User's Manual

Note d‘étude / Technical document :
URD1– OTL 5696.1– 003 / 72361 Edition 02
HILO 3G Application Note
17 January 2011 - Page 18 / 38
UART_RX
Receive data
UART_RTS
Wakes up the module when Ksleep=1 is used
UART_RI
Signal incoming calls (voice and data), SMS, etc.
UART_DTR
Prevents the HiLo3G from entering into the sleep mode
Switches between the data mode and the command modes
Wakes up the module.
3.5.1 Complete V24—Connection HiLo3G -host
A V24 interface is provided on the 40 pins of the HiLo3G module with the following signals: RTS/CTS, RXD/TXD, DSR,
DTR, DCD, RI.
The use of this complete V24 connection is required whenever your application exchanges data.
Figure 17: Complete V24 connection between the HiLo3G and the host
This configuration allows the use flow control RTS & CTS to avoid any overflow error during data transfer. Also, CTS is
used to signal when the HiLo3G is ready to receive an AT command after a power up sequence or a wake up from the sleep
mode.