datafab_bulk_write
result = datafab_bulk_write(us, command, 8);
result = datafab_bulk_write(us, command, 8);
result = datafab_bulk_write(us, buffer, len);
rc = datafab_bulk_write(us, command, 8);
rc = datafab_bulk_write(us, command, 8);
rc = datafab_bulk_write(us, command, 8);