> For the complete documentation index, see [llms.txt](https://docs.augelab.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication.md).

# Communication

- [Modbus Connect](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/modbus-connect.md)
- [Modbus Read](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/modbus-read.md)
- [Modbus Write](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/modbus-write.md)
- [MQTT Publish (TLS-Beta)](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/mqtt-publish.md)
- [MQTT Subscribe (TLS-Beta)](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/mqtt-subscribe-tls-beta.md)
- [MQTT Subscribe](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/mqtt-subscribe.md)
- [OPC UA Client](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/opc-ua-client.md)
- [OPC UA Read](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/opc-ua-read.md)
- [OPC UA Write](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/opc-ua-write.md)
- [REST API - Get](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/rest-api-get.md)
- [REST API - Post](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/rest-api-post.md)
- [REST API - Request](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/rest-api-request.md)
- [Send Mail](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/send-mail.md)
- [Serial Connect](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/serial-connect.md)
- [Serial Read](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/serial-read.md)
- [Serial Write](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/serial-write.md)
- [Siemens S7 Connect](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/siemens-s7-connect.md)
- [Siemens S7 Read](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/siemens-s7-read.md)
- [Siemens S7 Write](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/siemens-s7-write.md)
- [SQL-DB Client Connect](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/sql-db-client-connect.md)
- [SQL-DB Operations](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/sql-db-operations.md)
- [TwinCAT Connect](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/twincat-connect.md)
- [TwinCAT Read](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/twincat-read.md)
- [TwinCAT Write](https://docs.augelab.com/function-blocks/blocks-reference/input-output/communication/twincat-write.md)