Data Sheet

FSC-BT806BDatasheet
Shenzhen Feasycom Technology Co.,Ltdwww.feasycom.com
-17-
This is a standard UART interface for communicating with other serial devices. The UART interface provides a simple
mechanism for communicating with other serial devices using the RS232 protocol.
When the module is connected to another digital device, UART_RX and UART_TX transfer data between the two
devices. The remaining two signals, UART_CTS and UART_RTS, can be used to implement RS232 hardware flow control
where both are active low indicators.
This module output is at 3.3V CMOS logic levels (tracks VCC). Level conversion must be added to interface with an
RS-232 level compliant interface.
Some serial implementations link CTS and RTS to remove the need for handshaking. We do not recommend linking CTS
and RTS except for testing and prototyping. If these pins are linked and the host sends data when the FSC-BT806B
deasserts its RTS signal, there is significant risk that internal receive buffers will overflow, which could lead to an
internal processor crash. This drops the connection and may require a power cycle to reset the module. We
recommend that you adhere to the correct CTS/RTS handshaking protocol for proper operation.
Table 5: Possible UART Settings
Parameter
Possible Values
Baudrate
Minimum
1200 baud (≤2%Error)
Standard
115200bps(≤1%Error)
Maximum
4Mbaud(≤1%Error)
Flow control
RTS/CTS, or None
Parity
None, Odd or Even
Number of stop bits
1 /2
Bits per channel
8
When connecting the module to a host, please make sure to follow .
Module Host
TX RX
RX
TX
GND
GND
CTS
RTS
RTS
CTS
Figure 5: UART Connection
The UART interface resets FSC-BT806B on reception of a break signal. A break is identified by a continuous logic low (0V)
on the UART_RX terminal, as belowpicture shows. If t BRK is longer than the value defined by the PSKEY_HOSTIO_
UART _RESET_TIMEOUT, a reset occurs. This feature enables a host to initialise the system toa known state. Also,
FSC-BT806B can issue a break character for waking the host.
Figure 6: Break Signal