
TTL在ping命令中代表什么? - 知乎
TTL(Time-to-Live)实际上是一个8比特的字段,在每个IP数据包的头部信息中都有这个字段。 TTL的主要作用是防止数据包在网络中无限制地传输或循环。
How does TTL serial work? - Electrical Engineering Stack Exchange
Point of terminology: "TTL serial" is a severely over-broad term, " (point-to-point) asynchronous serial (at TTL levels)" seems to be what you're asking about. (Though that's still probably …
问一下大家什么是USB转TTL? - 知乎
Aug 15, 2020 · USB转TTL是一种 串口通信 转换器,它可以将USB接口转换为TTL串口通信接口。 TTL串口通信是一种常见的数字通信方式,常用于单片机、传感器等设备之间的数据传输。 通 …
uart、串口、COM口、USB口,ttl,rs232,rs485这几个到底是啥关 …
1. TTL电平 TTL指双极型三极管逻辑电路(transistor transistor logic),这种信号0对应0V,1对应3.3V或5V,与单片机、MCU、SOC的IO电平兼容。 不过实际也不一定是TTL电平,因为现在 …
当TTL等于1时经过的最大路由个数为0,当TTL等于255时,能经过 …
因为每经过一个路由器路由器会将ttl减1后发给下一跳,当ttl等于0路由器会丢弃该IP包。 所以ttl等于1时,路由器收到该包,减1,为0丢弃。
digital logic - What is meant by TTL in this context? - Electrical ...
Jun 22, 2023 · TTL requires that logic 1 input must be at least 2V, and TTL drivers are designed to guarantee that. That is far short of what this driver requires to register as logic 1.
USART, UART, RS232, USB, SPI, I2C, TTL, etc. what are all of these …
Aug 14, 2012 · TTL mean Transistor-Transistor-Logic and has its level for logical zero near 0V and for logical one near 5V. Often any 5V logic is called TTL, although most circuits nowadays …
域名解析中的 TTL 是什么? 它设置的时间长短对网站有什么影响?
TTL是 递归DNS 缓存域名解析的时间,以秒为单位。 过期了递归DNS就会去找 权威DNS 重新查询。 ( 什么是TTL值? ) 如果你的域名解析改动较频繁,比如使用 动态IP 等,就应该把TTL …
TTL to RS485 using MAX485 - Capacitor voltage requests
Feb 18, 2023 · I need to implement a TTL to RS485 converter into an home made project and searching by Google I found this module with related schematics: Could you help me by …
带你一分钟了解编码器基础知识 - 知乎
Mar 8, 2024 · 此外,增量编码器的信号输出电平标准也是多样的,常见的有TTL、HTL、PNP和NPN等。 TTL和HTL是常见的电平标准,其中TTL为长线差分驱动,而HTL也称为推拉式或推 …