Interlogix NS3550-2T-8S Installation Guide - Manual (Page 10)

6 IFS NS3552-8P-2S and NS3550-2T-8S Quick Installation Guide
2. When the following screen appears, make sure that the COM port
should be configured as:
♦ Baud
: 115200
♦ Parity
: None
♦ Data bits
: 8
♦ Stop bits
: 1
♦ Flow Control : None