the elsa synergy 2000 issues analog signals in accordance with the requirements of directive rs-170. the synchronization information is sent separately. if your monitor supports the switching of input impedance, the '75 ohm' setting (= '75ω') should be chosen for the r, g and b video inputs and the '2 kohm' setting (= '2kω') should be set for the sync inputs. you should not try other switch settings at the sync inputs unless your monitor expects a sync level that differs from that of most common monitors and does not produce a stabile image. in some cases, the switch settings are labeled only with 'low' and 'high'. if this is the case, either you can look up the ohm values for the switch settings in the user manual provided with your monitor or you can try both settings to see which one produces a stabile image in all of the graphic display modes you require.