PCB设计规则总表，可借助该规程指导PCB设计，提高PCB稳定性和布局布线的美观性-Master Schedule of PCB design rules, can make use of a point of order to guide the PCB design, PCB improve stability and aesthetics of the placement and routing

IEC62056绿皮书，包括通信协议、通信规程等内容。This fifth edition of the "Green Book" includes the specification of the communication protocol layers based on:- IEC 62056-42, Electricity metering- Data exchange for meter reading, tariff and load control- Part 42:

MODBUS协议中文版(高清版) 串行链路和TCP/IP 上的MODBUS标准介绍 该标准包括两个通信规程中使用的MODBUS 应用层协议和服务规范： ·串行链路上的MODBUS MODBUS串行链路取决于TIA/EIA标准：232-F和485-A。 ·TCP/IP上的MODBUS MODBUS TCP/IP取决于IETF标准：RFC793 和RFC791有关。-MODBUS protocol Chinese Version (HD version) serial lin

DTMF制式主叫号码显示规范，本规程适用于能够接收和显示交换机以 DTMF 方式传送的主叫号码的电话机或附加装 置-Caller ID display DTMF standard specification, the rules apply to telephone or additional devices can receive and display switches to DTMF mode of transmission of Caller ID