Allen-Bradley controllogix 1756-L55M12 User Manual page 18

18 Directly Connect to the Controller via the Serial Port
Publication 1756-UM001G-EN-P - January 2007
5. Specify the serial port settings.
a. From the Comm Port pull-down menu, choose the serial port
on the workstation to which the cable is connected.
b. From the Device pull-down menu, choose Logix 5550-Serial
Port.
c. Click Auto-Configure.
6. Was the auto configuration successful?
If Then
Yes Click OK.
No Go to step 5. and verify that you selected the correct Comm Port.
7. Click Close.