Answer: You can use the DCD pin to indicate if the module is in data mode (You should set AT&C1 and AT&W before)
DCD ON => in data mode,
DCD OFF => in command mode
Answer: You can use the DCD pin to indicate if the module is in data mode (You should set AT&C1 and AT&W before)
DCD ON => in data mode,
DCD OFF => in command mode