Problem connecting to sx1276

Hi, I would like to communicate between an E220-900T30D and a SX1276 (ESP32 WiFi Heltec v2) but on the SX1276 side (with Arduino Lora class) I have to set discrete parameters for frequency, syncword, spreading factor, bandwidth and coding rate. Unfortunately there is no documentation what parameters the E220 is using depending on the air data rate selection. Has anybody managed to get a message through between these systems / frameworks? Any help would be appreciated. Deti