WM_PRJ_M13_UGD_001 - 001
20th July 2004
© 2004
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7.3 RS232 serial link
7.3.1 General presentation
The RS232 interface performs the voltage level adaptation (V24/CMOS ⇔
V24/V28) between the internal WISMO module (DCE) and the external world
(DTE).
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
MODEM
M1306B
(DCE)
DTE
CT103 / TX
CT108-2 / DTR
CT105 / RTS
CT104 / RX
CT106 / CTS
CT107 / DSR
CT109 / DCD
CT125 / RI
Figure 14: RS232 Serial Link signals
RS232 interface 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 not used.
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