TYPICAL LAYOUTS
6
6.2 PASS-THROUGH
Pass-through mode allows two or more devices to be connected to a single external serial
interface.
Each reader transmits the messages received by the Auxiliary interface onto the Main
interface. All messages will be passed through this chain to the host.
When One Shot or Phase Mode operating mode is used, the reader can be activated by an
External Trigger (for example a pulse from a photoelectric sensor) when the object enters its
reading zone.
Applications can be implemented to connect a device such as a hand-held reader to the
Auxiliary port of the last reader in the chain for manual code reading capability.
The Main and Auxiliary ports are connected as shown in the figure below:
2 1
2
11
Device#1 Device#2 Device#n
3 3 3
Main Serial Interface (RS232 only)
Auxiliary Serial Interface (RS232)
External Trigger (for One Shot or Phase Mode)
2
Power
Host
Figure 88 – Pass-Through Layout
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