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The SAE J2716 SENT (Single Edge Nibble Transmission) protocol is a point-to-point scheme for transmitting signal values from a sensor to a controller. It is intended to allow for high resolution data transmission with a lower system cost than available serial data solution.
Data are transmitted in units of 4 bits (1 nibble) for which the interval between two falling edges (single edge) of the modulated signal with a constant amplitude voltage is evaluated. A SENT message is 32 bits long (8 nibbles) and consists of the following components: 24 bits of signal data (6 nibbles) that represents 2 measurement channels of 3 nibbles each (such as pressure and temperature), 4 bits (1 nibble) for CRC error detection, and 4 bits (1 nibble) of status/communication information. Optionally, data can be transferred in 20 bit messages (5 nibbles) composed of a single 12 bit (3 nibble) measurement, a 4 bit (1 nibble) CRC error checksum, and a 4 bit (1 nibble) status/communication field.