| Specification | ASTK028NGD | ASTK028RGD |
|---|---|---|
| Display | 2.8″ TFT LCD | 2.8″ TFT LCD |
| Color | 65535 colors | 65535 colors |
| Resolution (Px) | 320 x 240 | 320 x 240 |
| Brightness | 250 cd/m² | 250 cd/m² |
| Backlight | LED | LED |
| LED Lifetime | 20,000 hours | 20,000 hours |
| Touchscreen | None | 4-wire industrial resistive touchscreen (Surface hardness: 4H) |
| CPU | 96MHz M0 | 96MHz M0 |
| Memory | 16Mbyte SPI NOR Flash | 16Mbyte SPI NOR Flash |
| RTC (Real-time Clock) | Built-in | Built-in |
| Buzzer | Yes | Yes |
| Power-off Data Retention | Not supported | Not supported |
| USB Port | None | None |
| Program Download Method | SD Card Download | SD Card Download |
| USB Drive | Not supported | Not supported |
| Communication Port | RS485 serial communication | RS485 serial communication |
| Rated Power | 1.5W | 1.5W |
| Voltage Range | DC 12-24V (Reverse polarity protection, polarity-specific power) | DC 12-24V (Reverse polarity protection, polarity-specific power) |
| Operating Temperature | -10℃~50℃ | -10℃~50℃ |
| Storage Temperature | -30℃~70℃ | -30℃~70℃ |