Roving Networks RN-XV-RD2 User manual

 
RN
-
XV
-
RD2
-
EVAL
-
UM
RN-XV-RD2 Evaluation Board
USER MANUAL
© 2012 Roving Networks. All rights reserved.
RN-XV-RD2-EVAL-UM-1.01Version 1.0 9/28/2012


www.rovingnetworks.com Version 1.01 9/28/2012 2
RN
-
XV
-
RD2
-
EVAL
-
UM
OVERVIEW
This document describes the hardware and software setup for Roving Networks RN-XV-RD2 evaluation board, which
allows you to evaluate the RN-XV 802.11 b/g module. The RN-XV module, which is sold separately, mounts to the
evaluation board and contains the RN-171 Wi-Fi module. Table 1 describes the board’s components.
                 
Component
Description
Connector socket for the RN-XV The RN-XV module’s pins slide into the socket.
Three status LEDs These LEDs mimic the LEDs on the RN-XV.
Four pushbutton switches These switches are hard-wired to the RN-XV module and provide reset, ad hoc/WPS
mode, access to sensor 2, and access to GPSW (GPIO14).
Two 10-amp, 250-V relays The board has two relays with connectors (J7 and J6) that you can connect to a variety
of electronics or appliances. After you have programmed the module, you can operate
the connected electronics remotely over Wi-Fi.
Built-in temperature sensor The board includes a temperature sensor (SEN5) that allows the module to wake or
sleep depending on the ambient temperature.
External temperature probe connector You can attach an external temperature probe to the board using the connector at
SEN3.
USB cable A USB cable connected to the board allows you to connect directly from the board to
your computer, e.g., for programming the module over the UART.
10 GPIO pins The board contains access to 10 GPIO pins via the 3.3-V headers at J3 and J5.
Voltage regulator The voltage regulator controls the voltage levels on the board.
You can configure and program the WiFly module using the command interface, create connections, and transfer
data. The command interface is made up of simple ASCII commands. See “Resources & Related Documents” on
page 15 for information on available documentation.
Evaluation Board Description
The RN-XV-RD2 evaluation board connects to your computer using a USB cable. To evaluate the RN-XV module on
the evaluation board, you need a computer with a USB port running either the Microsoft Windows or Mac OS-X
operating system.
NOTE: Before beginning your evaluation, you must install the FTDI drivers for the USB cable. You can download
the drivers (as well as other tools and utilities) from the Roving Networks website at
http://www.rovingnetworks.com/support.php.
Figure 1 shows the RN-XV-RD2 evaluation board and pin information. Table 2 describes the LED indicators.


www.rovingnetworks.com Version 1.01 9/28/2012 3
RN
-
XV
-
RD2
-
EVAL
-
UM
Figure 1. RN-XV-RD2 Evaluation Board
UART Interface (J2)

RX - input to evaluation board
TX - output from evaluation board
Pin
Description
1 VBUS (5 V)
2 GND
3 RXD
4 TXD
5 RTS

6 CTS
RN-XV Interface (J3)

RX - input to evaluation board
TX - output from evaluation board
Pin
Description
1 3.3 VDC output
2 TXD
3 RXD
4 GPIO8
5 RESET
6 GPIO5
7 GPIO7
8 GPIO9
9 GPIO1
10 GND
RN-XV Interface (J5)

RX - input to evaluation board
TX - output from evaluation board
Pin
Description
1 Sensor 2 (3.3-V tolerant)
2 Sensor 3 (3.3-V tolerant)
3 GPIO3
4 Sensor 5 (3.3-V tolerant)
5 CTS
6 GPIO6
7 Unused
8 GPIO4
9 RTS
10 GPIO14



www.rovingnetworks.com Version 1.01 9/28/2012 4
RN
-
XV
-
RD2
-
EVAL
-
UM
Table 2. RN-XV-RD2 Evaluation Board LED Indicators
Condition
Red LED
Yellow LED
Green LED
On solid





Connected over TCP
Fast blink

Not associated

Rx/Tx data transfer

No IP address
Slow blink

Associated, no Internet



IP address OK
Off

Associated, Internet OK



-
HARDWARE SETUP
To set up the hardware, perform the following steps:
1. Mount the RN-XV module onto the socket at M1 on the RN-XV-RD2 evaluation board. The header is not keyed;
you must orient the module as shown in Figure 2. The RN-XV provides power to the evaluation board.
2. Connect the USB cable to a USB port on your computer. Windows should automatically install the drivers for the
cable. If it does not, download and install the FTDI drivers from the Support page on the Roving Networks
website at http://www.rovingnetworks.com/support.php. Note the COM port to which you have attached the
cable.
3. Connect the USB cable to the evaluation board at J2.
4. Attach a jumper to the pins at J1 if the board if it is missing.
NOTE: If you remove the jumper, you can use these pins to probe voltage levels on the board. If, however, you
leave the J1 pins without a jumper, the board will not function.
The RN-XV supports several antenna options. The RN-XV-W, which Roving Networks recommends you use for this
evaluation, is shipped with a wire antenna. Therefore, you do not need to install a separate antenna for the evaluation
described in this document.


www.rovingnetworks.com Version 1.01 9/28/2012 5
RN
-
XV
-
RD2
-
EVAL
-
UM
CONFIGURATION
When using the standard WiFly firmware, the module operates in two modes: data mode (default) and command
mode. While in data mode, the module is essentially a data pipe. When the module receives data over Wi-Fi, it strips
the TCP/IP headers and trailers and passes the user data to the UART. When data is written to the UART, the
module constructs the TCP/IP packet and sends it out over Wi-Fi. Thus, the entire process of sending/receiving data
to the host is transparent to the end microprocessor. See Figure 2.
Figure 2. Data & Command Modes

By default, the module is in data mode. Sending the escape sequence $$$ causes the module to enter command
mode. Once in command mode, you can configure the WiFly device using simple ASCII commands. To exit
command mode and return to data mode, type exit <cr>.
Basic configuration only requires the wireless network access point’s name (SSID) and authentication password. The
WiFly module can only associate with one network at a time. Roving Networks recommends that you begin your
evaluation by configuring the WiFly module using an open access point to simplify the setup.
There are two ways to configure the WiFly module:
•Over the UART, which is connected to a computer or microprocessor
•Via Wi-Fi using ad hoc networking
You need a terminal emulator to complete the setup.
NOTE: Roving Networks suggests using either the TeraTerm (Windows OS) or CoolTerm (Mac OS-X) terminal
emulator program.
Configuration Using the RS-232 Serial Interface
The USB-to-serial cable allows your computer to communicate with the WiFly module on your evaluation board. The
following instructions describe how to use a terminal emulator to go into configuration mode, send commands to find
networks, associate with an access point, and save your configuration.


www.rovingnetworks.com Version 1.01 9/28/2012 6
RN
-
XV
-
RD2
-
EVAL
-
UM
Configure the Module Using a Terminal Emulator
To communicate with the module using a terminal emulator, perform the following steps:
1. Determine the COM port that was assigned to the USB-to-serial cable. If you do not know the COM port number,
you can find it using the Windows Device Manager, which is in the system tools. In the Device Manager, browse
and expand the selection for Ports (COM & LPT). In the example shown in Figure 3, the USB serial port is
COM9.
For OS-X, if you are using CoolTerm, you can view and select the port from within the application.
2. Open your terminal emulation program.
3. Specify the COM port. If you are using TeraTerm, select Serial and choose the COM port number from the Port
drop-down list box.
NOTE: The default serial port setting for the WiFly module is 9600 baud, 8 bits, no parity, and 1 stop bit.
Figure 3. Finding the COM Port Number in Windows

Enter Command Mode
To enter command mode, perform the following steps in the terminal emulator:
1. Type $$$. You must type $$$ together quickly with no additional characters before or after them. The module
replies with CMD to indicate it is in command mode.
2. Type show net <cr> to display the current network settings.


www.rovingnetworks.com Version 1.01 9/28/2012 7
RN
-
XV
-
RD2
-
EVAL
-
UM
NOTE: When a command completes, the terminal displays a prompt in the format <X.XX> where X.XX indicates the
module’s firmware version. In the example in Figure 4, the version is 2.28.
Figure 4. Show Current Network Settings

To issue commands to the module, you send a keyword followed by optional parameters. Commands are case
sensitive, and you cannot use spaces in parameters. Use a $to indicate a space, e.g., MY NETWORK should be
written as MY$NETWORK. Additionally, you can use shorthand for the parameters. For example, the following
commands are equivalent:
•set uart baudrate 115200
•set uart b 115200
•set u b 15200
NOTE: You cannot use shorthand for command keywords. For example, s uart baudrate 115200 is an illegal
combination.
The WiFly module supports a variety of command keywords. The Advanced User Manual, which is available on the
Support page of the Roving Networks website, provides a complete command reference. For evaluation purposes,
you may view the current settings using the get command; get everything (or get e in shorthand) shows all
parameters. Table 3 shows additional parameters for the set and get commands.
Table 3. Basic set & get Parameters
Parameter
Function
adhoc Controls the ad hoc parameters.
broadcast Controls the broadcast hello/heartbeat UDP message.
comm Communication and data transfer, matching characters.
dns DNS host and domain.
ftp FTP host address and login information.
ip IP settings.
option Optional and infrequently used parameters.
sys System settings, such as sleep and wake timers.
time Realtime clock settings.
uart Serial port settings, such as baud rate and parity.


www.rovingnetworks.com Version 1.01 9/28/2012 8
RN
-
XV
-
RD2
-
EVAL
-
UM
wlan Wireless interface, such as SSID, channel, and security options.
Find Available Networks
Once you are in command mode, you can instruct the module to search for available networks. Type scan <cr> in the
terminal emulator to view a list of Wi-Fi networks within range. See Figure 5.
Figure 5. Scan for Networks

Associate with an Access Point
You use the join keyword to associate with an open access point. As shown in the scan list, roving1 is an open
access point. To associate with an access point, type the following commands (refer back to Figure 5):
join roving1
or
join # 1 // The space must be included between # and 1
To disconnect from a network, type leave <cr>. The red LED blinks quickly when the WiFly module is not associated
with an access point.
If you want the module to associate with a network automatically upon booting (i.e., persistent configuration), use the
set wlan command with the SSID name. For example, type:
set wlan ssid roving1
save
reboot
When the module wakes or power cycles, the module attempts to associate with the network roving1 (the default
name).
To associate with a secure network you must also include the network password. The WiFly module determines the
security type automatically. In this case, type:


www.rovingnetworks.com Version 1.01 9/28/2012 9
RN
-
XV
-
RD2
-
EVAL
-
UM
set wlan ssid roving1 // roving1 is the default name
set wlan pass rubygirl // rubygirl is the default password
save
reboot
See Figure 6. You can confirm the security settings by typing get wlan <cr>.
Figure 6. Connect to a Secure Network

Configuration Using Ad Hoc Mode
You can configure the module over the air via an ad hoc network. Ad hoc networks are useful for point-to-point
communication. In ad hoc mode, the WiFly appears as an access point with which other Wi-Fi devices can associate.
You can turn on ad hoc mode using hardware or software configuration.
NOTE: the WiFly module only supports the OPEN mode for ad hoc networks.
Enable Ad Hoc Mode via Hardware
To enable ad hoc mode using hardware, set GPIO9 high (3.3 V) at power up. For the RN-134 board, GPIO9 is on pin
1 on the jumper block (J2). For the RN-174 board, GPIO9 is on the J6 connector. Upon power up with GPIO9 high,
the module creates an ad hoc network with the following settings:
SSID: WiFly-GSX-XX, where XX is the final two bytes of the device’s MAC address
IP address: 169.254.1.1
Enable Ad Hoc Mode via Software
To enable ad hoc mode in software, you use the set wlan command with the join, ssid, and chan parameters. For
example, type the following commands in command mode:
set wlan join 4
set wlan ssid my_adhoc_network
set wlan chan 1

www.rovingnetworks.com
Set the WiFly module’s
IP address and n
address, use 255.255.0.0
as the netmask
also
set the netmask to a smaller subnet if the other device’s IP addresses begin statically
ad hoc device.
set ip address 169.254.1.1
set ip netmask 255.255.0.0
Turn off D
HCP so that the module does not attempt to obtain an IP address from another device
set ip dhcp 0
Save your configuration and
reboot. The module
Figure 7. Enable Ad Hoc Network
Mode
Associate with an Ad Hoc Network
The WiFly module can associate with an ad hoc network c
set wlan ssid my_adhoc_network
save
reboot
To associate with
an ad hoc network without saving the changes to the module’s flash memory, use
command, e.g.,
join my_adhoc_network
If DHCP is enabled
, the WiFly device obtains
By definition, auto IP sets
the first two bytes of
seconds to resolve the IP address. 
To set
the IP address statically, disable DHCP
set ip dhcp 0
set ip address 169.254.1.2

Version 1.01 9/28/2012
RN
-
XV
IP address and n
etmask. Because automatic IP assignment fixes
the first two bytes of the IP
as the netmask
so that other devices connecting
to the module can be reached. You can
set the netmask to a smaller subnet if the other device’s IP addresses begin statically
at
the same subnet as
HCP so that the module does not attempt to obtain an IP address from another device
.
reboot. The module
will be in ad hoc mode. See Figure 7.
Mode

The WiFly module can associate with an ad hoc network c
reated by another device. Type the commands:
an ad hoc network without saving the changes to the module’s flash memory, use
join my_adhoc_network
<cr>.
, the WiFly device obtains
an IP address automatically when it associates
with the ad
the first two bytes of
the subnet to 169.254.xxx.xxx. The WiFly device
requires
the IP address statically, disable DHCP
and explicitly assign the IP address:
10
XV
-
RD2
-
EVAL
-
UM
the first two bytes of the IP
to the module can be reached. You can
the same subnet as
the
reated by another device. Type the commands:
an ad hoc network without saving the changes to the module’s flash memory, use
the join
with the ad
hoc network.
requires
2 to 3