User's Manual

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Note d’étude / Technical document : URDx– OTL 5635.1– 007 / 70 230 Edition 03
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Figure 12: connection to a data cable
3.6.3 Partial V24 (RX-TX-RTS-CTS) – connection HiLo - 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 HiLo is switched on.
DCD and RI can stay not connected and floating.
RXD
TXD
RTS
CTS
DCD
RI
DTR
DSR
RXD
TXD
RTS
CTS
DCD
RI
DTR
DSR
DCE
(HiLo)
DTE
(Host)
GND GND
Figure 13: Partial V24 connection (4 wires) between HiLo and host
3.6.4 Partial V24 (RX-TX) – connection HiLo - host
When using only RX/TX instead of the complete V24 link, we recommend following schematic: