Page
26
AN-X-AMXCAPT
January 2008
Captured Data Format
The following sample output shows a capture from DCSNet, selected using the sample
option file QTS_All.opt. Lines have been truncated for clarity. The network consists of
a DCS master and a single slave drop 55.
10: a 0.017,109 g.... | 255< 00^ 53-
11: a 0.018,323 g........ | 255< 05^ 55- 11 11 22 22 33 33 44 44 55 55 66 66
12: a 0.021,285 g.. | 255< 26^ 55- 00 00 00 00 00 00 00 00 00 00 00 00
13: a 0.022,563 g.... | 255< 00^ 54-
14: a 0.023,779 g........ | 255< 05^ 55- 11 11 22 22 33 33 44 44 55 55 66 66
15: a 0.026,741 g.. | 255< 26^ 55- 00 00 00 00 00 00 00 00 00 00 00 00
16: a 0.028,020 g.... | 255< 00^ 1-
17: a 0.029,235 g........ | 255< 05^ 55- 11 11 22 22 33 33 44 44 55 55 66 66
18: a 0.032,197 g.. | 255< 26^ 55- 00 00 00 00 00 00 00 00 00 00 00 00
19: a 0.033,477 g.... | 255< 00^ 2-
20: a 0.034,692 g........ | 255< 05^ 55- 11 11 22 22 33 33 44 44 55 55 66 66
21: a 0.037,651 g.. | 255< 26^ 55- 00 00 00 00 00 00 00 00 00 00 00 00
22: a 0.038,933 g.... | 255< 00^ 3-
23: a 0.040,148 g........ | 255< 05^ 55- 11 11 22 22 33 33 44 44 55 55 66 66
24: a 0.043,107 g.. | 255< 26^ 55- 00 00 00 00 00 00 00 00 00 00 00 00
25: a 0.044,387 g.... | 255< 00^ 4-
26: a 0.045,600 g........ | 255< 05^ 55- 11 11 22 22 33 33 44 44 55 55 66 66
27: a 0.048,560 g.. | 255< 26^ 55- 00 00 00 00 00 00 00 00 00 00 00 00
28: a 0.049,840 g.... | 255< 00^ 5-
29: a 0.051,054 g........ | 255< 05^ 55- 11 11 22 22 33 33 44 44 55 55 66 66
30: a 0.054,015 g.. | 255< 26^ 55- 00 00 00 00 00 00 00 00 00 00 00 00
31: a 0.055,302 g.... | 255< 00^ 6-
32: a 0.056,517 g........ | 255< 05^ 55- 11 11 22 22 33 33 44 44 55 55 66 66
Each line starts with a reference number. For example, the first line shown has a
reference number of 10.
Next is the frame timestamp. The first frame has a timestamp of 0.015245 seconds.
This is followed by a graph of the gap time.
The next three bytes are the frame header.
The first byte of the header is the destination, 255 for all frames shown in this example.
This indicates a broadcast frame. All DCS frames are broadcast, since all drops must
monitor I/O updates to all other drops.
The second byte of the header is the Ctl byte. It indicates the frame type.
The third byte of the header is the drop. On I/O updates from the master, the drop is the
drop number receiving the data. On I/O updates to the master, the drop is the drop
sending the data.
