diff --git a/sl2-100/pd.py b/sl2-100/pd.py
index 94d6c6a..cb48b62 100644
--- a/sl2-100/pd.py
+++ b/sl2-100/pd.py
@@ -125,14 +125,19 @@ class Decoder(srd.Decoder):
         self.put(ss, es, self.out_ann,[1, [str(bit)]])
         #下面处理每个字段
         if self.state == 'HEADER':
-            self.header_str += str(bit)
-            self.head_cnt = self.head_cnt+1
-            if self.head_cnt == 6:
-                self.put(self.header_first, es, self.out_ann,[2, ['HEADER_x:' + self.header_str]])
-                self.state = 'xpos'
-                self.xpos_first = es
-                self.xpos_cnt = 0    #当前坐标 位数归零,准备累积
-                self.data = 0        #当前坐标值归零,准备开始累积
+            if(self.head_cnt == 0 and bit == 0):# 如果是第一个数据位且为0,则认为是y坐标数据                   
+                self.header2_str += str(bit)
+                self.head2_cnt = self.head2_cnt+1
+                self.state = 'HEADER3'
+            else:
+                self.header_str += str(bit)
+                self.head_cnt = self.head_cnt+1
+                if self.head_cnt == 6:
+                    self.put(self.header_first, es, self.out_ann,[2, ['HEADER_x:' + self.header_str]])
+                    self.state = 'xpos'
+                    self.xpos_first = es
+                    self.xpos_cnt = 0    #当前坐标 位数归零,准备累积
+                    self.data = 0        #当前坐标值归零,准备开始累积
         elif self.state == 'xpos':
             if self.xpos_cnt == 19:
                 self.data = ((not bit) << self.xpos_cnt) | self.data
@@ -165,6 +170,15 @@ class Decoder(srd.Decoder):
                 self.ypos_first = es
                 self.ypos_cnt = 0    #当前坐标 位数归零,准备累积
                 self.data = 0        #当前坐标值归零,准备开始累积
+        elif self.state == 'HEADER3':
+            self.header2_str += str(bit)
+            self.head2_cnt = self.head2_cnt+1
+            if self.head2_cnt == 6:
+                self.put(self.header2_first, es, self.out_ann,[6, ['HEADER_y:' + self.header2_str]])
+                self.state = 'ypos'
+                self.ypos_first = es
+                self.ypos_cnt = 0    #当前坐标 位数归零,准备累积
+                self.data = 0        #当前坐标值归零,准备开始累积
         elif self.state == 'ypos':
             if self.ypos_cnt == 19:
                 self.data = ((not bit) << self.ypos_cnt) | self.data