49 C.F.R. § 395.24 – Driver responsibilities—In general.

(a) In general. A driver must provide the information the ELD requires as prompted by the ELD and required by the motor carrier.
(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”.
(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.
(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.