Home / Standards / GB/T 42756.4-2023 GB/T 42756.4-2023 Active Cards and security devices for personal identification—Contactless proximity objects—Part 4:Transmission protocol 卡及身份识别安全设备 无触点接近式对象 第4部分：传输协议 Standard Type GBT ICS 35.240.15 CCS L70 Status 现行 Issue Date 2023-05-23 Implementation 2023-12-01 Responsible Dept 国家标准委 Drafting Unit N/A