我GSD文件部分为：PrmText=1
Text(0)="disable"
Text(1)="enable"
EndPrmText

PrmText = 2
Text(0) = "clock up"
Text(1) = "clock down"
EndPrmText

PrmText = 3
Text(1) = "10"
Text(2) = "20"
Text(3) = "30"
Text(4) = "40"
Text(5) = "50"
EndPrmText


ExtUserPrmData=1 "[SlotNumber]"
Unsigned8 0 0-32
EndExtUserPrmData

ExtUserPrmData=2 "Diagnostic Alarm"
Bit(0) 0 0-1
Prm_Text_Ref=1
EndExtUserPrmData

ExtUserPrmData=3 "Process Alarm"
Bit(1) 0 0-1
Prm_Text_Ref=1
EndExtUserPrmData

ExtUserPrmData=4 "Counter mode"
Unsigned8 0 0-1
Prm_Text_Ref=2
EndExtUserPrmData

ExtUserPrmData=5 "Counter timebase (ms)"
Unsigned8 1 1-5
Prm_Text_Ref=3
EndExtUserPrmData

ExtUserPrmData=6 "Counter high-limit"
Unsigned16 65535 0-65535
EndExtUserPrmData

ExtUserPrmData=7 "Counter low-limit"
Unsigned16 0 0-65535
EndExtUserPrmData
Module = "Special module5" 0xc1,0x03,0x03,0x05
6
;Ext_Module_Prm_Data_Len=9
;Ext_User_Prm_Data_Const(0)=0x09,0x01,0x00,0x00,0x01,0xff,0xff,0x00,0x00
;Ext_User_Prm_Data_Ref(1)=1 ;slot number
;Ext_User_Prm_Data_Ref(2)=2 ;diagnostic alarm
;Ext_User_Prm_Data_Ref(2)=3 ;process alarm
;Ext_User_Prm_Data_Ref(3)=4 ;counter mode
;Ext_User_Prm_Data_Ref(4)=5 ;timebase
;Ext_User_Prm_Data_Ref(5)=6 ;high-limit
;Ext_User_Prm_Data_Ref(7)=7 ;low-limit
EndModule
我抓取的报文的用户部分为：09,06,00,00,01，ff,ff,00,00
字节2为什么是06，还有后面的字节是怎么来的？求解