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SCANNER A Port
Optional LCD Display
LED Indicators
Scanner Ports
The Dual-Head Decoder has two scanner ports, labeled Scanner A and
Scanner B. The Single-Head Decoder has only the Scanner A port. Figures
1 and 2 show the location of the ports.
The scanner ports support all of the Allen-Bradley medium and high speed
bar code scanners (see Accessories section). The scanners do not require a
separate power supply; they receive power directly from the decoder. The
NEMA Type 1 version of each decoder also supports all of the Allen-Bradley
stop and scan Visible Laser Diode (VLD) fixed mount and hand-held
scanners when used with the 2755-NC16 gun adapter.
The scanners on the Dual-Head Decoders can operate in two modes:
Coordinated Mode (Coordinated 1 and Coordinated 2)
Scanners A and B operate in a coordinated mode, each using the same
trigger source (Scanner A).
Independent Mode (Independent Package Detect or Host Triggered)
Scanner A and Scanner B operate with independent triggers.
Figure 2
NEMA Type 4 Version
SCANNER B Port
(DD Versions Only)
ALLEN-BRADLEY
POWER
LASER ON A
CPU ACTIVE
TRIGGER ACTIVE A
COMMUNICATION
VALID READ A
Holes for Conduit or
Optional Output Module Connectors
The Single-Head Decoder cannot be upgraded to include a second port.
Product Data
Bulletin 2755
Single/Dual-Head Enhanced Bar Code Decoders
AUX Port
HOST Port
RS-232
RS-232/422 &485 w/DH485 Protocol
BAR CODE DECODER
DISCRETE I/O
LASER ON B
1 2 3 4 5 6 7 8
TRIGGER ACTIVE B
VALID READ B
ON/OFF
Toggle Switch
NEMA Type 4
Power Connector
3
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