1，此通信必须在Citect服务器上完成,

2，设置计算机设置向导的时候，多处理不能打勾

3，端口和板的设置如下图，无需设置IO设备

4,cicode脚本如下

INT

FUNCTION

My_finger()

INT hPort=-1;

INT len;

STRING TXT = "svend^n";

INT writeerror,readerror;

IF hPort=-1 THEN

hPort = ComOpen("PORT1", 0);

END

SleepMS(200); // give time for port to finish connect

len = StrLength(TXT);

IF hPort<>-1 THEN

writeerror = ComWrite(hPort, TXT, len, 0);

IF writeerror <>0 THEN

Message("","Write failure",0)

ELSE

TXT="";

len=127;

readerror = ComRead(hPort, TXT, len, 0);

IF readerror<>0 THEN

Message("","Read failure",0);

ELSE

Message("read", "#"+TXT+"#", 0);

END

END

END

ComClose(hPort);

RETURN 0

END

效果如下图