Modem 常用AT指令集(14) &Sn - DSR Override DSR控制 &S0 DSR is always active. &S1 DSR acts per V.25. &Tn - Test and DiagnostiCS测试与诊断 &T0 Terminate any test in progress. &T1 Initiate local analog loopback. &T2 Returns ERROR result code. &T3 Initiate local digital loopback. &T4 Allow remote digital loopback. &T5 Disallow remote digital loopback request. &T6 Request an RDL without self-test. &T7 Request an RDL with self-test. &T8 Initiate local analog loop with self-test. &V Display current configurations. 显示当前配置 &Wn - Store Current Configuration 存储当前配置 &W0 Store the active profile in NVRAM profile 0.存储有效参数于NVRAM0区