PNPSCADA supports the following protocols at the time of writing:

• BACnet (sub metering per room in: Daiken aircon system, LG aircon system)
• CSV file format, for export and import of bills, profile, readings, etc
• DHCP server (for capturing Metacom modems and Enistic routers)
• DL/T645 (old Hexing, INHE, Hexing concentrators) 
• DLMS/COSEM of sub-types HDLC and TCP (Itron ACE6000 & SL7000, new Hexing, Bluestar, Holley, Landis & Gyr, Wasion-Netvendor, Wasion-Siemens)
• DNS server (for capturing Enistic routers)
• FTP Client (Elspec)
• FTP Server (Sensus Scout, Sensus iPerl)
• Hayes modem AT command set (Truteq modems, Kocos modems via SMS, BillingOnline modems via SMS)
• HTTP/HTTPS Client & Server
• IEC61107 (sub-types: STS Flag, Elster - many flavors, Landis & Gyr, Wasion-Netvendor, ISKRA)
• IP-Telemetry, modem protocol (SyM2, Itron Sparklet, some Landis & Gyr modems)
• Irda, proprietary (Elster, KOCOS)
• json Client (OpenHAB: from there to Elster A1140, Modbus Coil and W-MBus: Sensus, Kamstrup, Friendcom, etc)
• M-Bus (Echelon server, Kamstrup server, or direct via Relay M-Bus Master PW20 module) 
• ModbusTCP and ModbusRTU (PvZ RTU, Schneider, Janitza, PowerCOM modules, etc)
• OPC Client
• Proprietary (EDMI, PRI/Premier, Wasion G3-PLC concentrator protocol)
• Rest XML Server (PNPSCADA web services, USSD integration, Kocos Push meters)
• Rest XML Client (RMS server, Kamstrup server, CommunitySMS for sending SMS, etc)
• SML (SyM2 (squared), SyM2 backplane)
• SMPP for sending SMS
• SMTP Client for sending email
• SNMP (export real time meter values to SCADA system at Mondi Merewent and Namibia Breweries)
• SOAP Client (Echelon server, MeteringOnline server)
• SOAP Server (SAP)
• SQL client
• SSH Client (Accessing Vixnet server for WAN RF water pulse counter and valve)
• Trutalk (Truteq modems, for pulse counting, temperatures, etc)
• Wavenis/Coronis Mesh (Pulse counters for water)
• Wireless M-Bus (via Echelon server, via Kamstrup server or via SDG OpenHAB concentrator: Kamstrup water meters, Sensus iPerl, Sensus Han gas pulse box, Friendcom)
• XML (Have both server and client elements of this, sometimes wrapped in SOAP as with the Echelon server)