WM_PRJ_Q2400_PTS_005 -007
18th January 2006
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Typical Implementation:
Figure 5: Example of keyboard implementation
2.2.5 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 input (CT103/TX),
•
RX data output (CT104/RX),
•
Request To Send input (CT105/RTS),
•
Clear To Send output (CT106/CTS),
•
Data Terminal Ready input (CT108-2/DTR),
•
Data Set Ready output (CT107/DSR).
Note: the WISMO Quik Q24x6 module is a DCE (Data Communication
Equipment).
The Q24x6 sub-series has been designed to allow a certain flexibility in the use
of the serial interface signals. However, the use of TX, RX, CTS and RTS signals
is mandatory which is not the case for DTR, DSR, DCD and RI signals which can
be left disconnected if not used.
In particular, it is necessary to use RTS and CTS for hardware flow control in
order to avoid data corruption during transmission.
The rising time and falling time of the reception signals (mainly CT103) have to
be less than 200 ns.
The 2 additional signals are Data Carrier Detect (CT109/DCD) and Ring Indicator
(CT125/RI).
