Rockwell Automation 2755-G6-D Scanner with RS-232 Option - Manual (Page 42)

General Setup Parameters
Chapter 5
5–8
External trigger operation enables an external device
to control scanning. External trigger is controlled by
applying an external trigger signal to the CTS
input (refer to Appendix D) with external triggering
enabled. When active, this signal causes scanning to
begin just as if the scanner’s trigger were pressed.
Scanning continues until a label is decoded or the
external signal is deactivated.
Note: CTS protocol cannot be used when external
triggering is enabled.
When a decode occurs, the trigger signal must be
deactivated for a minimum of 50 milliseconds before
another scan can be attempted (tying the trigger
signal active does not cause continuous scanning and
decoding).
When External Trigger (+) is scanned, scanning begins
when a low level input is applied to the CTS input.
Conversely, when External Trigger (–) is scanned,
scanning begins when a high level is applied to CTS.
When CTS is not connected, it is treated as if a low
level is applied.
HE External Trigger (+)
HA Disable External Trigger *
HF External Trigger (–)
External Trigger
Operation