Fastrack Supreme User Guide
Functional Description
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Page: 52 / 77
The RS232 interface is internally protected (by ESD protection) against electrostatic surges on the RS232
lines.
Filtering guarantees:
•
EMI/RFI protection in input and output,
•
Signal
smoothing.
Signals available on the RS232 serial link 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),
•
Data Carrier Detect (CT109/DCD),
•
Ring Indicator (CT125/RI).
FASTRACK
Supreme
(DCE)
DTE
CT103 / TX
CT108-2 / DTR
CT105 / RTS
CT104 / RX
CT106 / CTS
CT107 / DSR
CT109 / DCD
CT125 / RI
Figure 16: RS232 Serial Link signals
RS232 interface has been designed to allow 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 not used.
7.4.2
Autobauding Mode
The autobauding mode allows the FASTRACK Supreme to detect the baud rate used by the DTE connected
to the RS232 serial link.
Autobauding mode is controlled by AT commands. See "AT Commands Interface Guide" [6] for details on
this function.