Serial Port Communication The sample code linked to this page consists of a VB module containing a collection of routines to perform serial port I/O without using the Microsoft Comm Control component. The module uses the Windows API to perform the overlapped I/O operations necessary for serial communications. The communication routines can handle up to 4 serial ports which are identified with a Port ID. ![]() Please don't hesitate to email us if you have any questions, suggestions or issues. We also welcome feedback on how we can improve our services. Astro lounge smash mouth zippyshare. Astro Lounge is the second studio album by American rock band Smash Mouth, released on June 8, 1999, by Interscope Records. It includes the single ' All Star ', arguably the group's most well-known song, which reached number 4 on the US Billboard Hot 100. Discover releases, reviews, credits, songs, and more about Smash Mouth - Astro Lounge at Discogs. Complete your Smash Mouth collection. Create serial communications programs that access data from a serial port using RS232 or multi-drop RS422 or RS485 ports. WSC also supports virtual serial ports using Bluetooth serial and USB to serial converters. Instrument communication using VISA, via GPIB and USB ports. VISA must be installed on the PC, and in the VBA project, one must include the reference to the “VISA COM 3.0 Type Library.” I’ve had success with the VISA downloads from National Instruments and Agilent. All routines (with the exception of CommRead and CommWrite) return an error code or 0 if no error occurs. The routine CommGetError can be used to get the complete error message. If you have any questions or comments concerning these routines, David can be reached at. Overview The routines in this module facilitate most operations associated with serial communication by encapsulating the API details in easy to call wrapper functions. For example, the CommOpen routine can be used to open and initialize a serial port. CommOpen takes three parameters: the Port ID mentioned above, a port name such as 'COM1' and the desired communication settings (Example: 'baud=9600 parity=N data=8 stop=1'). CommOpen checks to see if the specified port is open. If not, it opens it with a call to the CreateFile API for generic read and write access. Next the port's input and output buffers are initialized by calling the SetupComm API followed by a call to PurgeComm. PurgeComm insures the newly created buffers are clean. After this, the time-out parameters for all of the port's read and write operations are set by populating a COMMTIMEOUTS structure and passing it to the SetCommTimeouts function. CommOpen now sets the control settings (baud rate, parity, etc.) for the port. To do this the current settings are: retrieved into a DCB (Device-Control Block) structure via GetCommState, modified as desired using a call to BuildCommDCB, and set with the SetCommState function. Once this is done, the CommWrite routine can be used to write to the port. As you can see, these routines perform the bulk of the work for you. Collins easy learning english conversation book 1 pdf command. All you need to do is call them appropriately. See the.BAS module and.TXT file for further details. Instructions Download this project and look at the SampleCode.txt file. This file contains samples calls to the communication functions contained in the.BAS module. If you use this code, please mention 'www.TheScarms.com'.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |