Publication 1764-UM001A-US-P
Understanding Communication Protocols
E-9
DH-485 Token Rotation
A node holding the token can send a message onto the network. Each node is
allowed a fixed number of transmissions (based on the Token Hold Factor) each
time it receives the token. After a node sends a message, it passes the token to the
next device.
The allowable range of node addresses is 1 to 31. There must be at least one
initiator on the network (such as a MicroLogix controller, or an SLC 5/02™ or
higher processor).
DH-485 Configuration Parameters
When MicroLogix communications are configured for DH-485, the following
parameters can be changed:
See Software Considerations on page E-13 for tips on setting the parameters listed
above.
Table E.3 DF1 Full-Duplex Configuration Parameters
Parameter
Options
Baud Rate
9600, 19.2K
Node Address
1 to 31 decimal
Token Hold Factor
1 to 4
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