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View and Download Gefran GFX4 installation and operation manual online. 4 ZONE MODULAR POWER CONTROLLER. GFX4 Controller pdf manualView & download of more than 62 Gefran PDF user manuals, service manuals, operating guides. Controller user manuals, operating guides & specifications. (local/remote manual/automatic commutation, internal timer control, direct control of outputs). Protocols available: MODBUS RTU and. CENCAL (Gefran). Current Loop or RS485 with GEFRAN. (Cencal) . Manual reset (correction of the offset after setting): Apply users' manual warnings for a correct installation. You can select one of the two presettable setpoints, select Manual-Automatic mode, reset the alarm memory, or enable the hold function by means of the digital