[RC232] I would like to know how to use the pins N°27 and 28 on the RC2500HP Pin 27 and 28 must be left open. Last Update: August 8, 2017 December 20, 2016 2791 RC232 Q&A Related Knowledge Base Posts -[RC232] Please confirm if packet_length should be configured to total number of bytes including overhead (26 in my case) or only effective payload (15 in my case)[RC232] In the Datasheet of the RC11XXHP-RC232 Module it is written that the Module is “Designed for EX compliance”. What does this mean?[RC232] Should these boards transmit and receive data to each other out of the box? Or, must their addresses and channels be configured first?