User guide

RN Commands Version 4.25, 11/1/2007 Page 16 of 25
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The default profile is Serial Port Profile (SPP). The firmware also supports the DUN profile in both master and
slave modes. To change the profile, use the “S~,<num>” command.
Profile:
0 - Default SPP. (no modem control)
1 - DUN DCE (slave or gateway).
2 - DUN DTE ( master or client).
3 - MDM SPP with modem control signals.
The most common use of DUN profile is to enable a BT client to connecti to a dialup modem. For this mode, use
profile 1 (DUN DCE) via command “S~,1” . You may also want to set the Class Of Device so that clients can
recognize the device as a Bluetooth modem. The correct COD for a Bluetooth modem is 0x040210. This can be
set using the commands below:
“SC,0004”
“SD,0210”
A number of modem control signals are supported when in DUN or MDM modes and their use is described below.
4.2 PIOs used as modem control signals
The Firefly and RN-XX modules have the ability to replicate the required modem control hardware signals
automatically once a connection is made. These signals are transferred outside the data channel (using
RFCOMM control channels) and are automatically updated. The default SPP profile (profile=0) does NOT drive
these signals or report back inputs. If DUN or MDM profiles are enabled (pofile =1,2, or 3), the following
signals are automatically driven and received.
Inputs: (read and sent back over Bluetooth to the remote host).
PIO3 = DCD ( switch 2)
PIO6 = DSR (switch 3)
PIO7 = CTS (switch 4)
Inputs are ACTIVE LOW.
Outputs: (sent from the remote Bluetooth host, and driven out )
PIO10 = DTR - this is ACTIVE HIGH
PIO11 = RTS - this is ACTIVE LOW.
On the Firefly, the DIP switches can also be used to set/clear the DCD, CTS, and DSR signals. DTR and RTS are
available on the 9 pin header as well.