How to persist motor control command without a loop?

I'm using SDC2160 with firmware 1.8d. In Open loop mode, the command used to control the motor setcommand(_G, 1, 250) makes the motors run continuously only when the command is continuously given in a loop. Is it possible like when a command is given just once, the motor keeps running with that speed. For example, in Arduino programming, while interfacing a motor driver, the command that is used to given signal to a channel looks like: servo.write(180). This if executed once, will make the motor keep running in the forward direction at the max speed (180). Is it possible in Microbasic with SDC2160?

As far as I know _G persists unless either (1) a new _G arrives, or (2) the serial watchdog times out. Perhaps it is (2) that you are seeing? If so, you can turn off the watchdog (but do think about safety issues) or use a timer to repeat the _G at a bit less than the watchdog interval (that's needs a loop to see timer state, but it is a very "lightweight" loop).

On the other hand, perhaps I've misunderstood your question.

Yes I have understood now. Seems it was the watchdog. I will look into it. Thank you very much