Strobe Line Mnemonics - Allen-Bradley A-B QUALITY DL20 Series User Manual

Chapter 8
Special Functions
Debug Mode
Clear RAM
8–18
Use the debug mode to check the status of the parallel port inputs. The
debug mode checks the parallel port and displays the status of each line. The
debug mode uses the parallel port sampling method specified in the Set
Parallel Port function. Remember that if edge triggered strobe is selected,
the ETS inputs must be toggled. For example, if D2 and D0 were at a logic 1
(positive logic) and all other data lines were 0, the display would look like
this:
5
Decoded Value
of Data Lines
Note: If BCD input is selected and an invalid digit (> 9) is entered, an
asterisk is displayed.
Use Table 8.C to interpret the strobe line mnemonic name.
Table 8.C

Strobe Line Mnemonics

Status
NULL
LDAT
HDAT
MSGA
The Clear RAM option allows you to delete all message data in the DL20.
Since this data cannot be recovered, you are requested to confirm the
operation.
You must answer Yes to both of these prompts to clear the memory.
0 0 0 0 0 1 0 1 MSGA
Status
Status
Strobe Lines
Data Lines 0 through 7
MS0
0
1
0
1
SURE? N
POSITIVE? N
MS1
0
0
1
1