WT-VCS11视频字符叠加模块与单元控制器一起放置，监测室内机监视按键确定是否叠加字符，监测短消息命令以便接收短消息。短消息在室内机屏幕底部2行循环显示。-Video character overlay module is placed together with the cell controller to monitor the indoor unit to monitor key to determine whether the character overlay, monitor co