User Manual

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Smart Machine Smart Decision

SIM800L-EVB_User Guide_V1.00 9 2013-07-22

4 SPK1N O Negative receiver output

3.3 SIM card interface

Figure 6: SIM card interface

3.4 RS232 Interface

Figure 7: Serial Ports

Serial Port 1——MAIN Interface

Serial Port 2——DEGUG Interface

Main Interface:

Pin Signal I/O Description

1 DCD O Data carrier detection