F35-XXL Hardware description - Falcom

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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. This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission. Page 29
F35-XXL HARDWARE DESCRIPTION VERSION 1.10 Figure 7: Incoming voice call - Likewise, when a fax or data call is received, RING0 goes low. However, in contrast to voice calls, the line remains low. Every 5 seconds the ring string is generated and sent over the RXD0 line. Figure 8: Incoming data call - An incoming SMS can be indicated by an Unsolicited Result Code (URC) which causes the RI line to go low for 1 second only. Using the AT+CNMI command you can configure the engine whether or not to send URC’s upon the receipt of SMS. For instance, enter AT+CNMI=1,1 to activate URC’s for incoming short messages. For more details please refer to the “TC3x AT command set”. RING0 Figure 9: Incoming SMS URC This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission. Page 30 1 S
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F35-XXL Hardware description - Falcom

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