Instead of the SH and DE commands to specify the data you want to read, you can use the DP, DC and DF commands. This technique is more awkward for a single data element, but is sometimes easier to use for complicated plots with multiple data elements; see section 4.5.
Command[ ]? DP ;
Command[ ]? DC
DataElement,...[ ]? DE MB-IP-SL
DataElement,...[ ]? SH 55806
DataElement,...[ ]? ; !end DC command
Command[ ]? GO !read and plot