Twig bluethoot dont responce "OK"

hello (sorry for my English)
configure the module to achieve and I can send messages from my pc arduino but the problem is that I can not send messages to the module from my pc.
I followed the wiki guide to the twig I sent the letter “a” from SScom3.2 but the module does not respond.
I think there is a problem with RX module because I could not get the message “OK” after sending commands to the module.
finally wanted to know if after getting the connection is necessary to send messages including “\ r \ n \ r \ n”, to send data to command module should not write “\ r \ n data \ r \ n” (this with SScom3.2)


Sorry for inconvenience bought. You can reference here.Hope you can find the answer.