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SIM800C_Hardware_Design_V1.02 49 2015-4-27
II. Multiplexing Function
Table 43: Multiplexing function
Pin name Reset Pin number Mode 0(default) Mode 1 Mode 2 Mode 3
STATUS I/PD 42 STATUS GPIO19 -
SIM_DET I/PD 14 SIM_DET GPIO20 EINT14
NETLIGHT I/PD 41 NETLIGHT GPIO17 UTXD3
UART1_DTR I/PD 6 UART1_DTR GPIO18 EINT13
UART1_RI I/PD 7 UART1_RI GPIO13 EINT11
UART1_DCD I/PD 5 UART1_DCD GPIO12 URXD3
UART1_CTS I/PD 4 UART1_CTS GPIO14 EINT12
UART1_RTS I/PD 3 UART1_RTS GPIO15
UART1_TXD HO 1 UART1_TXD GPIO11
UART1_RXD I/PD 2 UART1_RXD GPIO10
UART2_TXD HO 22 UART3_TXD GPIO0
UART2_RXD I/PD 23 UART3_RXD GPIO1
Note: Multiplexing function need different software supply.
III. Terms and Abbreviations
Table 44: Terms and abbreviations
Abbreviation Description
ADC Analog-to-Digital Converter
AMR Adaptive Multi-Rate
CS Coding Scheme
CTS Clear to Send
DTE Data Terminal Equipment (typically computer, terminal, printer)
DTR Data Terminal Ready
DTX Discontinuous Transmission
EFR Enhanced Full Rate
EGSM Enhanced GSM
ESD Electrostatic Discharge
ETS European Telecommunication Standard
FR Full Rate
GPRS General Packet Radio Service
GSM Global Standard for Mobile Communications
HR Half Rate
MO Mobile Originated
MS Mobile Station (GSM engine), also referred to as TE
MT Mobile Terminated
PAP Password Authentication Protocol
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