Quatech RS-485 - Manual (Page 14)

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E. PIN Code
PIN code is for the purpose of security consideration during as like a
pass key. Device uses this “PIN Code” to identify during connecting
and communication.
F. Role
Role is for identifying a role of the device as a master or slave. The
item of “Role” is chose “Master”. The device will be play like a DTE
mode - Data Terminal Equipment (such as a PC). If the item of “Role”
is chose “Slave” and the device will be play like a DCE - Data
Communication Equipment (such as a Modem)
You can setup this Bluetooth adapter device as what type of the
RS232 device you are going to connect in DTE or DCE mode to work
with it.
G. Discoverable
The item of discoverable is for allowing (or not ) the device is detected
by other Bluetooth devices.
H. Baud Rate
The item of baud rate is for the pack transmission speed. The baud
rate range is from 120 bps～115.2K bps and depend on transmission
distance and environments. Normally, the parameter of baud rate is
sat around 9600 bps.
I. Handshake(DSR/DTR)
The item of handshake is set at the “Disable” item.
J. Stop Bit
The item of stop bit is set at the “One Bit” item.
K. Parity