by sich » Wed Aug 13, 2014 11:39 am
Sorry that I can't see clearly the connection of your transceiver. Are the UART pins connected correctly?
Eg:
FTDI Tx to RF1 Rx
FTDI Rx to RF1 Tx
Arduino Nano Tx to RF2 Rx
Arduino Rx to RF2 Tx
If you want to enter AT command mode, the best practice would be to power off the module, pull SET pin to low level and wait for at least 1 sec. The module will be in AT mode (you can send AT command now) until the SET pin is released from low level (either left disconnected or pulled to high). After released the SET pin, module will apply the settings requested by you in AT command.