ELAN DT22-240

AMB

Good day!
Share your experiences, FM tuner device ELAN DT-22, to make the management and exchange of data on the RS-232 interface.
Protocol switching presets:
send_string RS_port, "'& DT, R2, TUNE,?'
Response should be:
* DT, R1, TUNE, 10010 <cr>
but come the next line
Line 195 (13:27:14) :: String To [5001:7:1] - [& DT, R1, TUNE,? $ 0D]
Line 196 (13:27:14) :: String From [5001:7:1] - [$ B6 $ D7 $ D5 $ DA $ D5v $ BBU $ 8D $ D5 $ 9D $ 81 $ E5 $ 00]
But if you send a row or two rows
send_string RS_port, "'& DT, R2, TUNE,?', 13,13,13,13" is beginning to come
Line 17 (19:15:18):: String From [5001:7:1]-[$B6$D7$D5$DA$B5v$BBU$8D$D5$9D$81$E5$00,TUHD$!$10$05"@*DT,CH,ACK$0D*DT,R2,TUNE,10620$0D*DT,CH,ACK]

Tried to change the settings, the transmission rate does not help.
Management is working correctly.
In what may be the Problem?
Thank you.