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