TMEX API 1-Wire SDK Help
TMEX API 1-Wire SDK HelpThe basic design of TMEX is based on the International Standards Organization (ISO) reference model of Open System Interconnection (OSI). Its layered protocol includes five layers: Session layer, File Operations layer, Transport layer, Network layer and Hardware Specific layer.
The TMEX commands are listed in the appropriate layer according to their function.
The TMEX commands are listed in the alphabetical order.
- TMEX provides many kinds of application programming interface (API) calls to verify which 1-Wire device is being communicated with and the results of that communication. Most communication with iButtons is a temporary contact.
- Each 1-Wire device has a guaranteed unique serial number (ROM) and multiple 1-Wire devices can be communicated with on the same communication channel (1-Wire Communication). TMEX provides API calls that read these CRC verified serial numbers and each data-oriented API call to a 1-Wire device is preceded by its unique serial number to prevent any ambiguity.
- All data is stored in the structure “ Universal Data Packet “. TMEX provides the ability for several applications to communicate on the same 1-Wire network without data corruption.
The TMEX DLL drivers must be in a directory that can be found by the Microsoft Windows application. The 1-Wire Drivers installation program will automatically copy the drivers into the Windows\System sub-directory. It is recommended that the end user install the 1-Wire Drivers and then install the target application. The DLL drivers are designed such that there is a main driver and then a series of Hardware Specific sub-drivers.
The 1-Wire File Structure is the foundation of the Presentation Layer of TMEX. It provides a directory structure for data stored on a 1-Wire device, allowing named files to be randomly accessed. The data organization of the 1-Wire File Structure is very similar to that of a floppy disk. A sector of a floppy roughly corresponds to a memory page of a 1-Wire device. The directory tells which files are stored, where the data is located in the device, and how many pages it occupies. The 1-Wire File Structure is carefully designed to provide high speed and optimal performance in a Touch environment. Every memory page can be read, CRC-checked or written without the need to access other pages. If a file is modified, only the affected pages need to be rewritten.
Shows all TMEX Error Return Codes in each layer.
