Halytech
hydroSpider2 User’s Manual v1.23
Page 105
Appendix G.
DNP3 (Software Option)
Distributed Network Protocol (DNP3), available as a software option, allows a hydrospider2 to
participate in a SCADA environment as an intelligent remote terminal unit (RTU) or outstation,
where it is monitored by a central master station or server.
The hydrospider2 complies with the level 2 subset of the DNP3 protocol (DNP3-L2).
To support low-power operation, the hydrospider2 can be configured to connect to the DNP3 server
and transmit logged data (via “unsolicited responses”) periodically and/or whenever specific alarms
are triggered. No special SIM or IP addressing is required.
Appendix G1.
DNP3 communications settings
The hydrospider2 can communicate with the DNP3 master server through either a LAN (network) or
modem (mobile internet) connection, depending on the Internet method selected on the
In LAN mode, the hydrospider2 will listen for an incoming connection from the DNP3 server. The
SCADA system must be configured to connect to the hydrospider2’s IP address on the Ethernet LAN.
More commonly, the hydrospider2 will use the modem for Internet communications and it would
usually be configured to actively connect to the DNP3 server periodically or in response to alarms.
Note that it is also possible, through the advanced settings page, to enable “Listen” mode with a
modem if you have the LiveSMS option and you have configured the modem to be always on, or on
at scheduled times. However that you would need to use a SIM with a public IP address, or part of a
private network (VPN) that your SCADA server can connect to. Note also that, even when your
modem has a public IP address, it will usually be assigned a new address every time it turns on, and
you need to know the unit’s IP address so that you can enter it into your SCADA system. For these
reasons, unless you have a SIM that provides a static IP address, using DNP3 in “listen” mode isn’t
recommended for modem connections.
The DNP3 Communications settings are found on the Change DNP3 Settings page, accessed via a
“DNP3” link from the Change Setup page:
