> For the complete documentation index, see [llms.txt](https://book.jorianwoltjer.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://book.jorianwoltjer.com/networking.md).

# Networking

- [Modbus - TCP/502](https://book.jorianwoltjer.com/networking/modbus-tcp-502.md): A protocol for PLCs to store values in coils, inputs, and registers at addresses
- [Redis/Valkey - TCP/6379](https://book.jorianwoltjer.com/networking/redis-valkey-tcp-6379.md): An in-memory data store often used to store small data like cache, sessions or queues