Simplex 4100-7158 — 4100ES Master Controller CPU card supplied as an Ethernet Connection Upgrade Kit for existing 4100U and 4100+ panels.Simplex lists it in the 4100ES Master Controller upgrade table, the migration path that carries an installed 4100-series cabinet forward to 4100ES electronics without replacing the panel. It suits a site that already has a working operator interface and needs the newer CPU plus an onboard Ethernet port for configuration transfer and service access. New Master Controller CPU card with Ethernet Connection Upgrade Kit Door assembly with user interface is not included For 4100U panels, with or without operator interface Also 4100+ panels, and 4100 (512 point) or 4100+ (1,000 point) panels previously upgraded to a 4100U Master Controller Listed in Simplex datasheet S4100-1031 as a 4100ES panel accessory Check the siblings first. 4100-7150 adds a 4100ES door with 2 x 40 LCD operator interface for a 1,000 point 4100+; 4100-7162 and 4100-7164 add a colour ES Touch Screen Display door and need 4100ES Version 6.01 or later; 4100-7163 is the door alone.