2 Setup and Communications
2-14
L-PRO 4000 User Manual
D02706R02.30
2.12 Accessing the Relay’s SCADA Services
The relay supports DNP3 (Level 2) and Modbus SCADA protocols as a stan-
dard feature on all ERLPhase relays. DNP3 is available through a direct serial
link or the Ethernet LAN on top of either TCP or UDP protocols. The Modbus
implementation supports both Remote Terminal Unit (RTU) binary or ASCII
modes and is available through a direct serial link.
The relay’s Port 122 is dedicated for use with Modbus or DNP3 serial proto-
cols. Port 122 uses standard RS-232 signalling. An external RS-232<->RS-485
converter can also be used to connect to an RS-485 network.
For details on connecting to serial Port 122 see “Communicating with the Re-
lay Intelligent Electronic Device (IED)” on page 2-2 and “Communication
Port Details” on page 2-15.
The DNP3 protocol can also be run across the Ethernet LAN. Both DNP over
TCP and DNP over UDP are supported. For details on connecting to the Ether-
net LAN see “Network Link” on page 2-5.
Complete details on the Modbus and DNP3 protocol services can be found in
the Appendices, for details see “Modbus RTU Communication Protocol”
in Appendix E and “DNP3 Device Profile” in Appendix F
Protocol
Selection
To select the desired SCADA protocol go to L-PRO 4000 Offliner SCADA
communications section. Select the protocol and set the corresponding param-
eters.
Communication
Parameters
Port 122’s communication parameters are set in the L-PRO 4000 Offliner
SCADA communications section Both the baud rate and the parity bit can be
configured. The number of data bits and stop bits are determined automatically
by the selected SCADA protocol. Modbus ASCII uses 7 data bits. Modbus
RTU and DNP Serial use 8 data bits. All protocols use 1 stop bit except in the
case where either Modbus protocol is used with no parity; this uses 2 stop bits,
as defined in the Modbus standard.
Diagnostics
Protocol monitor utilities are available to assist in resolving SCADA commu-
nication difficulties such as incompatible baud rate or addressing. The utilities
can be accessed through the Maintenance Menu Commands, see “Maintenance
Menu Commands” on page 2-11
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