49 CFR §395.24

1. (a)In general. A driver must provide the information the ELD requires as prompted by the ELD and required by the motor carrier.
2. (b)Driver's duty status. A driver must input the driver's duty status by selecting among the following categories available on the ELD:
   1. (1)“Off duty” or “OFF” or “1”;
   2. (2)“Sleeper berth” or “SB” or “2”, to be used only if sleeper berth is used;
   3. (3)“Driving” or “D” or “3”; or
   4. (4)“On-duty not driving” or “ON” or “4”.
3. (c)Miscellaneous data.
   1. (1)A driver must manually input the following information in the ELD:
      1. (i)Annotations, when applicable;
      2. (ii)Driver's location description, when prompted by the ELD; and
      3. (iii)Output file comment, when directed by an authorized safety officer.
   2. (2)A driver must manually input or verify the following information on the ELD:
      1. (i)Commercial motor vehicle power unit number;
      2. (ii)Trailer number(s), if applicable; and
      3. (iii)Shipping document number, if applicable.
4. (d)Driver use of ELD. On request by an authorized safety official, a driver must produce and transfer from an ELD the driver's hours-of-service records in accordance with the instruction sheet provided by the motor carrier.