Model railroaders expect a lot from the electronics on their layouts. They want to automate accessories, simplify operation of their staging yards, have fine control over layout lighting, and build realistic dispatcher panels. Home and club layouts are getting more detailed and complicated, and existing electronics for control systems are having a hard time keeping up.
The process of developing networks and protocols for layout control are not trivial. No small group of individuals are able to fully develop the necessary code, protocols and the like to sucessfully impliment the concept of having complete, integrated control of a layout, be it a simple 4 by 8 foot sheet of plywood to a large complex, multi-deck masterpiece. Using the current open source development process, a group named OpenLCB has stepped up to take on this task. You can find the details of their work, process, organization and even how to participate on their development process at their website located at: https://openlcb.org/. OpenLCB is developing the Standards and providing Technical Notes to support those Standards that will be used in the development of hardware to control a layout.
The Standards for LCC® are organized so that each Standard has a corresponding Technical Note. The Technical Notes provide additional information and reasoning about what was and was not included in the Standard. These Standards, developed by OpenLCB, are submitted to the NMRA for review and comment by the membership. Once the reviews are complete, the NMRA Board of Directors adopts the Standards as the official NMRA Standard for Layout Command Control.
|Standard||Tech Note||NMRA Status|
|TN-126.96.36.199 Common Information|
|S-188.8.131.52 Unique Identifiers||TN-184.108.40.206 Unique Identifiers||Adopted 20-Feb-16|
|S-220.127.116.11 Event Identifiers||TN-18.104.22.168 Event Identifiers||Adopted 20-Feb-16|
|S-22.214.171.124 CAN Physical||TN-126.96.36.199 CAN Physical||Adopted 20-Feb-16|
|DATA LINK LAYER|
|S-188.8.131.52 CAN Frame Transfer||TN-184.108.40.206 CAN Frame Transfer||Adopted 20-Feb-16|
|NETWORK & TRANSPORT LAYER|
|S-9.7.3 Message Network (CAN + TCP/IP)||TN-9.7.3 Message Network (CAN + TCP/IP)||Adopted 20-Feb-16|
|S-220.127.116.11 Event Transport||TN-18.104.22.168 Event Transport||Adopted 20-Feb-16|
|S-22.214.171.124 Datagram Transport||TN-126.96.36.199 Datagram Transport||Adopted 20-Feb-16|
|S-188.8.131.52 Configuration Description Information||TN-184.108.40.206 Configuration Description Information||Adopted 20-Feb-16|
|S-220.127.116.11 Memory Configuration||TN-18.104.22.168 Memory Configuration||Adopted 20-Feb-16|
|S-22.214.171.124 Simple Node Information||TN-126.96.36.199 Simple Node Information||Adopted 20-Feb-16|
|STANDARDS UNDER REVIEW|
|S-188.8.131.52 Firmware Upgrade||TN-184.108.40.206 Firmware Upgrade||Published for Comment|
|Broadcast Time Protocol||Broadcast Time Protocol||Awaiting Submission|
|Traction Protocol||Traction Protocol||Awaiting Submission|
Introduction to Layout Command Control® (LCC)