Current DFS/VME specification:
tjmartin 5/16/94, clarifications 11/29/95.
 
DFS data structure contents is all ASCII text except for the header and
trailer bytes.  There is a single space delimiter between all text fields.
 
Each DFS average is contained in a single record that contains 11 fields
of header information followed by fields of dfs amplitude values.
 
An example transmission follows.  The ($01) and ($03) are meant to represent
the single byte SOH and ETX bytes that bracket the DFS data structure.
 
($01)V1.0 05151994 154500 10 250 64 32 41 100 0 2800 100 124 135 130 ...
The record ends with <cr><lf>($03)
 
Header fields:
1   V1.0        VME/DFS version number.
2   05151994    month day year.
3   154500      hour minute second at end of DFS profile.  For ABLE data UTC.
4   10          number of sodar vertical pulses per DFS profile. (cdin)
5   250         sodar operating bandwidth in Hz. (bw or srate/2)
6   64          time between DFS levels in milliseconds. "delta"
7   32          number of A/D samples in each DFS value. (cdid)
8   41          number of DFS values to expect in this record.
9   100         sodar acoustic pulse length in milliseconds. (pulw)
10  0           sodar axis used for DFS (cdia=0,1,2. 0 means vertical)
11  2800        sodar carrier frequency in Hz. (freq)
 
DFS data values are in units of millivolts.