Allen-Bradley 2755-HDG-4 User Manual page 26

Connect the scanner to an RS-232 port as shown below. A separate
power supply provides power to the scanner. The power supply plugs
into the RS-232 Synapse cable.
Power Supply
Note: The power supply
should be connected last.
Connecting and Operating Scanner
Scanner Cable
RS-232 Synapse Cable
(2755-HFC-SR3-01 shown)
To Host RS-232 Port
Host with RS-232 Port
2-7
Scanner
Publication 2755-6.2