RN4677 datasheet(12/31 Pages) MICROCHIP

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RN4677 Bluetooth® 4.0 Dual Mode Module User’s Guide

DS50002377A-page 12

 2015 Microchip Technology Inc.

1.3

ACCESSING THE RN4677 OVER UART

A terminal emulator, such as Tera Term (Windows) or CoolTerm (Mac OS-X®), can be

used to control RN4677 from a computer.

With RN4677 connected to a computer and a serial port enumerated for the UART port,

run the terminal emulator to open the COM port with the following port settings:

• Baud rate 115,200 bps

•8 bits

•No Parity

• 1 stop bit

• Hardware flow control disabled

To enter Command mode, type $$$ into the terminal emulator. Once RN4677 enters

Command mode, the string CMD> must be sent to UART to indicate the start of

Command mode session. Once in Command mode, valid ASCII commands can be

issued to control or configure RN4677. All commands end with <cr> key (carriage

return <cr>), and are always responded by RN4677. The next command must not be

issued prior receiving a response to the previous command. For Set or Action

commands, the positive response is AOK and negative response is either ERR for error

or ? for unknown command. By default, when the RN4677 is ready to receive the next

command, the command prompt CMD> is sent to UART. Users can turn off this feature

by using command S> to ensure that the interface is backward compatible with

RN41/42/52/4020.

To return to Data mode, type ---<cr>. RN4677 automatically enters Data mode once

it connects or disconnects with another device.

1.4

OPERATING MODES

RN4677 has several operating modes that the user can set using the command SM.

• Slave mode (SM,0) - Default mode, in which other Bluetooth devices can

discover and connect to the module. Outbound connections can be initiated in this

mode.

• Master mode (SM,1) - In this mode, the RN4677 module is not discoverable. The

module makes a connection when a connection command C is received. Refer to

command C for possible parameters for establishing connections.

• Auto-Connect Master mode (SM,3) - In this mode, the module automatically

makes connections on power-up and reconnects when the connection is lost. In

this mode, RN4677 automatically enters Fast mode, same as issuing command

F,1, therefore $$$ cannot enter Command mode. If an address is not stored,

RN4677 automatically enters Master mode.

• Paring mode (SM,6) - In this mode, the module attempts to connect to the remote

device that matches the stored remote address. To set the remote address, use

command SR.

Note: The module supports Fast Data mode. In this mode, the module does not

enter Command mode even if it receives $$$. To enable Fast Data mode,

use command F,1.

Note: Any changes to the device configuration using the set S commands do not

take effect until the device is rebooted using the reboot command R,1 or

power cycle.

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