TDK blu2i 用户手册

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The module has the capability of being preset into a pure 5-wire data 
cable replacement mode. The 5 wires being RX, TX, CTS, RTS and 
GND. This mode requires no changes to a host application since the 
Bluetooth connection is automatically set up on power up and will retry 
when the connection drops. 
 
By implication, two devices are needed to replace a cable. One device is 
pre-configured to always be a master and the other, a slave. 
 
Assuming the Bluetooth address of the master to be <bdaddr_m> and 
that of the slave to be <bdaddr_s>, the master module is configured by 
sending it the following AT commands. 
 
AT&F 
ATS512=1 
ATS504=1 
ATS507=2 
ATS530=2000 
AT&W 
AT+BTR<bdaddr_s> 
 
Where the ATS507=2 setting puts the device in DSR drop mode only. 
This means that when the device needs to be reconfigured, deasserting 
the DSR line will ensure that the module responds quickly to AT 
commands. This further means that in stand alone mode, the DSR input 
line MUST be asserted e.g. 0v in TTL signal mode. 
 
The slave is configured by, 
 
AT&F 
ATS512=4 
ATS0=-1 
AT&W 
AT+BTR<bdaddr_m> 
 

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