User's Manual

Default: Bonded MAC Address
Example: E,0,00035B0358E6 // Connect to peripheral with
// public address 00035B0358E6
3.3.2.6 F,<hex16>,<hex16>
Command “F” is only available to device as central or observer role. For central
device, it is used to inquiry the peripheral devices before establishing connection.
For observer, it is used to receive broadcast messages.
If no parameter is provided, command “F” starts the process of connection with
default scan interval of 375 milliseconds and scan window of 250 milliseconds. User
has the option to specify the scan interval and scan window as first and second
parameter respectively as 16bit hex value in millisecond.
Default: 375ms for scan interval, 250ms for scan window
Example: F,012C,00C8 // Start Inquiry with 300ms scan interval
// and 200ms scan window
3.3.2.7 H
Command “H” sends help page to UART. The help page is grouped into “Set
Commands”, “Action Commands”, “Service Commands”, “Private Service Commands”
and “MLDP Commands”. According to the feature settings from “Set Commands”, the
help page displays only commands that are applies to current settings.
Command “H” has no parameter.
Example: H // Display the help page
3.3.2.8 J,<0,1>
Command J put the device into or out of observer role.
If the input parameter is 1, RN4020 enters observer mode. After issuing command
“F”, RN4020 could receive undirected, un-connectable advertisement from
broadcasters.
If the input parameter is 0, RN4020 exits observer mode.
Example: J,1 // Enter observer mode. To receive broadcast,
// command “F” must be issued.