WP7607-1 KSLEEP doesnt work


I 'm using WP6707-1 module and I try to put it in sleep mode according to following sequence :

1.Send “AT+RIOWNER=0”
2. Send “AT+KSLEEP=0”
3. Set UART1_DTR to 1 ( inactive)
4. Send “AT”
=> Module responds with OK, that mean module is in not in sleep mode !

My Question is,

  • My sleep sequence is correct?