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There is a MPEC howto. Entering target is very similar, just instead of MPEC one-line you put in target name (resolvable by SIMBAD):
rts2-newtarget 5004 M74 01:37:14-04:06:18
rts2-imgproc actually have three output scenarios for the images:
%li %lf %lf (%lf,%lf)
for the scanf. The format is defined in src/plan/connimgprocess.cpp. First is image ID - and integer. Second and third are RA and DEC of image centre expressed in degrees (RA 0..360.0, DEC -90..90). In brackets are errors in RA and DEC, again in degrees. Assuming your image centre is at RA DEC 12:00:00 05:00:00 and the telescope pointed to 12:01:00 05:01:00, the output string should be:
1 180.0 5.0 (.2499999990 .0166666666)
Selector (rts2-selector) is process responsible for selecting new observational targets. It sends targets IDs using next command. You can imitate selector behavior by running rts2-mon, selecting EXEC component and typing: next 1000 to select target with id 1000. The selection is executed on the following occasions: