User Manual

G610 GPRS Module Hardware User Manual Page 23 of 47
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#
G610
Signal name
Description Feature Direction
45 RXD_N
Module
Transmitted Data
DTE
Received Data
DCE→DTE
44 TXD_N
Module
Received Data
DTE
Transmitted Data
DTE→DCE
39 RING_N
Module
Ring indicator
Notice DTE Remote
Call
DCE→DTE
38 DSR_N
Module
Data Set Ready
DCE Was Ready DCE→DTE