12 CONFORMITY WITH PREVIOUS VERSIONS Uniphones should be cleaned with a damp cloth or using the means for cleaningplastics. It is forbidden to use solvents. In case the monitor gets dirty it should be cleaned with a soft and damp cloth.It is recommended to do it with power cut off. No abrasive materials which might scratch the casing surface can be used. Nobenzene, solvents or strong detergents can be used because they might causedamage or discolouring of the surface.12 Conformity with previous versions12.1 Electronic cassetteElectronic cassettes EC-2502 can be used as replacements of electronic cassettesEC-2200, EC-2200/U, EC-2200H, EC-2500/S, EC-2500/U, EC-2500/H, EC-2501/Uand EC-2501H.Electronic cassettes will co-operate with all previous versions of external panels forthe mentioned systems. If a three position display is installed in a panel, in elec-tronic cassette settings an operation of three position display should be activated(procedure P2, parameter 3C).12.2 External panelExternal panels CP-2501xx, CP-2511xx, CP-2521xx can be used instead of panelsCP-2500xx with the exception of panels equipped with electronic key readers. Inprevious versions of entry phones the panels were equipped with separate controllers.In system CD-2502 this function is taken over by electronic cassette so externalpanels have also been changed. However, there is a possibility of using the controllerfrom the old electronic cassette and connecting it to the reader in the new panel.Using these panels requires modification of electronic cassette. Detailed informationon this subject is available in Laskomex service.NOTE!Correct work of RFID function in CP-25xxR panel ensure cooperation onlywith EC-2502R electronic cassette.12.3 Other entry phone systemsSystems CD-2501 and CD-2502 can cooperate with system CD-3100. This refersto situation when a few buildings should be enclosed with a fence in which therewill be more than one entrance. In such case at the main entrance an entry phoneCD-3100 should be installed (set consisted of EC-3100, CP-3100 and supplier).Subordinate entrances should be connected in such a way as if entry phone CD-2502(line L+, L-) was installed at the main entrance. If CD-3100 is connected withCD-2501 mode with building numbering will not operate. In multi-entrance47