Specifications

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1. Introduction
This document defines the communication protocol through UART (Seral port) between the
“BnCOM Module” (hereinafter “BT”)and the client’s MCU (hereinafter “HOST”) connected by
UART interface.
Protocol Basic Rule
Data transmission/reception between HOST and BT is made based on UART (serial port)
interface.
◼ Baud rate : 230400 bps
◼ Data bit : 8
◼ Parity bit : none
◼ Stop bit : 1
◼ Flow control : RTS/CTS Enable
The above are default setting values. In case you want to change them, please make a
request for modification when writing BT firmware or modify them using the
corresponding AT command (AT+BTUART=B,P,S).
Communication Direction
◼ REQUEST (HOST→BT) : Generated from HOST and transmitted to BT.
◼ NOTIFY(BT → HOST) : A message that occurs in BT and is delivered to HOST. It informs
the basic status of BT.
◼ RESPONSE(BT → HOST) : A message that occurs in BT and is delivered to HOST. It
informs the basic status of BT.
Communication Rule
All protocols consist of a combination of ASCII values, the protocol command informs the
end of the instructions over a Carriage Return (0x0D).
Ex) REQUEST – Recent Device Connections : AT+CONNECT⤶
Command
AT+CONNECT
Command set
A
T
+
C
O
N
N
E
C
T
\r
Ascii set
0x41
0x54
0x2B
0x43
0x4F
0x4E
0x4E
0x45
0x43
0x54
0x0D