Network Status Indication; Buzzer - SimCom SIM548C HD V1.01 Hardware Design

SIM548C Hardware Design

3.16 Network status indication

The NETLIGHT on the board-to-board connector can be used to drive a network status indication
LED lamp. The working state of this pin is listed in table;
Table 25: Working state of the NETLIGHT
State
Off
64ms On/ 800ms Off
64ms On/ 3000ms Off
64ms On/ 300ms Off
We provide a reference circuitry for you, shown as the following figure:

3.17 Buzzer

The BUZZER on the board-to-board connector can be used to drive a buzzer to indicate incoming
call. The output volume of buzzer can be set by "AT+CRSL". The reference circuit for buzzer
SIM548C_HD_V1.01
The GSM part of SIM548C function
The GSM part of the module is not running
The GSM part of the module does not find the network
The GSM part of the module find the network
GPRS communication
Figure 31: Reference circuit of NETLIGHT
60
09.05.2008