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specified in S Register 519 then the connection is dropped as if an ATH
command was received.
2 PIO2 (RI), is normally deasserted. When an incoming connection
is detected it will be asserted, until the connection is either answered or
rejected using ATA and ATH respectively. See S Registers 552 & 553
for more details
3 PIO3 (DCD) will be deasserted when the device is in the
unconnected state. Asserted when a connection is active. See S
Registers 552 and 553 for more details.
4 PIO5 is either used as GPIO or driven as UART_DTR. When the
unit is configured in pure host mode, this pin is forced into UART_DTR
and is asserted when there is a Bluetooth connection.
GPIO Pins 1,2,3,4 and 5 are available for general purpose use.
6.1 Modem signalling over Bluetooth
The RFCOMM protocol used in Bluetooth for implementing the serial
port profile allows for the exchange of four modem signals. This
information is contained in a special transparent message which
contains bits identified as RTR, RTC, DV and IC which depending on the
type of serial device being emulated maps to DTR or DSR, RTS, DCD
and RI respectively. In addition, this message also includes the ability to
convey a BREAK input from one end to the other.
So to allow for the greatest flexibility and variability in how the modem
control signals are used out in the real world, S Registers 551, 552 and
553 have been provided which allow for any of RTR,RTC,DV and IC to
be mapped to any modem control/status line.
6.2 BREAK signal on RX line
If the host sends a break signal of duration greater than 100ms, then the
blu
2i
module is configured to treat that as a signal to perform a hardware
reset.
This being the case it is not possible to convey a BREAK over Bluetooth
to the peer device.
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