@@ -51,46 +51,17 @@ def CTR(self):
5151 self .field ["CTR" ] = ctr0
5252 leftframe = leftframectr [2 :]
5353 return returnctr ,leftframe
54- else :#有扩展控制码
54+ else :#==0有扩展控制码
5555 i = 1
5656 chars = ctr0
5757 while int (ctr0 ,16 )& 0x80 == 0 :#循环判断默认ctr之后的扩展字节是否可扩展
58- ctr = leftframectr [2 * i :2 * i + 2 ]
59- chars += ctr ##字符串拼接
58+ ctr0 = leftframectr [2 * i :2 * i + 2 ]#此ctr0并不是指字符串开头
59+ chars += ctr0 ##字符串拼接
6060 i += 1
61+
6162 self .field ["CTR" ] = chars #讲扩展的CTR(ctr0,ctr1,...)构成的字符串追加进入域的全局变量中
6263 leftframe = leftframectr [2 * i :]#捕获去掉ctr0,ctr1,...剩余的字符串
63- ##提取出ctr1内容部分
64- ctr1 = self .field ["CTR" ][2 :4 ]
65- num = int (ctr1 ,16 )
66- if num == 0x07 :#代表寻址方式是广播，长度为0字节
67- self .field ["ADDR" ] = leftframe #直接返回原字符串
68-
69- elif num == 0x06 :##代表寻址方式是LA，长度为1
70- self .field ["ADDR" ] = leftframe [:2 ]
71-
72- elif num == 0x05 :##代表寻址方式是ID，长度为12
73- self .field ["ADDR" ] = leftframe [:24 ]
74-
75- elif num == 0x04 :##代表寻址方式是UC，长度为5字节
76- n = 2 ##这个不对2<=n<=8
77- self .field ["ADDR" ] = leftframe [:10 ]
78-
79- elif num == 0x03 :#长度2字节
80- self .field ["ADDR" ] = leftframe [:4 ]
81-
82- elif num == 0x02 :#长度为4字节
83- self .field ["ADDR" ] = leftframe [:8 ]
84-
85- elif num == 0x01 :#长度为6字节
86- self .field ["ADDR" ] = leftframe [:12 ]
87-
88- elif num == 0x00 :#8字节
89- self .field ["ADDR" ] = leftframe [:16 ]
90-
91- else :#0字节
92- self .field ["ADDR" ] = leftframe
93- # return returnctr,self.leftframe[2*i:]#返回ctr第一个字节（便于获得首字节的每一位的信息）、后续长度的剩余字符串
64+ return returnctr ,leftframe #返回ctr第一个字节（便于获得首字节的每一位的信息）、后续长度的剩余字符串
9465
9566 def MAM (self ):#MAM域占一个字节
9667 '''E7 10231195711100600800100009190069711100600850120115B8C0FF4FB1'''
@@ -106,13 +77,46 @@ def MAM(self):#MAM域占一个字节
10677 self .field ["MAM" ] = leftframemam [:2 ]#MAM占一个字节
10778 return leftframemam [2 :]#返回去掉多级地址的的字符串
10879
109- def ADDR (self ):#addr是由CTR1控制的，也就是说当存在CTR1时，ADDR也就存在,ADDR的具体形式由见表2-4寻址方式定义
80+ def ADDR (self ):#addr是由CTR的b0-b2比特位控制的，当存在CTR1时，CTR1的b2-b0比特位表示的主站寻址方式，只存在ctr0时，b2-b0比特位表示从站的寻址方式，主从的寻址方式都是一样的
11081 leftframeaddr = self .MAM ()##获取MAM()处理后的字符串
82+ ##提取出ctr1内容部分
83+ ctr0 = self .field ["CTR" ][:2 ]
84+ if int (ctr0 ,16 )& 0x80 == 0 :
85+ ctr1 = self .field ["CTR" ][2 :4 ]
86+ num1 = int (ctr1 ,16 )
87+ num = int (ctr0 ,16 )
11188
112-
89+ if num is 0x07 :#代表寻址方式是广播，长度为0字节
90+ self .field ["ADDR" ] = "" #直接返回原字符串
91+ return leftframeaddr
92+ elif num == 0x06 :##代表寻址方式是LA，长度为1
93+ self .field ["ADDR" ] = leftframeaddr [:2 ]
94+ return leftframeaddr [2 :]
95+ elif num == 0x05 :##代表寻址方式是ID，长度为12
96+ self .field ["ADDR" ] = leftframeaddr [:24 ]
97+ return leftframeaddr [24 :]
98+ elif num == 0x04 :##代表寻址方式是UC，长度为5字节
99+ self .field ["ADDR" ] = leftframeaddr [:10 ]
100+ return leftframeaddr [10 :]
101+ elif num == 0x03 :#长度2字节
102+ self .field ["ADDR" ] = leftframeaddr [:4 ]
103+ return leftframeaddr [4 :]
104+ elif num == 0x02 :#长度为4字节
105+ self .field ["ADDR" ] = leftframeaddr [:8 ]
106+ return leftframeaddr [8 :]
107+ elif num == 0x01 :#长度为6字节
108+ self .field ["ADDR" ] = leftframeaddr [:12 ]
109+ return leftframeaddr [12 :]
110+ elif num == 0x00 :#8字节
111+ self .field ["ADDR" ] = leftframeaddr [:16 ]
112+ return leftframeaddr [16 :]
113+ else :#0字节
114+ return leftframeaddr
113115
114116 def SER (self ):#长度为1个字节
115- pass
117+ leftframeser = self .ADDR ()
118+ self .field ["SER" ] = leftframeser [:2 ]
119+ return leftframeser [2 :]
116120
117121 def DI (self ):##
118122 pass
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