Figure 2-4 External Level Trigger Signals; Figure 2-5 External Edge Trigger Signals; End Of Read Cycle - Microscan MS-7100 User Manual

Chapter 2 Menu Configuration
Selecting:
Serial Data
Serial Data &
External Edge
a. Continuous Read 1 Output will allow an output regardless of how Good Decode Reads is set.
b. Level and Edge apply to the active logic state (positive or negative) that exists while the object is in
a read cycle, between the rising edge (the appearance of an object) and falling edge (disappear-
ance of the object).
First trigger
An object, moving in
1
front of the detector
beam, causes the first
Object
trigger (rising edge
detector
trigger) signal to be sent
to the decoder, initiating
the read cycle.
1
Second trigger
Object
The same object, moving
detector
out of the detector's
beam, causes a second
trigger (falling edge
trigger) signal to be sent
to the decoder, ending
the read cycle.

Figure 2-4 External Level Trigger Signals

End of Read Cycle

Default: Timeout
Options: Timeout, New Trigger, Timeout & New Trigger
Allows you to choose the conditions that will end the read cycle. The read
cycle is the time during which the scanner will receive and process label
2-14
MS-7100/7180 Industrial Scanner User's Manual
Has this effect:
The scanner accepts an ASCII character from the host or
controlling device as a trigger to start a read cycle.
The scanner accepts either an external trigger or a serial
ASCII command to start a read cycle.
1
Object
detector
2
Object
detector

Figure 2-5 External Edge Trigger Signals

First rising edge trigger
Object #1, moving in
front of the detector
beam, causes the first
trigger (rising edge
trigger) signal to be sent
to the decoder, initiating
the read cycle.
Subsequent rising edge
trigger
Object #2, moving in front
of the detector's beam,
causes a second trigger
(rising edge trigger) signal
to be sent to the decoder.
This signal initiates a new
read cycle and ends the
previous read cycle
provided that New Trigger
or Timeout and New Trigger
is enabled and a good read
or timeout has not already
occurred.