Allen-Bradley AB QUALITY ControlLogix 1756 Series User Manual page 72

You should now see the following completed routing table:
r. Click on Apply to download the routing table to the 1756-DHRIO
module.
s. Close the Gateway configuration software.
It is not necessary to save the configuration to a file.
You now need to configure the 1756-ENET module in the right chassis. To
do this, connect your PC (KTX card) to node 3 (channel A) of the
1756-DHRIO module in the right chassis. This provides you with access to
the 1756-ENET module in the right chassis via the backplane.
Publication 1756-6.5.13 - September 1999
9-7