User's Manual

page 21/46
Note d’étude / Technical document : URD1 – 5625.1 – 006 / 69796 Edition 03
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An example of connection between MO300 and a PC is given below.
Figure 21
Signal adaptation using Level Shifters and RS232 Transceiver.
3.5.3 Partial V24 ( RX-TX-RTS-CTS) – connection MO300 - host
When using only RX/TX/RTS/CTS instead of the complete V24 link, we recommend following schematic:
As we need DTR active (low electrical level), a loop DSR on DTR is sufficient because DSR is active (low
electrical level) once the XS200 is switched on.
DCD and RI can stay not connected and floating.
Figure 22
Partial V24 connection (4 wires) between MO300 and host
RXD
TXD
RTS
CTS
MO300
DCD
DTR
DSR
RI
GND
RXD
TXD
RTS
CTS
Host
DCD
DTR
DSR
RI
GND