With the GMI command, you can ask the board to send meta information. After receiving the command, the board will send all meta information in separate messages per datatype. First in the string the identifier of the message, then the type of data, the number of tagnames (0..99) and then the individual tagnames and there pin numbers, separated by commas. 

CommandHMIBoardSyntax
GMISendReceive@GMI
GMIReceiveSend@GMIDI,<#>,<tagname,pin,report,poll,mask>,<..>
@GMIDO,<#>,<tagname,pin,report,poll,auto>,<..>
@GMIAI,<#>,<tagname,pin,poll,mask>,<…>
@GMIAO,<#>,<tagname,pin,poll,auto>,<..>
@GMISO,<#>,<tagname,pin,poll,auto>,<..>
@GMIDM,<#>,tagname,trigger,echo,poll,mask>,<..>
@GMITT,<#>,<tagname,pin,poll,mask>,<…>
@GMIBM,<MANUAL|AUTOMATIC>
@GMIMS,<MASK|AUTOMATIC>
Possible error messages coming from the board
%GMI-UNKCMD-BTSERIAL, String not processed
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