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The E4809-04U-003-B is an OKUMA GDR Board manufactured by Okuma as part of the E4809 CNC Boards series. It accepts 24 V DC, offers TTL-level signals over multiple I/O channels, and supports RS-232/RS-485 communication. Measuring 250 mm × 150 mm × 30 mm and weighing 1.5 kg, it operates from -10 °C to 60 °C with passive PCB heat-sink cooling for reliable industrial performance.
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