The Network Communications card mounts to the back of the Central Processor Unit. The 3-RS485A card provides a Class A (Style 7) or Class B (Style 4) circuit for network communications signals. And two additional Class A (Style 7) circuits for the digitized audio signals.

The 3-RS485B card provides a Class B (Style 4) or Class A (Style 7) circuit for network communications signals. And a second Class B (Style 4) circuit for the digitized audio signals. Network messages the Network Communications card receives a re re-transmitted to the next network node. Re-transmission maximizes the wire run lengths between nodes.

With 64 nodes, miles of network length is possible. Fail-safe mechanisms built into the card directly connect the data input and output ports should the network card. Or its related Central Processor fail. Network communications may b e configured via copper or fiber media using the 3-FIBMB.

The 3-CPU3 is the Central Processing Unit Module, which monitors the status of all modules. And provides the link for network communications. The 3-CPU3 provides all inter-module communication. And can download rail module operating parameters. The 3-CPU3 automatically learns all local rail module attributes and locations upon powering up.  Firmware upgrades a re done from the 3-CPU3, eliminating the need to unplug chips on rail modules. Internal rail communications are accomplished in a broadcast protocol for fast response.
Mounting must be in the first two local rail spaces. Options for the 3-CPU3 include adding an LCD display, User Interface, and RS-232 Communication Card. And RS-485 Series Network Communication Cards.
The 3-CPU3 is fully compatible with the 3-CPU and 3-CPU1 modules.

📄 Datasheet (Technical Specifications):
Download 3-RS485B Datasheet (PDF)

📘 Installation Manual:
Download 3-RS485B Installation Manual (PDF)