FTDI to HM-10(CC2541) serial command no response
Ahhh...After few hours of struggling finally found the solution. The "HM-10" module I was using was a copycat module and "Both NL &amp;CR" option should be chosen as a newline/carriage return character will be feed at end of the AT command. I found the solution from these two awesome articles: 

Working with cheap bluetooth BTLE4 devices HM-10 BLE-CC41A

Comparing the HM10 and BLE CC41a Bluetooth 

Hope this will be helpful for someone meet this problem in the future.