Rockwell Automation 2706-DXX Dataliner Message Display DL5 Series - Manual (Page 54)

2706-UM001A-US-P
7-4 Using the Parallel Port
Using Binary Data Input In the binary (Run) mode, the DL5 interprets data on terminals D0 through
D13 as binary data. Terminals D14 and D15 are the strobe lines. Terminal
D0 represents the least significant digit and D13 represents the most
significant digit. A data line may either be at ground level, which represents
a binary value of 0, or a data line may have a voltage present, which
represents a binary value of 1.
The convention of having a voltage represent a value of 1 and ground
representing a value of 0, is known as positive binary logic (high true logic).
The opposite convention is known as negative binary logic (low true logic).
You can set the DL5 to accept either positive or negative logic (high or low
true), refer to Chapter 8. The following table shows the value of each data
line. Selecting the binary data run mode is explained in Chapter 8.
Binary Values of the Data Lines
The table below shows the control functions of the strobe lines:
Example: Assume that the following logic levels (positive logic) appear on
the data lines.
Adding the values of the individual data lines provides the value being
entered, in this example 4,241. Since strobe line D14 is high (voltage
present) and D15 is low (ground level), this value is interpreted as variable
data.
Data Line Value When On
(True)
Data Line Value When On
(True)
D0 1 D8 256
D1 2 D9 512
D2 4 D10 1,024
D3 8 D11 2,048
D4 16 D12 4,096
D5 32 D13 8,192
D6 64 D14 Strobe Line
D7 128 D15 Strobe Line
D14 D15 Function
High or Low High Indicates that binary value on D0 through D13 represents a
message number.
High Low Indicates that binary value on D0 through D13 represents
variable (numeric) data.
Low Low Binary value on D0 through D13 is ignored.
Data Line: D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15
Logic Level: 1 0 0 0 1 0 0 1 0 0 0 0 1 0 1 0
Value: 1 0 0 0 16 0 0 128 0 0 0 0 4,096 0 0 0