Using bcd data input – Rockwell Automation 2706-DXX Dataliner Message Display DL5 Series User Manual
Page 55
2706-UM001A-US-P
Using the Parallel Port
7-5
Using BCD Data Input
The fourteen data lines can also be used to input BCD formatted data. The
BCD numbering system uses a group of four data lines to represent a single
decimal digit. The table below shows the value of each data line. Selecting
the BCD run mode is explained in Chapter 8.
BCD Values of the Data Lines
Control functions of the strobe lines are the same for BCD data input as for
binary data input.
For example, assume the following logic (positive logic) levels appear on
the data lines.
Adding the values of the individual data lines provides the value being
entered, in this example 1,145. Again, D14 is high (voltage present) and
D15 is low (ground level), so this number is interpreted as variable data.
Data Line
Value When On
(True)
Data Line
Value When On
(True)
D0
1
D8
100
D1
2
D9
200
D2
4
D10
400
D3
8
D11
800
D4
10
D12
1,000
D5
20
D13
2,000
D6
40
D14
Strobe Line
D7
80
D15
Strobe Line
Data Line:
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
Logic Level:
1
0
1
0
0
0
1
0
1
0
0
0
1
0
1
0
Value:
1
0
4
0
0
0
40
0
100
0
0
0
1,000
0
0
0