I tried the S2C to S2 communication (My S2 module is a XBee Pro Series 2 XB24-ZB, set up with Router AT firmware), the 2 XBees didn’t communicate. I set the same PAN ID, set the S2C to Coordinator Mode, AP to Transparent, DL to FFFF, on the S2, JV is set to Enabled, DL to 0. I set 2 S2 modules on the XBee Shield (Arduino)