SyncDrive (Plus) is a frame-level synchronous communication driver implemented by a DLL and a device driver. Applications interface to SyncDrive (Plus) through C callable routines and C data structures. The routines provide services for channel configuration, transmitting a buffer, receiving a buffer, setting and monitoring I/O status. Once a handle is opened to the device driver, the application simply reads and writes frames as it would files, without worrying about buffer management, interrupts, or register handling. SyncDrive (Plus) handles start and end flags, synchronization characters, and CRC information on transmit and receive. The C data structures used are for configuration, transmitting and receiving buffers.