User's Manual

page 26/51
HiAll
NC
User Manual 2012/06/28
command after power up sequence or wake up from sleep mode.
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UART1_RI signal is a stand alone signal that can be used with any one of the following configuration.
Consult the AT command specification for more information about this signal and its use.
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This configuration allows to use the flow control UART1_RTS & UART1_CTS to avoid any overflow error
during the data transfer, UART1_CTS is moreover used to signal when the HiAll
NC
is ready to receive an AT
command after a power up sequence or a wake up from sleep mode.
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However this configuration does not allow signals such as:
• UART1_RI signal used when programmed to indicate an incoming voice or data call or SMS incoming
etc…
• UART1_DCD signal used to indicate DATA connections.
• UART1_DTR signal used to indicate module UART interface is ON.
• UART1_DSR signal is used to prevent HiAll
NC
from entering sleep mode or to switch between DATA
and AT commands or to hang up a call or to wake up the module etc….
3.5.4 Partial V24 (RX-TX) – connection HiAll
NC
- host
When using only UART1_RXD/ UART1_TXD instead of the complete V24 link, the following schematic could be
used.
Figure 20: Partial V24 connection (2 wires) of HiAll
NC
to host processor
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As UART1_DTR is active (low electrical level) once HiAll
NC
is switched on, UART1_DSR is also active
(low electrical level), therefore the AT command “AT+KSLEEP” can switch between the two available sleep
modes.
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As UART1_RTS is active (low electrical level) once HIALLNC is switched on, UART1_CTS is also active
(low electrical level), therefore the AT command “AT+ KSLEEP” can switch between the two available sleep
modes. The HiAll
NC
firmware allows activation of UART1_RTS during sleep state even when looped to the
UART1_CTS signal.
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Note that this configuration does not allow the below signals:
• UART1_RI signal used when programmed to indicate an incoming voice or data call or incoming SMS
etc….
• UART1_DCD signal used to indicate GPRS connections.
• UART1_DTR signal used to indicate the module UART interface is ON.
• UART1_DSR signal used to prevent the HiAll
NC
module from entering sleep mode.