Allen-Bradley MicroLogix 1200 Reference Manual page 395

DH-485 Configuration Parameters
When communications are configured for DH-485, the following
parameters can be changed:
Table E.1:
Parameter
Baud Rate
Node Address
Token Hold Factor
Max Node Address
The major software issues you need to resolve before installing a network
are discussed in the following sections.
Software Considerations
Software considerations include the configuration of the network and the
parameters that can be set to the specific requirements of the network.
The following are major configuration factors that have a significant effect
on network performance:
• number of nodes on the network
• addresses of those nodes
• baud rate
The following sections explain network considerations and describe ways
to select parameters for optimum network performance (speed). Refer to
your programming software's documentation for more information.
Number of Nodes
The number of nodes on the network directly affects the data transfer
time between nodes. Unnecessary nodes (such as a second programming
terminal that is not being used) slow the data transfer rate. The maximum
number of nodes on the network is 32.
Options Programming Software Default
9600, 19.2K 19.2K
1 to 31 decimal 1
1 to 4 2
1 to 31 31
Protocol Configuration E-3
Publication 1762-RM001C-EN-P