this is the wire need to make DTR ready for CW. The firmware should be ready by tomorrow and I will give also the instruction to activate.
After removed the cover you should take out the loudspeaker plate, then you should be able to make the wire as made in figure.
The wire connect TP20 to R90 (DTR). Please make the modification with FDM-DUO power off, and take care do not make that modification will be well done without any shortcircuit with other components pins or pcb trace.
打开机壳，在PCB上找到TP20的测试点连接到R90的那个地方，就是DTR，记得关机操作哦。
You must install all the 3 firmware before operate then you must enable the option with the one time following operation:
1- Turn ON FDM-DUO while pressing the Tune Knob until the display show ‘-waiting-’
按住调节按钮开机，直到出现 -waiting-
2- you will be able now to see MENU 95, then set value = 1 and save.
找到95号菜单，把它设置为1，保存
Once you have done this procedure you will be able to choose on MENU 37 the option KEY+DTR as CW-IN
Remember:
1 that KEY+DTR is volatile and must be set each time you turn on FDM-DUO, this to prevent that FDM-DUO go in transmission depending on status of PC connected.
如果使用KEY+DTR功能，你必须打开它，也就是N1MM的拍发功能。
2 you will be able to set KEY+DTR on menu 37 only if CAT cable is connected and DTR is not active;
找到37号菜单，改成KEY+DTR。
