User's Manual

– – HILONC- 3GPS APPLICATION NOTE
GND is not reprenested.
HiLoNC3GPS
pin60
pin17
pin59
pin16
pin15
pin14
pin58
pin61
UART1_TX
UART1_RX
UART1_RTS
UART1_CTS
UART1_DSR
UART1_DTR
UART1_DCD
UART1_RI
DTE_RX
DTE_TX
DTE_CTS
DTE_RTS
DTE_DTR
DTE_DSR
DTE_DCD
DTE_RI
DTE device
470K
External 1.8V
3.5.3. Partial V24 (RX-TX-RTS-CTS) Connection of HILONC-3GPS to host
When using only
RX/TX/RTS/CTS
instead of the complete V24 link, the following schematic can be used:
HiLoNC3GPS
pin60
pin17
pin59
pin16
UART1_TX
UART1_RX
UART1_RTS
UART1_CTS
DTE_RX
DTE_TX
DTE_CTS
DTE_RTS
DTE device
UART1_DSR
pin15
UART1_DTR
pin14
UART1_DCD
pin58
NC
UART1_RI
pin61 NC
GND is not represented.
: Partial V24 connection (4 wires) of HILONC-3GPS to host
 As
UART_DTR
is active (low electrical level) once HILONC-3GPS is switched on,
UART_DSR
is also active
(low electrical level), therefore the AT command AT+Ksleep can switch between the two sleep modes
availableHILONC.

UART_DCD
and
UART_RI
can remain disconnected and floating when not in
use. Otherwise use 100KΩ
to
pull power up to 1.8V.
This configuration allows use of flow control RTS & CTS to avoid overflow error during data transfer. Moreover
UART_RTS
is used to indicate when the HILONC-3GPS module is ready to receive an AT command after
power up sequence or wake up from sleep mode.
 However this configuration does not allow signals such as:
· UART_RI
signal used when programmed to indicate an incoming voice or data call or incoming SMS
etc…
.
· UART_DCD
signal used to indicate DATA connections.
· UART_DTR
signal used to indicate module UART interface is ON.
Note d’étude / Technical document :
01/08/20111 - Page 18 / 41