User's Manual

LISA-U1/LISA-H1 series - System Integration Manual
3G.G2-HW-10002-2 Advance Information System description
Page 51 of 116
The “wake-up via data reception” feature can’t be disabled.
The “wake-up via data reception” feature can be used in both +UPSV=1 and +UPSV=2 case (when RTS
line is set to OFF).
In command mode, if HW flow control is not implemented by the DTE, the DTE must always send a
dummy “AT” to the module before each command line: the first character will not be ignored if the
module is in active-mode (i.e. the module will reply “OK”), or it will represent the wake up character if
the module is in idle-mode (i.e. the module won’t reply).
No dummy “AT” is required from the DTE during connected-mode since the module continues to be in
active-mode and doesn’t need to be woken-up. Furthermore in data mode a dummy “AT” would affect
the data communication.
1.9.2.4 UART application circuits
Providing the full RS-232 functionality (using the complete V.24 link)
For complete RS-232 functionality conforming to ITU Recommendation [3] in DTE/DCE serial communication, the
complete UART interface of the module (DCE) must be connected to the DTE as described in Figure 27.
LISA-U1/LISA-H1 series
(DCE)
TxD
Application Processor
(DTE)
RxD
RTS
CTS
DTR
DSR
RI
DCD
GND
15
TXD
12
DTR
16
RXD
13
RTS
14
CTS
9
DSR
10
RI
11
DCD
GND
Figure 27: Interface application circuit with complete V.24 link in DTE/DCE serial communication