Allen-Bradley A-B QUALITY DL20 Series User Manual page 103

Setting Parallel Port
Data Formats
The parallel port can be configured to accept either binary or BCD data for
either message triggers or variable data. This allows you to input variables in
a BCD format and triggers in a binary format (allows full 1022 message
capability).
Important: Binary data must be selected if the serial port is being used for
message triggers.
Data Sampling
Sampling of the data on the parallel port can be either:
Event driven using an edge triggered strobe (ETS) input
Time driven using a set sample rate
Logic Levels
The parallel port can be configured to accept either:
High true logic where:
On state = 1 = voltage across input
Low true logic where:
On state = 0 = no voltage across input
High true logic is the default.
Message Prompts
After selecting Set Parallel Port, you are prompted for the logic level.
After selecting the logic level, you are prompted for the message data type
(binary or BCD).
You are then prompted for the variable data type (binary or BCD).
After selecting the data types, you are prompted for the type of data sampling
(time or event driven).
Note: It is recommended that you use time driven sampling unless a non
Allen-Bradley programmable controller with word I/O modules is used.
If you select event driven sampling, you are prompted for the trigger
transition (high to low or low to high).
Chapter 8
Special Functions
HI TRUE LOGIC? Y
BINARY MSG DATA? N
BINARY VAR DATA? N
TIME SAMPLE? Y
USE HI TO LOW?
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