打开串口调试助手接收区一直显示:
$PGLOR,VER,17.9.931.0,,*1D
$PGLOR,VER,17.9.931.0,,*1D
$PGLOR,VER,17.9.931.0,,*1D
$PGLOR,VER,17.9.931.0,,*1D
$PGLOR,VER,17.9.931.0,,*1D
$PGLOR,VER,17.9.931.0,,*1D
$PGLOR,VER,17.9.931.0,,*1D
$PGLOR,VER,17.9.931.0,,*1D
发送AT指令,也没有返回,为什么?问题出在哪?求助