SerialPort implements communication with lbs

SerialPort implements communication with lbs Favorites

1. Drag a SerialPort named sp.

2.

The key lies in the processing of datareceived events.

. The baud rate setting is consistent with the meter setting: 1200

. Readbuffersize can be set to the Data Length of the communication protocol: 12

Note the start and end codes: 0x02, 0x03

. Invoke implement delegation, allowing the auxiliary thread to modify the content of the main program-controlled parts (you can also set checkforillegalcrossthreadcils to directly cross-thread jobs)

(Reference: http://www.cnblogs.com/worldreason/archive/2008/06/09/1216127.html)

1. Using system;
2. Using system. Collections. Generic;
3. Using system. componentmodel;
4. Using system. Data;
5. Using system. drawing;
6. Using system. text;
7. Using system. Windows. forms;
8. Using system. Io. ports;
9. Using system. Threading;
11. Namespace WMS. SD. deliverygoods
12. {
13. Public partial class frmupload: Form
14. {
15. Private delegate void handleinterfaceupdatedelegate (string astring );
16. Handleinterfaceupdatedelegate interfaceupdatehandle;
18. Static string strreceive; // buffer for receiving data
20. Public frmupload ()
21. {
22. Initializecomponent ();
23. }
25. Private void frmupload_load (Object sender, eventargs E)
26. {
27. // Whether cross-thread access is allowed
28. // Checkforillegalcrossthreadcils = false;
30. Interfaceupdatehandle = new handleinterfaceupdatedelegate (showtext );
32. Try
33. {
34. If (! Sp. isopen)
35. {
36. Sp. open (); // Method for enabling the serial port
37. }
39. Btngetweight. Enabled = false;
41. } // Throw an exception
42. Catch (exception ex)
43. {
44. MessageBox. Show (ex. Message. tostring ());
45. }
46. }
49. Private void showtext (string astring)
50. {
51. // Display data according to the communication data specification
52. This. lbldata. Text = astring. substring (1, 5) + "." + astring. substring (5, 1 );
54. }
56. Private void btngetweight_click (Object sender, eventargs E)
57. {
58. Try
59. {
60. Btngetweight. Enabled = false;
62. If (! Sp. isopen)
63. {
64. Thread. Sleep (5000 );
65. Sp. open (); // Method for enabling the serial port
66. }
68. } // Throw an exception
69. Catch (exception ex)
70. {
71. MessageBox. Show (ex. Message. tostring ());
72. }
74. }
76. Private void sp_datareceived (Object sender, system. Io. Ports. serialdatareceivedeventargs E)
77. {
78. Try
79. {
80. // Obtain the first byte
81. If (sp. isopen)
82. {
83. Byte firstbyte = convert. tobyte (sp. readbyte ());
85. // Determine whether the first byte is the start bit: hexadecimal 0x02
86. If (firstbyte = 0x02)
87. {
88. // Define the length of the received data
89. Int bytesread = sp. readbuffersize;
90. // Data receiving byte array
91. Byte [] bytesdata = new byte [bytesread];
92. // Receive byte
93. Byte bytedata;
94. For (INT I = 0; I <= bytesread-1; I ++)
95. {
96. Try
97. {
98. If (sp. isopen)
99. {
100. Bytedata = convert. tobyte (sp. readbyte ());
101. // Determine the data end byte
102. If (bytedata = 0x03)
103. {
104. Break;
105. }
106. Bytesdata [I] = bytedata;
107. }
108. }
109. Catch (exception ex)
110. {
111. // MessageBox. Show (ex. Message + ex. GetType (). fullname );
113. }
114. }
115. // Convert the byte array into a string
116. Strreceive = system. Text. encoding. Default. getstring (bytesdata );
118. // This. lbldata. Text = strreceive. substring (1, 5) + "." + strreceive. substring (5, 1 );
120. // Invoke (interfaceupdatehandle, strczdata );
122. Begininvoke (interfaceupdatehandle, strreceive );
124. }
125. }
126. }
127. Catch (exception ex)
128. {
129. // MessageBox. Show (ex. Message + ex. GetType (). fullname );
130. }
131. }
133. Private void btnexit_click (Object sender, eventargs E)
134. {
135. If (sp. isopen)
136. {
137. Sp. discardinbuffer ();
138. Sp. Close ();
139. }
140. This. Close ();
141. }
143. Private void btnreset_click (Object sender, eventargs E)
144. {
145. Try
146. {
147. If (sp. isopen)
148. {
149. Sp. discardinbuffer ();
150. Sp. Close ();
151. }
153. This. lbldata. Text = "";
155. Btngetweight. Enabled = true;
156. }
157. Catch (exception ex)
158. {
159. MessageBox. Show (ex. Message );
160. }
161. }
163. Private void frmupload_formclosing (Object sender, formclosingeventargs E)
164. {
165. If (sp. isopen)
166. {
167. Sp. discardinbuffer ();
168. Sp. Close ();
169. }
170. }
171. }
172. }