Allen-Bradley MicroLogix 1200 Reference Manual page 396

E-4 Protocol Configuration
Publication 1762-RM001C-EN-P
Setting Node Addresses
The best network performance occurs when node addresses are assigned
in sequential order. Initiators, such as personal computers, should be
assigned the lowest numbered addresses to minimize the time required to
initialize the network. The valid range for the MicroLogix controllers is 1
to 31 (controllers cannot be node 0). The default setting is 1. The node
address is stored in the controller Communications Status file (CS0:5/0 to
CS0:5/7). Configure the node address via Channel Configuration using
RSLogix 500. Select the Channel 0 tab. The node address is listed as
Source ID.
Setting Controller Baud Rate
The best network performance occurs at the highest baud rate, which is
19200. This is the default baud rate for a MicroLogix devices on the
DH-485 network. All devices must be at the same baud rate. This rate is
stored in the controller Communications Status file (CS0:5/8 to CS0:5/15).
Configure the baud rate via Channel Configuration using RSLogix 500.
Select the Channel 0 tab.
Setting Maximum Node Address
Once you have an established network set up, and are confident that you
will not be adding more devices, you may enhance performance by
adjusting the maximum node address of your controllers. It should be set
to the highest node address being used.
All devices should be set to the same maximum node
IMPORTANT
address.
MicroLogix 1200 and 1500 Remote Packet Support
These controllers can respond and initiate with device's communications
(or commands) that do not originate on the local DH-485 network. This is
useful in installations where communication is needed between the
DH-485 and DH+ networks.