User's Manual

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HiAll
NC
User Manual 2012/06/28
HiAll
NC
module has another reduced UART port. Its application is similar as the reduced case of main UART.
Thus, this document describes only for main UART in the following chapter.
3.5.1 Complete V24 connection of HiAll
NC
to host
HiAll
NC
provides a V24 interface with the following signals: UART1_RTS/ UART1_CTS, UART1_RXD/
UART1_TXD, UART1_DSR, UART1_DTR, UART1_DCD, UART1_RI.
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Use of this complete V24 connection is required whenever your application exchanges data.
Figure 15: Complete V24 connection of HiAllNC to host processor
This configuration allows the use of the flow control UART1_RTS & UART1_CTS to avoid overflow error during
the data transfer. In addition, UART1_RTS is used to inform DTE whether the HiAll
NC
is ready to receive an AT
command after power up sequence or wake up from the sleep mode.
Figure 16: UART1_CTS versus POK_IN signal during the power on sequence.
This signal configuration also enables all signals:
• UART1_RI signal is used when programmed to indicate an incoming voice or data call or SMS incoming
message etc…
• UART1_DCD signal is used to indicate GPRS connections.
• UART1_DTR signal is used to indicate that the module’s UART interface is ON.
• UART1_DSR signal is used to prevent the HiAll
NC
from entering sleep mode, switching between Data
and AT commands, hanging up a call or waking up the module etc.