电源面板 PP220 5.7" QVGA 单色液晶显示器，带触摸屏（电阻式）；1 个 aPCI 插槽；64 MB SDRAM；256 kB SRAM；紧凑型闪存插槽（I 型）；ETH 10/100；RS 232；2xUSB；电池；金属外壳，IP 65 防护等级（正面）；24 VDC
| 类型 | 单色液晶屏 |
| 对角线 | 5.7 英寸（144 毫米） |
| 颜色 | 8种灰色 |
| 解决 | QVGA，320 x 240 像素 |
| 对比 | 25:1 |
| 视角 | |
| 水平的 | 方向 R / 方向 L = 40° |
| 垂直的 | U 方向 = 40°/ D 方向 = 50° |
| 背光 | |
| 亮度 | 140 坎德拉/平方米 |
| 半亮时间 | 50,000 小时 |
| 过滤玻璃 | |
| 透射率 | - |
| 抗反射涂层 | - |
| 触摸屏 | |
| 类型 | 郡泽 |
| 技术 | 模拟，电阻（Gunze） |
| 控制器 | 汉普郡，串行，12 位 |
| 透射率 | 84% |
| COM1 | |
| 类型 | RS232，调制解调器功能，非电气隔离 |
| 变体 | 9 针 DSUB 插头 |
| UART | 16550 兼容，16 字节 FIFO |
| 限度。波特率 | 115 千比特/秒 |
| CompactFlash 插槽 1 | |
| 类型 | 第一类 |
| USB | |
| 数量 | 2 |
| 类型 | USB 1.1 |
| 变体 | A型 |
| 传输率 | 低速 (1.5 Mbit/s)，全速 (12 Mbit/s) |
| 载流能力 | 限度。每个连接 500mA |
| 以太网 | |
| 数量 | 1 |
| 控制器 | 麦菲特 DP83816 |
| 传输率 | 10/100 兆比特/秒 |
| 限度。波特率 | 100 兆比特/秒 |
Device drivers can register /sys hooks or entries; a specially registered callback function from the device driver gets executed when they are read or written. These callback functions—running in supervisor mode—may accept parameters, initiate bus transfers, invoke some processing, modify device-specific variables, and return integer values or character strings back to the user. This allows additional functionality; for example, the temperature sensor or auxiliary ADCs on the AD7877 touch-screen digitizer can be made available to user space.
Device drivers can be statically built into the kernel, or dynamically installed later as loadable modules. Linux kernel modules (LKMs) are dynamic components that can be inserted and removed at run time. This is especially valuable to driver developers since time is saved by quicker compilation and by not having to reboot the system to test the module. By letting the hardware drivers reside in modules that can be loaded into the kernel at any time, it is possible to save RAM when the specific hardware is not in use.
