| Specification | AST024RTS/AST024RES/AST024RDS | ASTK028NGD/ASTK028RGD |
|---|---|---|
| Display | 2.4″ 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 | 4-wire industrial resistive touchscreen (Surface hardness: 4H) | ASTK028RGD supports 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 | None | 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 | AST024RTS: TTL serial communication AST024RES: RS232 serial communication AST024RDS: RS485 serial communication | RS485 serial communication |
| Rated Power | 0.5W | 1.5W |
| Voltage Range | DC 5-24V (Reverse polarity protection, polarity-specific power, TTL supports only 5V) | DC 12-24V (Reverse polarity protection, polarity-specific power) |
| Operating Temperature | -10℃~50℃ | -10℃~50℃ |
| Storage Temperature | -30℃~70℃ | -30℃~70℃ |