Rtc Application; Serial Interfaces - Fibocom G610 Hardware User Manual

T(s) ≈ C(uF)/1.3

3.6.2 RTC Application

The G610 time and date can be set using the following methods:
 Automatically retrieved from the GSM network. In case G610 is operated in a GSM
network that supports automatic time zone updating, it will update the RTC with the local
time and date upon connection to the network. The RTC will continue to keep the time from
that point.
 Using the AT+CCLK command. Setting the time and date manually by this AT commands
overrides the automatic network update. Once the time and date are manually updated,
the RTC timer will keep the time and date synchronized regardless of the G610 operating
state.

3.7 Serial Interfaces

G610 includes one completely independent serial communications interfaces (UART).
The G610 UART is a standard 8-signal bus. This UART is used for all the communications with
G610 - AT commands interface, GPRS/EGPRS data and CSD data, programming and software
upgrades.
The UART signals are active low CMOS level signals. For standard RS232 communications
with a PC, an external transceiver is required.
G610 is defined as a DCE device, and the user application is defined as the DTE device. These
definitions apply for the UART signals naming conventions, and the direction of data flow, as
described in the figure.
G610
Pin#
45
44
39
38
G610 GPRS Module Hardware User Manual
G610
Signal name
RXD_N
Transmitted Data
TXD_N
Received Data
RING_N
Ring indicator
DSR_N
Data Set Ready
Description
Module
Module
Module Notice DTE Remote
Module
Feature
DTE
Received Data
DTE
Transmitted Data
Call
DCE Was Ready
Direction
DCE→DTE
DTE→DCE
DCE→DTE
DCE→DTE
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