Specifications

A-19 TTL INPUT CONTROL
STATEMENT
On the parallel port, there are five TTL compatible input lines that
can be used for controlling the flow of a sequence. When an external
device connected to the parallel port has a switch needing activation,
the sequence has to check the TTL state of the input line
corresponding to that switch. The sequence can then jump to other
sequences depending on whether the line is high or low.
Create a Sequence with TTL Input Control (listing appears at
left)
Step 1.
Press Seq/EDIT SEQUENCE/SEQUENCE 2.
Step 2.
Press Display/GRAPH TYPE/LOG MAGNITUDE.
Step 3. Press Seq then the following soft keys:
TTL I/O
PARALLEL IN BIT
Step 4. Enter “0” from the keypad.
Step 5. Press then the following soft keys:
IF PARALLEL IN BIT HIGH
SELECT EXISTING SEQUENCE
SEQUENCE 3
Step 6. Press Seq then the following soft keys:
SEQ
TTL I/O
IF PARALLEL IN BIT LOW
SELECT EXISTING SEQUENCE
SEQUENCE 4
Step 7.
Press Seq/DONE SEQUENCE EDIT.
This sequence is stored in memory as
SEQUENCE 2/NAME 2.
Sequences 3 and 4 must exist prior to execution of
Sequence 1.
SEQUENCE TTL OUTPUT FOR CONTROLLING
OPERATIONS PERIPHERALS
MS462XX OM A-19
BEGIN OF SEQUENCE
LOG MAGNITUDE
TTL IN BIT 0
IF BIT HIGH SEQ 3
IF BIT LOW SEQ 4
Sequence 2