GMDSS: Element 3

1. A Accept data input into R-S inputs with CLK initiated.
2. B Accept data input into PRE and CLR inputs without CLK being initiated.
3. C Refuse to accept synchronous data if asynchronous data is being input at same time.
4. D Operate in toggle mode with R-S inputs held constant and CLK initiated.

Tip: press A-D to answer