Hardware Interface Description - Wireless Data Modules

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MC55/56 Hardware Interface Description Confidential / Released s 3.9.1 Features supported on first and second serial interface ASC0 • 8-wire serial interface • Includes the data lines /TXD0 and /RXD0, the status lines /RTS0 and /CTS0 and, in addition, the modem control lines /DTR0, /DSR0, /DCD0 and /RING0. • It is primarily designed for voice calls, CSD calls, fax calls and GPRS services and for controlling the GSM engine with AT commands. Full Multiplex capability allows the interface to be partitioned into three virtual channels, yet with CSD and fax services only available on the first logical channel. Please note that when the ASC0 interface runs in Multiplex mode, ASC1 cannot be used. For more detailed characteristics see [11]. • The /DTR0 signal will only be polled once per second from the internal firmware of MC55/56. • The /RING0 signal serves to indicate incoming calls and other types of URCs (Unsolicited Result Code). It can also be used to send pulses to the host application, for example to wake up the application from power saving state. For further details see Chapter 3.12.2.3. • Autobauding is only selectable on ASC0 and supports the following bit rates: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400 bps. • Autobauding is not compatible with multiplex mode, see [11]. ASC1 • 4-wire serial interface • Includes only the data lines /TXD1 and /RXD1 plus /RTS1 and /CTS1 for hardware handshake. This interface is intended for voice calls, GPRS services and for controlling the GSM engine with AT commands. It is not suited for CSD calls, fax calls and Multiplex mode. • On ASC1 no RING line is available. The indication of URCs on the second interface depends on the settings made with the AT^SCFG command. For details refer to [1]. ASC0 and ASC1 • Both interfaces are configured for 8 data bits, no parity and 1 stop bit, and can be operated at bit rates from 300bps to 230400 bps. • XON/XOFF software flow control can be used on both interfaces (except if power saving is active). Table 13: DCE-DTE wiring of 1 st serial interface V.24 circuit DCE DTE Pin function Signal direction Pin function Signal direction 103 /TXD0 Input /TXD Output 104 /RXD0 Output /RXD Input 105 /RTS0 Input /RTS Output 106 /CTS0 Output /CTS Input 108/2 /DTR0 Input /DTR Output 107 /DSR0 Output /DSR Input 109 /DCD0 Output /DCD Input 125 /RING0 Output /RING Input MC55/56_hd_v02.06 Page 52 of 105 29.10.2004
MC55/56 Hardware Interface Description Confidential / Released s Table 14: DCE-DTE wiring of 2 nd serial interface V.24 circuit DCE DTE Pin function Signal direction Pin function Signal direction 103 /TXD1 Input /TXD Output 104 /RXD1 Output /RXD Input 105 /RTS1 Input /RTS Output 106 /CTS1 Output /CTS Input MC55/56_hd_v02.06 Page 53 of 105 29.10.2004
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