F35-XXL Hardware description - Falcom

F35-XXL HARDWARE DESCRIPTION VERSION 1.10
Signal On MC39i
Name Type
Connected to UART
Port A(/dev/ser2)
Description
RTS Input RTSA Ready to send
DTR Input DTRA Data Terminal Ready
DSR Output DSRA Data Set Ready
DCD Output DCDA Data Carrier Detect
RI* Output RIA Ring
Table 7: Serial interface of the MC39i
*
For more details see chapter “ Ring- ”.
The data interface is implemented as a serial asynchronous transmitter and
receiver conforming to ITU-T RS232 Interchange Circuits DCE. It has fixed
parameters of 8 data bits, no parity and 1 stop bit and can be selected in the
range of 1.2 kbps up to 115 kbps for auto bauding and in the range of 300
baud to 115 kbps for manual settings. Hardware handshake using signals
RTS0/CTS0 and software flow control via XON/XOFF are supported.
In addition, the modem control signals DTR *) , DSR and DCD are available.
Different modes of operation can be handled by AT commands.
For more information about signal levels of the serial interface see chapter
4.
5.2.4 Control signals
*) The DTR signal will only be polled once per second from the
internal firmware of MC39i!
The following control signals are available (2.65 V CMOS level).
5.2.4.1 Ring- MC39i
The RING0- MC39i pin is connected to the RI-UART pin.
The behaviour of the RING0 line depends on the type of the call received.
- When a voice call comes in the RI line goes low for 1 s and high for
another 4 s. Every 5 seconds the ring string is generated and sent over
the RXD0 line.
If there is a call in progress and call waiting is activated for a connected
handset or hands free device, the RING0 witches to ground in order to
generate acoustic signals that indicate the waiting call.
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