RS485 – ttyS1 最高波特率ttyS1, maximum baud rate 115200bps RS232 RS232 – ttyS3最高波特率 115200bps 可以使用我们配套的uart 脚本进行测试 , maximum baud rate 115200bps Test with the supporting UART script. Max load: 1A. Wire length shall not exceed 1M.12V 电源输出,最大负载为1A,引线长度不应超过1M GPIO-IN 输入低电平或者悬空时,CPU读取为“1”; 输入高电平时(Low level or floating: CPU reads "1". High level (3.3-12V),): CPU 读取为“reads "0”". GPIO IN1: echo 338 > /sys/class/gpio/export echo in > /sys/class/gpio/gpio338/direction cat /sys/class/gpio/gpio338/value GPIO IN2: echo 339 > /sys/class/gpio/export echo in > /sys/class/gpio/gpio339/direction cat /sys/class/gpio/gpio339/value GPIO-OUT CPU 输出“1”时,端口输出为“outputs "1": port outputs 3.3V”; CPU输出“0”时,端口输出为 “0V” GPIO输出是带3.3V@10K上拉的漏极输出器, . CPU outputs "0": port outputs 0V. GPIO output is open-drain with 3.3V@10K pull-up. It can control 5V-12V devices (external pull-up required).可以控制 5V-12V的设备。(需要外接上拉) GPIO OUT1: echo 335 > /sys/class/gpio/export echo out > /sys/class/gpio/gpio335/direction echo 0 > /sys/class/gpio/gpio335/value echo 1 > /sys/class/gpio/gpio335/value GPIO OUT2 : echo 334 > /sys/class/gpio/export echo out > /sys/class/gpio/gpio334/direction echo 0 > /sys/class/gpio/gpio334/value echo 1 > /sys/class/gpio/gpio334/value |