A413295 AIR8C NTP 通常通过以太网实现
A413295 AIR8C NTP 通常通过以太网实现
对于您要问的内容,解释可能有点多,也可能太少了——但它确实讨论了数据包和健全性检查等问题,因此这可能就是您要找的内容。NTP 通常通过以太网实现,使用 UDP/IP(您也可以使用您喜欢的 Internet 搜索引擎进行查找)。但基本上,消息被发送(在这种情况下,从“客户端”到“服务器”询问当前时间,“服务器”发回一条消息,其中包含几位信息,“客户端”可以从中确定多长时间请求到达那里所花费的时间、处理请求所花费的时间、请求被发回的时间等等。
One specific case: a DCS system (installed >12 years ago) with PC run in Linux an not supported NTP. They have master clock system which receive time signal from GPS. But the way the deliver synchonization information to node in the system (controllers, PCs) are is 1-sec and 5-sec pulses via mechanical relay. Thus, I don't understand how it can send time message to these node. If it sends only the synchonization pulse, it can keep the time offset to be constant, but can not make this offset become zero. Am I right?
3BDZ000398R1
5SGX10H6004
PU516A
3BSE032402R1
5SHX14H4502
3BHB003023P201
5SHX10H6004
PPE091A101
3BHE044481R0101
3BHE044477P3
VA-3180-10
216EA62
REX010
XO08R1-B4.0
VA-MC15-05
3BSE0002540R1
72395-4-0399123
EL3040
0240289352/1100
IEPAS02
83SR04C-E
GJR2390200R1411
GJR2390211R45
83SR06B-E
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