Smart Machine Smart Decision
SIM800H&SIM800L_Hardware Design_V2.02 27
2015-07-27
is set to minimum functionality by “AT+CFUN=0”, the RF function and SIM card function will be disabled. In
this case, the serial port is still accessible, but all AT commands correlative to RF
function and SIM card
function will not be accessible.
For detailed information about AT command “AT+CFUN=
“, please refer to document [1].
4.3.2. Sleep Mode 1 (AT+CSCLK=1)
Customer can control SIM800H&SIM800L module to enter or exit the sleep mode (AT+CSCLK=1) by DTR
signal. When DTR is in high level and without interrupt (on air and hardware such as GPIO interrupt or data in
serial port), SIM800H&SIM800L will enter sleep mode automatically. In this mode, SIM800H&SIM800L can
still receive paging or SMS from network but the serial port is not accessible.
