Parallel port timing requirements – Rockwell Automation 2706-DXX Dataliner Message Display DL5 Series User Manual

Page 77

2706-UM001A-US-P

Using the Variable Data Feature

9-5

Parallel Port Timing
Requirements

The following is an example of how the strobe commands are used. In this
example, message #12 , which contains a two digit variable, is triggered.
The message that was entered for message #12 appears like this:

First the controller sends the variable value (BCD format) for message #12
to the DL5. Then the controller sends the trigger for message #12. The
figure below illustrates the timing of the data transfer and message trigger.

The following describes what occurs during each of the timing intervals.

t0- During t0 the variable data 35 and strobe line D14 to indicate variable

data is set on the data lines.

t1- During t1 the value of 35 and strobe line D14 are maintained for 110

milliseconds.

t2- During t2 the message number 12 is placed on the data lines, and

D15 is set to indicate a message number. D14 is reset.

t3- During t3 the message number 12 and strobe line D15 are maintained

for 110 milliseconds.

The timing example (previous page) shows the minimum hold time (110

milliseconds) that is required for each step of the variable data
transfer and message trigger.

63((' ,6AA)36

BCD Message Number Timing Example

D10

D11

D12

D13

D14

D15

110 ms