51怎么样接收串口数据做出判断？

好汉林

+IPD,51:f=a&d=1287369807&n=whxwhx&com=open&from=server->sb +IPD,52:f=a&d=1287369807&n=whxwhx&com=close&from=server->sb +IPD,48:f=a&d=1287369807&n=whxwhx&com=W&from=server->sb +IPD,48:f=a&d=1287369807&n=whxwhx&com=S&from=server->sb 我想用单片机串口接收这几个数据然后做出判断，可是一直不成功，谁能帮我看看怎么样写程序才能才能接收设个程序做出判断，红色是我要判断得数据，谢谢了。