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Method of detecting interfaces by a host on a serial port:
1.The host sends a detection frame (ID 0010 hex) with an hex number 000 (decimal 0).
Binary frame format:
1 |
0 |
0 |
1 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
ID detection
On receipt of this frame, an interface present (other than DDO12 or DDO120) immediately responds with a presence frame.
This frame differs from a normal frame by the presence of a key code equal to 7E hex in the last byte.
It also returns the STATUS OF NON-FUGITIVE CONTACTS at the time of detection.
Sample response for a DDO110:
0 |
1 |
0 |
1 |
0 |
0 |
0 |
0 |
ID DD110 |
1 |
T37 |
T28 |
T27 |
T18 |
T17 |
T08 |
T07 |
Fugitive states |
1 |
0 |
0 |
T43 |
T42 |
T41 |
T40 |
T38 |
Fugitive states |
1 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
1 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
Code 7E hexa |