These readings can also be retrieved anytime the WSN802G is in active mode using the
IO_READ_REQUEST application protocol command as discussed in Section 4.1. The states of GPIO
pins configured as outputs are set using the IO_WRITE_GPIO application protocol command as dis-
cussed in Section 4.3.
©2009-2015 by Murata Electronics N.A., Inc.
HN-210D/X, HN-214 D/X Rev. 2.0 01-16-15 Page 10 of 101 www.murata.com

3.0 WSN802G Hardware
Figure 3.0.1
WSN802G modules operate in the international 2.4 GHz ISM band over the frequency range of 2401-
2474 MHz, with a nominal RF output power of 10 mW. WSN802G modules support four standard
802.11g RF data rates, 1, 2, 5.5 and 11 Mbps. WSN802G modules provide a variety of hardware inter-
faces. There are two serial interfaces, one for data and a second for diagnostics. The data port supports
standard serial baud rates from 1.2 to 921.6 kbps, and the diagnostic port supports standard serial baud
rates from 1.2 to 115.2 kbps. Optional hardware flow control is provided for the data serial port. There is
also a serial peripheral interface (SPI), which can operate in either master or slave mode. SPI slave mode
supports data rates up to 2 Mbps, and master mode supports data rates up to 11 Mbps.
WSN802G modules includes two 10-bit ADC inputs, a 16-bit PWM (DAC) output, and four general pur-
pose input/output (GPIO) ports. WSN802G modules are available with either RF connectors for external
antennas, or with integral chip antennas (A suffix). WSN802G modules are available in two mounting con-
figurations. The WSN802GC and WSN802GCA are designed for solder reflow mounting, and the
WSN802GP and WSN802GPA are designed for plug-in connector mounting.
3.1 Absolute Maximum Ratings
Rating
Sym
Value
Units
Input/Output Pins Except ADC Inputs
-0.5 to +3.63
V
ADC Input Pins
-0.5 to 1.98
V
Non-Operating Ambient Temperature Range
-40 to +85
o
C
Table 3.1.1
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3.2 Specifications
Characteristic
Sym
Minimum
Typical
Maximum
Units
Operating Frequency Range
2401
2474
MHz
Spread Spectrum Method
Direct Sequence
RF Chip Rate
11
Mcps
RF Data Rates
1, 2, 5.5, 11
Mbps
Modulation Type BPSK at 1 Mbps, QPSK at 2 Mbps
CCK at 5.5 and 11 Mbps
Number of RF Channels
11
RF Channel Spacing
5
MHz
Receiver Sensitivity, 8% PER:
1 Mbps RF Data Rate
-92
dBm
2 Mbps RF Data Rate
-90
dBm
5.5 Mbps RF Data Rate
-84
11 Mbps RF Data Rate
-81
RF Transmit Power
10
mW
WSN802GC and WSN802GP RF Connector
U.FL Coaxial Connector
Optimum External Antenna Impedance
50
Ω
WSN802GCA and WSN802GPA Antenna
Integral Chip
ADC Input Range
0
1.8
V
ADC Input Resolution
10
bits
ADC Input Impedance
1
MΩ
PWM Output Resolution
16
bits
Data Serial Port Baud Rates 1.2, 2.4, 4.8, 9.6 (default), 19.2, 28.8, 38.4,
57.6, 76.8, 115.2, 230.4, 460.8, 921.6
kbps
Diagnostic Serial Port Baud Rate 1.2, 2.4, 4.8, 9.6 (default), 19.2, 28.8, 38.4,
57.6, 76.8, 115.2
kbps
Serial Peripheral Interface (SPI) Data Rate, Master Mode
11
Mbps
Serial Peripheral Interface (SPI) Data Rate, Slave Mode
2
Mbps
Digital I/O:
Logic Low Input Level
-0.3
0.7
V
Logic High Input Level
2.24
VCC
V
Input Pull-up Resistor
50
1000
KΩ
Logic Low Output Level
0
0.4
V
Logic High Output Level
2.4
VCC
V
Power Supply Voltage Range
VCC
+3
+3.63
Vdc
Power Supply Voltage Ripple
10
mVP-P
Receive Mode Current
150
mA
Transmit Mode Current
200
mA
Sleep Mode Current
7.5
µA
WSN802GC and WSN802GCA Mounting
Reflow Soldering
WSN802GP and WSN802GPA Mounting
Socket
Operating Temperature Range
-40
85
o
C
Operating Relative Humidity Range, Non-condensing
10
90
%
Table 3.2.1
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3.3 Module Interface
Pin
Name
I/O
Description
1
GND
-
Power supply and signal ground. Connect to the host circuit board ground.
2
DIAG_TX
O
Diagnostic serial port output.
3
DIAG_RX
I
Diagnostic serial port input.
4
GPIO0
I/O
Configurable digital I/O port 0. An internal weak pull-up is provided when configured as an input.
5
RADIO_TXD
O
Serial data output from the radio.
6
RADIO_RXD
I
Serial data input to the radio.
7 /HOST_CTS O UART/SPI flow control output. The module sets this line low when it is ready to accept data from the
host on the RADIO_RXD or MOSI input. When the line goes high, the host must stop sending data.
8 /HOST_RTS I UART flow control input. The host sets this line low to allow data to flow from the module on the
RADIO_TXD pin. When the host sets this line high, the module will stop sending data to the host.
9 PWM0 O 16-bit pulse-width modulated output with internal low-pass filter. Filter is first-order, with a 159 Hz 3
dB
bandwidth, 10K output resistance.
10
GPIO2
I/O
Configurable digital I/O port 2. An internal weak pull-up is provided when configured as an input.
11
GPIO1
I/O
Configurable digital I/O port 1. An internal weak pull-up is provided when configured as an input.
12
GPIO3
I/O
Configurable digital I/O port 3. An internal weak pull-up is provided when configured as an input.
13
RSVD
-
Reserved pin. Leave unconnected.
14
VCC
I
Power supply input, +3.0 to +3.63 Vdc.
15
GND
-
Power supply and signal ground. Connect to the host circuit board ground.
16
GND
-
Power supply and signal ground. Connect to the host circuit board ground.
17
/RESET
I
Active low module hardware reset.
18
ADC0
I
10-bit ADC input 0. ADC full scale reading can be referenced to the module’s +1.8 V regulated supply.
19
ADC1
I
10-bit ADC input 1. ADC full scale reading can be referenced to the module’s +1.8 V regulated supply.
20
SPI_IN
I/O
This pin is the SPI master mode input.
21
SPI_OUT
I/O
This pin is the SPI master mode output.
22 /SS I/O SPI active low slave select. This pin is an output when the module is operating as a master, and an
input when it is operating as a slave.
23 SCLK I/O SPI clock signal. This pin is an output when operating as a master, and an input when operating as
a slave.
24 3.3V_OUT O Module’s +3.3 V regulated supply, available to power external sensor circuits. Current drain on this
output should be no greater than 50 mA.
25 ADC_REF O Module’s +1.8 V regulated supply, used for ratiometric ADC readings. Current drain on this output
should be no greater than 10 mA.
26 WAKE_IN I Active high interrupt input to wake the module from timer sleep. Can be used to wake module on
event, etc.
27 WAKE_OUT O Active high output asserted when module wakes from timer sleep. Can be used to wake an
external device.
28
GND
-
Connect to the host circuit board ground plane.
29
RSVD
-
Reserved pin. Leave unconnected.
30
GND
-
Connect to the host circuit board ground plane.
Table 3.3.1
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3.4 WSN802GC and WSN802GP Antenna Connector
A U.FL miniature coaxial connector is provided on the WSN802GC and WSN802GP modules for connec-
tion to the RFIO port. A short U.FL coaxial cable can be used to connect the RFIO port directly to an an-
tenna. In this case the antenna should be mounted firmly to avoid stressing the U.FL coaxial cable due
to antenna mounting flexure. Alternately, a U.FL coaxial jumper cable can be used to connect the
WSN802G module to a U.FL connector on the host circuit board. The connection between the host circuit
board U.FL connector and the antenna or antenna connector on the host circuit board should be imple-
mented as a 50 ohm stripline. Referring to Figure 3.4.1, the width of this stripline depends on the thick-
ness of the circuit board between the stripline and the groundplane. For FR-4 type circuit board materials
(dielectric constant of 4.7), the width of the stripline is equal to 1.75 times the thickness of the circuit
board. Note that other circuit board traces should be spaced away from the stripline to prevent signal
coupling, as shown in Table 3.4.1. The stripline trace should be kept short to minimize its insertion loss.
Figure 3.4.1
Trace Separation from
50 ohm Microstrip
Length of Trace Run
Parallel to Microstrip
100 mil
125 mill
150 mil
200 mil
200 mil
290 mil
250 mil
450 mil
300 mil
650 mil
Table 3.4.1
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3.5 Input Voltage
WSN802G radio modules can operated from an unregulated DC input (Pin 14) in the range of 3.0 V
(trough) to 3.63 V (peak) over the temperature range of -40 to 85°C. Applying AC, reverse DC, or a DC
voltage outside the range given above can cause damage and/or create a fire and safety hazard. Further,
care must be taken so logic inputs applied to the radio stay within the voltage range of 0 to 3.3 V. Signals
applied to the analog inputs must be in the range of 0 to ADC_REF (Pin 25). Applying a voltage to a logic
or analog input outside of its operating range can damage the WSN802G module.
3.6 ESD and Transient Protection
WSN802G circuit boards are electrostatic discharge (ESD) sensitive. ESD precautions must be observed
when handling and installing these components. Installations must be protected from electrical transients
on the power supply and I/O lines. This is especially important in outdoor installations, and/or where con-
nections are made to sensors with long leads. Inadequate transient protection can result in damage
and/or create a fire and safety hazard.
3.7 Interfacing to 5 V Logic System
All logic signals including the serial ports on the WSN802G are 3.3 V signals. To interface to 5 V signals,
the resistor divider network shown in Figure 3.7.1 below must be placed between the 5 V signal outputs
and the WSN802G signal inputs. The output voltage swing of the WSN802G 3.3 V signals is sufficient to
drive 5 V logic inputs.
Figure 3.7.1
3.8 Power-On Reset Requirements
When applying power to the WSN802G, the /RESET pin should be held low until the power supply volt-
age reaches 3.3 volts for 100 milliseconds.
3.9 Mounting and Enclosures
WSN802GC radio modules are mounted by reflow soldering them to a host circuit board. WSN802GP
modules are mounted by plugging their pins into a set of mating connectors on the host circuit board.
Refer to Section 10.3 and/or the WSN802G Data Sheet for mounting details.
WSN802G enclosures must be made of plastics or other materials with low RF attenuation to avoid com-
promising antenna performance where antennas are internal to the enclosure. Metal enclosures are not
suitable for use with internal antennas as they will block antenna radiation and reception. Outdoor enclo-
sures must be water tight, such as a NEMA 4X enclosure.
WSN802G
©2009-2015 by Murata Electronics N.A., Inc.
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3.10 Labeling and Notices
WSN802G FCC Certification - The WSN802G hardware has been certified for operation under FCC Part
15 Rules, Section 15.247. The antenna(s) used for this transmitter must be installed to provide a separa-
tion distance of at least 20 cm from all persons and must not be co-located or operating in conjunction
with any other antenna or transmitter.
WSN802G FCC Notices and Labels - This device complies with Part 15 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.
A clearly visible label is required on the outside of the user’s (OEM) enclosure stating ”Contains FCC ID:
HSW-WSN802G.”
WARNING: This device operates under Part 15 of the FCC rules. Any modification to this device, not
expressly authorized by RFM, Inc., may void the user’s authority to operate this device. Canadian De-
partment of Communications Industry Notice - IC: 4492A-WSN802G
This apparatus complies with Health Canada’s Safety Code 6 / IC RSS 210.
ICES-003
This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus
as set out in the radio interference regulations of Industry Canada.
Le present appareil numerique n’emet pas de bruits radioelectriques depassant les limites applicables
aux appareils numeriques de Classe B prescrites dans le reglement sur le brouillage radioelectrique
edicte par Industrie Canada.
ETSI EN 300 328
The WSN802G module has passed ETSI EN 300 328 testing conducted by an independent test
laboratory.
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4.0 Application Protocol
In most applications, the WSN802G auto-reporting function will be used to routinely send data from a
module to the application. The WSN802G supports this type of operation through use of the auto-
reporting function and the AutoReport and WakeTimeout timers.
There are three ways to read and write data and configuration parameters to and from the WSN802G
module: (1) over the air using SNMP traps - configuration only; (2) over the air using UDP to send the
WSN protocol; and (3) through the module’s UART or SPI port using the WSN protocol. The SNMP pro-
tocol is distinct from the UDP and serial port protocol. The UDP and serial port protocol only differs in the
UPD/IP packet header data.
Modules will request SNMP configuration changes using Config Traps. The frequency of checking for
changes is configured through the Config trap timer. Details of the SNMP commands and operation is
provided in Section 7 of this manual.
Modules must be in active mode (awake) to receive API commands through either over the air UDP
commands or through the module’s UART or SPI port. In addition to sending data, auto-report transmis-
sions signal the application that the module is awake. Setting the WakeTimeout timer to 2 seconds will
keep the module awake, giving the application 2 seconds to send API commands to the module. The
module will remain awake past the 2 seconds if commands are being received or processed. Once the
commands are completed the module will return to sleep immediately if the WakeTimeout time has
elapsed.
The format of all of the WSN API commands and responses are given in Sections 4.1 through 4.13 be-
low. API commands and responses sent through a wireless server (access point, etc.) are formatted as
UDP/IP packets. The IPv4 UDP/IP packet format is shown in Figure 4.0.1 below. API commands and re-
sponses are carried in the UDP datagram payload area. In the text below, API commands and responses
will be referred to as datagrams with the understanding they are the payload of a UDP datagram when
sent through a wireless server. Automatically generated I/O reports from the WSN802G module due to
timeouts or event interrupts take the form of the IO_READ - IO_REPORT datagram shown in Section 4.2.
The IO_READ – IO_REPORT message is only available over the air and not through the module’s serial
ports.
Byte 0
Byte 1
Byte 2
Byte 3
IP
Version
Header
Length
Type of
Service
Total
Length
ID
Flags
Fragment Offset
Time to Live
Protocol
Header Checksum
Source IP Address
Destination IP Address
Source Port
Destination Port
UDP Length
Checksum
Payload (Application Command)
Figure 4.0.1
WSN802G modules only accept wireless application commands from and send wireless application
command data/replies to the IP address of the server running their sensor application which is configured
in the SensorServerIP parameter.
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As shown in Figure 4.0.2 below, WSN802G application protocol datagrams use a standard header begin-
ning with a protocol identifier to discriminate WSN802G protocol messages from other message types.
Datagrams are in 32-bit, big-endian format. The standard header fields are:
Protocol Identifier: Unique identifier for all WSN messages, 0x52464D49
Opcode: Code indicating the type of command or response
Transaction ID: This is an incrementing transaction reference counter. Each end of the
link must keep its own counter for transactions that it originates. The
most significant bit of the transaction ID will be set for all transactions
that the server originates.
The WSN802G application protocol messages are listed in Table 4.0.1 below. The port number that the
module sends and receives wireless UDP application messages on is defined by the SensorServer-
PortNum parameter, as discussed in Section 7.2. A WSN802G module will accept wireless UDP messag-
es specifically addressed to it, or that are broadcast (addressed to all modules). If a command is received
through a wireless broadcast, the WSN802G module will reply with a broadcast.
The message format is the same for both the over the air UDP payload and the serial data communicated
over either the module’s UART or SPI ports. The Protocol Identifier serves as the start character for
UART or SPI communicated packets with the Opcode used as a further validation of a API message in-
stead of application data.
Byte 0
Byte 1
Byte 2
Byte 3
WSN802G Protocol Identifier = 0x52464D49
Opcode
Transaction ID
Data (variable length)
Figure 4.0.2
Opcode
Direction
Description
0x0000
Server-to-Module
IO_READ_REQUEST
0x0001
Module-to-Server
IO_READ - IO_REPORT
0x0002
Server-to-Module
IO_WRITE_GPIO
0x0003
Server-to-Module
IO_WRITE_PWM
0x0004
Module-to-Server
IO_WRITE_REPLY
0x0005
Module-to-Server
IO_SERIAL_READ
0x0006
Server-to-Module
IO_SERIAL_WRITE
0x0007
Module-to-Server
IO_SPI_READ
0x0008
Server-to-Module
IO_SPI_WRITE
0x0010
Server-to-Module
CFG_READ
0x0011
Module-to-Server
CFG_READ_REPLY
0x0012
Server-to-Module
CFG_WRITE
0x0013
Module-to-Server
CFG_WRITE_REPLY
Table 4.0.1
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4.1 I/O Read Request
The IO_READ_REQUEST datagram is used to request current I/O values, as shown in Figure 4.1.1.
Byte 0
Byte 1
Byte 2
Byte 3
WSN802G Protocol Identifier = 0x52464D49
Opcode = 0x0000
Transaction ID = varies
Figure 4.1.1
The module responds to an IO_READ_REQUEST with an IO_READ - IO_REPORT
4.2 I/O Read - I/O Report
The IO_READ - IO_REPORT datagram is used to report current I/O values, as shown in Figure 4.2.1.
Byte 0
Byte 1
Byte 2
Byte 3
WSN802G Protocol Identifier = 0x52464D49
Opcode = 0x0001
Transaction ID = varies
Timestamp [7..4]
Timestamp [3..0]
MAC Address Bytes [5..2]
MAC Address Bytes [1..0] (sender)
ADC0
ADC1
VOLT
RSSI
GPIO
Figure 4.2.1
The fields specific to this datagram are:
Timestamp: Timestamp of reading in 7.62939 µs timer ticks since startup
MAC Address: As an IO_READ - IO_REPORT can be sent unsolicited, the MAC ad-
dress is provided to identify the sender, which can be helpful in situations
where DHCP is used and the IP address is initially unknown or if the
sender’s IP address has been exchanged do to NAT.
ADC0: Current ADC0 reading, only the low 10 bits are significant
ADC1: Current ADC1 reading, only the low 10 bits are significant
VOLT:Current module voltage reading, 16-bit count in millivolts
RSSI: Current RSSI reading, only the low 10 bits are significant
GPIO: Current GPIO states, only GPIO lines defined as inputs are valid
The module generates an IO_READ - IO_REPORT datagram based on the AutoReportInterval and in
response to an IO_READ_REQUEST.
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4.3 I/O Write GPIO
The IO_WRITE_GPIO datagram is used to set module outputs, as shown in Figure 4.3.1.
Byte 0
Byte 1
Byte 2
Byte 3
WSN802G Protocol Identifier = 0x52464D49
Opcode = 0x0002
Transaction ID = varies
GPIO
Figure 4.3.1
The field specific to this datagram is:
GPIO:States for GPIO lines defined as outputs. Setting a GPIO bit to 1 sets its
output to 3.3 V, setting a bit to 0 sets its output to 0 V.
The module responds to an IO_WRITE_GPIO with an IO_WRITE_REPLY.
4.4 I/O Write PWM
The IO_WRITE_PWM datagram is to set the PWM0 output , as shown in Figure 4.4.1.
Byte 0
Byte 1
Byte 2
Byte 3
WSN802G Protocol Identifier = 0x52464D49
Opcode = 0x0003
Transaction ID = varies
PWM0
Reserved
Figure 4.4.1
The field specific to this datagram is:
PWM0: PWM0 setting, 16-bit unsigned value
The module responds to an IO_WRITE_PWM with an IO_WRITE_REPLY.
4.5 I/O Write Reply
An IO_WRITE_REPLY datagram is sent by the WSN802G module to confirm receipt of an
IO_WRITE_GPIO, or IO_WRITE_PWM datagram, as shown in Figure 4.5.1.
Byte 0
Byte 1
Byte 2
Byte 3
WSN802G Protocol Identifier = 0x52464D49
Opcode = 0x0004
Transaction ID = varies
Status
Figure 4.5.1
The field specific to this datagram is:
Status: 0x0000 = successful, 0x0001 = failed
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