Smart serial screen FAQ: software

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This section covers software issues on smart serial screens: JPG background images causing corruption (image over 32 KB, resolution mismatch or wrong mode configuration; set image size, resolution and display mode correctly); enabling the CFG checksum (0x20 with 0x5A5 marks the frame-format config valid, 0x21/0x22 with 0x5AA5 sets the frame header, 0x23 with 0x5A enables CRC); T5D2 decimal garbling (screens display hexadecimal data); buzzer command (5A A5 05 82 00A0 007D); backlight on/off and brightness via 0x82 (range 00-64, 100 levels); rotating T5L portrait projects 90 degrees (generate ICL and modify CFG); E-series text updates without overlap (use a solid background color area to skip the cut-and-refresh command).