[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 2837 RC232 Q&A Related Knowledge Base Posts -[RC232] Do you have an Unlimited modular approval FCC / IC + EN Test results?[RC232] What do you mean by peer-to-peer communication ?[RC232] “We enable the RTS/CTS option in the DK and we send message longer than 128 bytes (the max buffer size) so we need the CTS to separated the massage. We test this with scope: 1. In the CTS we didn’t see change (I suppose all 128 bytes it needs to change) 2. Also in the Tx/Rx I suppose to see a break in the 128 bytes, but it takes all the massage 3. When I try connect this module to PC, only message shorter than 1024 bytes success to send “