52Getting started Part namesand functions Connections Control functionSetting Defaults File and foldersettings Playback InformationSerial remote control functionD&M RC Communication formatn Configuration of control commandsThe packets of control commands start with the Start Character “@”,and end with the End Character “0x0D” as shown below.COMMANDID0StartCharacterEndCharacter\r (0x0D)@n Configuration of command codesItem Value (Hex value within parentheses)Start Character ‘@’ (0x40)ID ‘0’ (0x30)Command Indicates the command details.End Character ‘¥r’ (0x0D)Response timeout is 100msec.n ACK (received successfully) and NACK (receivefailed) command codesContent Hexvalue Transmission conditionsACK 0x06 –NACK 0x15 • When an End Character (0x0D) is receivedwith no Start Character “@”• When a command that does not exist isreceived• When there is a space more than 5msecbetween command characters• When a command is received, ACK or NACK is returned within 100msec.• If there is no response after 100 msec, the next command ispermitted.q External control and operation of the DN-700CWhen the DN-700C receives a control command from the host, theDN-700C sends ACK (received successfully) to the host and executesthe command.Control commandHost deviceHowever, if data other than a specified command or an End Character(0x0D) with no Start Character ‘@’ is received, receive fails and NACKis returned.w Status information output for external statusrequest commandsWhen a status request is received from the host, the DN-700C returnsACK and a response to the request details.Status requestcommandSequence diagram of status request commandStatus informationcommandHost deviceHowever, if data other than a specified command or an End Character(0x0D) with no Start Character (‘@’) is received, receive fails and NACKis returned.