o  robot_info - This is the address of a robot_info_t structure
       initialized using mrd_startup(3mrd) or mrd_show(3mrd). This
       data structure contains the element starting address and
       counts for each type of element, which are needed to map an
       absolute element to the correct zero relative address and
       type.

    o  type - This is the element type code about which information
       is desired. The mrd_common.h include file defines the
       constants SLOT, PORT, DRIVE and TRANSPORT which may be used.

    o  start - The absolute element address of the first element for
       which information is desired.

    o  count - The number of elements for which the information is
       desired.

    o  data - This is the address of an array of unsigned characters
       where the element status data will be written. Interpretation
       of the data is left to the caller.

    o  length - This is the amount of element_status data, in
       bytes, available for the Read Element Status request. If the
       requested number of elements requires more space only data for
       as many elements as will fit will be copied.

    o  dev_status - The dev_status is the address of a dev_status_
       t structure, which is used to pass back detailed error
       information in the event of a command failure.