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Word = hex(....)
   Sd = ENQ + "00FFWW5D" + 0123 + "02" + Word
   frmMain.Rscom.Output = Sd
   Twrite = 1
   Timer1.Interval = 80
   Timer1.Enabled = True
Delay: DoEvents
   If Twrite = 1 Then GoTo Delay
   Timer1.Enabled = False
   RD = frmMain.Rscom.Input
   If Left(RD, 5) = ACK + "00FF" Then exit sub

.........
SD = ENQ + "00FFWR3D0120" + "02"
  Moncom.Output = SD
  Tread = 1
  Timer2.Interval = 100
  Timer2.Enabled = True
Delay4: DoEvents
  If Tread = 1 Then GoTo Delay4
  Timer2.Enabled = False
  RDD = Moncom.Input
  If Left(RDD, 5) = STX + "00FF" Then EXIT SUB
誰能幫忙解釋下啊   ？？？？


ENQ + "00FFWW5D"

ENQ + "00FFWW5D" 就是合并字符串

1. “ENQ”是一個通訊使能字符 （十六進制：05），即請求（開始）通訊。
2.   ENQ + "00FFWW5D"  實際含義是“05 00 FF WW 5D”，這種格式通常在三菱變頻器RS485通訊中用的比較多。

看下三菱通訊手冊

是的3樓說的對，手冊上都有的