User's Manual

WM_PRJ_Q2400_PTS_002 - 004
March 5, 2004
2.7 Main serial link (UART1)
A flexible 6-wire serial interface is available complying with V24 protocol signaling but not with V28
(electrical interface) due to a 2.8 Volts interface.
The signals are:
• TX data (CT103/TX),
• RX data (CT104/RX),
• Request To Send (CT105/RTS),
• Clear To Send (CT106/CTS),
• Data Terminal Ready (CT108-2/DTR),
• Data Set Ready (CT107/DSR).
The set of serial link signals can be required for GSM DATA services application and is generated
by the general purpose I/O provided by the WISMO module.
The 2 additional signals are Data Carrier Detect (CT109/DCD) and Ring Indicator (CT125/RI).
Pin description
Signal Pin number I/O I/O type Description
CT103/TXD1 39 I CMOS Transmit serial data
CT104/RXD1 32 O 1X Receive serial data
CT105/RTS1 30 I CMOS Request To Send
CT106/CTS1 37 O 1X Clear To Send
CT107/DSR1 36 O 1X Data Set Ready
CT108-2/DTR1 34 I CMOS Data Terminal Ready
CT109/DCD1 * 51 O CMOS / 2X Data Carrier Detect
CT125/RI1 ** 54 O CMOS / 2X Ring Indicator
CT102/GND Shielding legs Ground
* Multiplexed with GPIO3
** Multiplexed with GPIO2.
The rising time and falling time of the reception signals (mainly CT103) have to be less than 200 ns.
The WISMO Quik Q24x6 sub-series has been designed to be operated using all the serial interface
signals. In particular, it is necessary to use RTS and CTS signals for hardware flow control in order
to avoid data corruption during transmission.
2.8 Auxiliary serial link (UART2)
For future applications (e.g. Bluetooth connectivity) an auxiliary serial interface (UART2) will be
available on Q24x6A and Q24x6B products.
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