ibaPDA-Handbuch
A TCP/IP tutorial, RFC1180 (https://www.rfc-editor.org/rfc/rfc1180.html)
Transmission Control Protocol, RFC793 (https://www.ietf.org/rfc/rfc793.txt)
Modbus Messaging Implementation Guide V1 (https://modbus.org/)
Modbus Application Protocol V1.1 (https://modbus.org/)
Modbus Protocol Reference Guide Rev J, Modicon
