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ScopeMeter 97 rev eng:

from serial traces by Ethan W., and from ScopeReader 
decompiled to source code

 general response format
   ackCode<cr>       0 = ok
   [resp data<cr<]

 ident: 
   ID<cr>
 response:
   0<cr>
   ScopeMeter Model 97 ...

 set baud: 
 (ScopeReader uses:)  PC19200,n,8,1<cr>
 (traces show): PC 9600,N,8,1,XONXOFF<cr>
                PC1200,N,8,1,XONXOFF<cr>
 response:
   0<cr>

 query measurement in volts: 
   QM[idx],V<cr>   (with idx = 1..12)
 response format: ??

 query setup: 
   QS<cr>
 response:
   0<cr>
   a long setup string<cr>

 program setup: 
   PS[setupstr]<cr>  (e.g PS0,491238aj,asdkj...)
  and setupstr formatted like the response to QS

 query waveform: 
   QW10[ch],V<cr>   (ch=A,B,C with C probably being maths)
  e.g.
   QW101,V or QW102,V or QW103,V
 response:
   (no traces yet)
 response format: ??

 query print / screenshot: 
   QP<br>
 response:
   0<cr>
   7445,
     .@.M.k. ScopeMeter 97.....A..*.....$D$ (7445 bytes+<cr>)
  response format: ???


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ScopeMeter 99 commands:

 from traces by Stuart P.

 general response format
   ackCode<cr>       0 = ok
   [resp data<cr<]

 ident: ID<cr>
   0<cr>
   ScopeMeter 99 Series II; V6.35; 95-02-02; UHM V1.0<cr>

 set baud: PC 19200,N,8,1,XONXOF<cr>
   0<cr>

 query graphics(?):
   QG129<cr>
 response:
   0<cr>
  7453,(7453 bytes of data)
 response format: ??

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