Description of the TRT Readout Scheme

This paper documents the TRT detector readout scheme. A description is provided of the data buffers used in the TRT readout chain: the single TRT channel output data format, the DTMROC output data buffer format, the TRT-ROD input FIFO data format, the TRT-ROD output buffer format, and the ROB output buffer data format. Also documented are the current designs for the TRT-ROD zero suppression and data compression schemes. A proposal is presented for ordering the data generated by individual TRT channels suitably for Level-2 triggering, Level-3 triggering and offline data processing.