WEBVTT

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Choose EDT EVK043027B I/O Memory - Brightness. Press Use Example.

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Name the project My Brightness Panel, choose its folder, then Create.

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Asset > Text > Texts: update title, hint, caption and cmds. Click outside to commit.

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Button_1: Reset 100%. Set X 280, Y 224, Width 112, Height 32.

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Bindings: enable communication; Brightness tag, Value property, Write Widget Value.

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Protocol > I/O Memory: Brightness is enabled, range 10-100%, command BRIGHT.

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Clicked > Built-in Action > Set Property: BrightnessSlider, Value, 100. Save.

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Preview > Start. Move the slider to 40: the readout and simulated brightness follow.

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Press Reset 100%. Confirm the value returns to 100, then stop Preview and save.

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Ask for the teal 24 px title and sun icon while preserving behavior. Review Keep / Undo run.

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Follow Problems. Increase Button_1 Height to 40; keep Y at 224. Retest the reset action.

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Build for the HMI, then Programming & Restart via the programmer selected in Deploy.

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Use the protocol USB-C COM port: 115200, 8N1, no flow control. It is separate from deployment.

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SET BRIGHT 40 returns OK. GET BRIGHT returns BRIGHT=40. Include CR LF.

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SET BRIGHT 5 returns ERR; read-back stays 40. Restore 100 and read it back.

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Flash the Modbus brightness example. In mbclient, set the protocol port to RTU, 115200 8N1.

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Send Message > Port/Unit: unit 1, FC03, address 4x 1, count 1. Send One reads 100.

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FC06, address 4x 1, Value 40. The echoed response and Good status confirm the write.

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Switch back to FC03: the connected EVK returns 40. Compare the physical display too.

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FC06 with Value 5 returns exception 03: BadIllegalDataValue.

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FC03 still reads 40. The rejected write did not change the previous valid value.

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Write 100, read 100, close Send Message and Stop main polling to release the COM port.

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EVK043027B at 40. Left: actual Modbus read-back. Right: supplied photo, AI glare removal.