User`s guide

RN-WIFLYCR-UG
www.rovingnetworks.com Version 1.2r 4/30/13 page 56
When the module wakes up from sleep, it takes time (in milliseconds) to initialize the
internal hardware. During this time, any data that is sent to the WiFly module over the
UART is not processed. You can monitor signals that indicate the module is ready to
accept data, as described in Table 3 - 7 .
After the module wakes, you can open a TCP connection to a remote host in a number
of ways, as described in Table 3 - 8 . You set the remote host using the following com-
mands:
set ip host <address> OR
set dns name <string> // Sets the host’s IP address OR URL
set ip remote <value> // Sets the port number on which the host
// is listening
save // Save the settings in the configuration
// file
reboot // Reboot the module so that the settings
// take effect
Wake timer Internal RTC The wake timer wakes the module based on the set sys wake <value> com-
mand setting.
FORCE AWAKE FORCE
AWAKE pin
An input pulse of at least 31 s (3.3 V) wakes the module.
TABLE 3-6: METHODS FOR WAKING THE MODULE (SHEET 2 OF 2)
Method Interface Description
TABLE 3-7: SIGNALS INDICATING THE MODULE CAN ACCEPT DATA
Method Interface Description
RTS transition RTS pin When the WiFly module wakes up, the RTS pin goes high. Once the module is
ready, the RTS pin is driven low. You can monitor this pin with a microcontroller.
Monitor GPIO4 Alternative
GPIO functions
Set the alternative functions for GPIO4, GPIO5, and GPIO6 (see “GPIO4, 5 & 6
Alternative Functions” on page 49). When the module wakes up and connects to
an access point, GPIO4 goes high, indicating the module is ready to receive data
over the UART. A microcontroller can monitor GPIO4.
Sensor power Sensor power
pin
You can configure the module to output Vbat, or 3.3 V or 1.2 V on the sensor
power pin when it wakes from sleep, indicating it is ready to accept data.
TABLE 3-8: METHODS OF CONNECTING TO A REMOTE HOST
Method Type Description
Auto connect Internal RTC
timer
Connect to the host at specific time intervals based upon the set sys autoconn
<value> command setting.
Open UART In command mode, issue the open command.
Connect on UART
data
UART mode 2 This mode is designed for the HTML client feature. Use the set uart mode 2
command to connect the to host automatically when UART data is received.
GPIO5 Alternative
GPIO func-
tions
Set the alternative functions for GPIO4, GPIO5, and GPIO6 (see “GPIO4, 5 & 6
Alternative Functions” on page 49). Set GPIO5 high to trigger a TCP connection
and low to disconnect.