Dear All,\n\n“In order to establish remote control communication, the external controller must send [devstatus runmode] command to the device and await response. When the device responds as [OK devstatus runmode "normal"], the device is ready to receive commands.” (In MTX3, MTX5-D, MRX7-D, XMV Series, EXi8, EXo8 Remote Control Protocol Specifications V3.3.1 on the website tw.yamaha.com\/files\/download\/other_assets\/9\/1258239\/190118_mtx_mrx_xmv_ex_rcps_v331_rev13_en.pdf)\n\nI have tried to control MTX3 by using RS232 protocol. However, I found out that I cannot receive any response from MTX3. I have already sent “devstatus runmode LF” (without quotation and sent in ascii) to the MTX3, but it did not reply “OK devstatus runmode “normal”” (without outside quotation and sent in ascii) like the description in RS232 protocol manual.\n\nCould you please help me to figure out what’s wrong with my communication process? Thank you very much for your help!