Rockwell Automation 2706-DXX Dataliner Message Display DL5 Series - Manual (Page 70)

2706-UM001A-US-P
8-6 Special Functions
Debug Special Function The Debug special function is very valuable if you are having difficulty
triggering messages properly in the run mode. The debug function allows
you to visually determine whether or not a voltage is applied to a DL5 data
line. If you respond to the DEBUG? prompt by pressing the [Y] and [Retrn]
keys, the DL5 displays the status of the data lines:
The debug mode display consists of sixteen characters (ones and zeros).
This display represents the condition of the sixteen data lines. The
character on the far left represents data line D15 and the character on the
right represents data line D0. If you have set the parallel port for negative
logic, a voltage on a data line will be represented by a 0. If positive logic is
selected, a voltage on a data line will be represented by a 1. For example,
assume that a debug mode display appears like this:
If positive logic has been selected, the above display would indicate that
there is a voltage present on data lines D2, D5, D6, and D11. If negative
logic has been selected, the above display would indicate that there is a
voltage present on data lines D0, D1, D3, D4, D7, D8, D9,D10, D12, D13,
D14, and D15.
To exit the debug mode, press the [Esc] key three times.
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