* a trigger value set in 'triggerstring' are NULL, the other entries
* contain the respective trigger type which is requested for the
* respective channel (e.g. "r", "c", and so on).
* a trigger value set in 'triggerstring' are NULL, the other entries
* contain the respective trigger type which is requested for the
* respective channel (e.g. "r", "c", and so on).