User's Manual

page 25/64
Note d’étude / Technical document : URD1– OTL
5665.3 – 003 / 72238 Edition 01
Document Sagemcom Reproduction et divulgation interdites
Sagemcom document. Reproduction and disclosure prohibited

As DSR is active (low electrical level) once the HiLoNC V2 is switched on, DTR is also active (low
electrical level), therefore AT command AT+Ksleep can switch between the two sleep modes available for the
HiLoNC V2.

DTR input signal is internally pull upped to VGPIO with a 100KΩ, this result in 28µA of extra consumption.

As CTS is active (low electrical level) once the HiLoNC V2 is switched on, RTS is also active (low
electrical level), therefore AT command AT+Ksleep can switch between the two sleep modes available for the
HiLoNC V2. The HiLoNC V2's firmware allows the rise of CTS during the sleep state even when looped to RTS
signal.

DCD and RI can stay not connected and floating when not used.

RI signal is a stand alone signal that can be used with anyone of the following configuration. Consult the
AT command specification for more information about this signal and its use.
This configuration does not allow to use the flow control RTS & CTS. Those signals are used to avoid any
overflow error during the data transfer, CTS is moreover used to signal when the HiLoNC V2 is ready to receive
an AT command after a power up sequence or a wake up from sleep mode.
Figure 25: CTS versus POK_IN signal during the power on sequence.

Moreover this configuration does not allow the signalling signals like:
• RI signal used when programmed to indicate an incoming voice or data call or SMS incoming etc…
• DCD signal used to signal the GPRS connections
• DSR signal used to signal the module UART interface is ON
• DTR signal used to prevent the HiLoNC V2 module from entering into sleep mode or to switch between
Data and AT commands or to hang up a call or to wake up the module etc…

Consult the AT command Specification document for the uses of the UART signals.
4.8 UART0
HiLoNC V2 module manages a 2-wire UART interface. This UART interface is only dedicated for software
traces.

SAGEMCOM strongly recommends leaving this interface externally accessible for trace (e.g. access by
test point pads).