RCN-121 Draft 18-Sept-2022 has the following updates:
Function outputs F0F, F0R, AUX1, and AUX2 must always be supported by the decoder.
"Train Bus" lines are available for use as "TTL/LVTTL General Purpose output" or as open collector/drain inputs switched against ground (GPIO_A and GPIO_B).
GPIO_C and GPIO_D added. GPIO_C is preferred for wheel synchronization in steam locomotives.
If servo control is present, it is recommended to be on GPIO_A and GPIO_B.
Serial buses shall always use the connectors labeled "Train Bus".
Note about V+ generated on the locomotive system board not being connected to V+ on the decoder interface.
Assuming these RCN updates are approved, they shall also be added to S-9.1.1.3.
RCN-121 Draft 18-Sept-2022 has the following updates:
Assuming these RCN updates are approved, they shall also be added to S-9.1.1.3.