Pin mapping from modem(26pin) to 25 pin Sub- sourcedstsignal 1,2,3 → 4,16EXT_PWR 4,5,6 → 3,17EXT_GND 7 → 1ON/OFF 10,13,20,23 → 14,23,25SIG_GND 11 → 9S_TX (Serial Data into SBD) 12 → 13S_RX (Serial Data out) 14 → 10DCD 15 → 21DSR 16 → 22CTS 17 → 7RI 18 → 8RTS 19 → 19DTR 24 → 24network_available 8,9,21,22,25,26 n.c. iridium/sbd.txt Last modified: 2021/04/18 12:35(external edit)