SATEC SA300 ezPAC Operation Manual - Manual (Page 15)

Chapter 2 Device Description Device Inputs
SA300 Substation Automation Unit 15
Ethernet Port
A 10Base-T Ethernet port provides a direct connection of the SA300 to a local area
network through the TCP/IP protocols. The device has two onboard TCP servers
configured for the Modbus/TCP (at TCP port 502) and DNP3.0/TCP (at TCP port
20000) communications. The TCP servers can support up to 5 simultaneous
connections with Modbus/TCP and DNP3.0/TCP client applications.
Connection through the Ethernet port does not require device identification. The
SA300 responds to any device address and returns the received address in the
response message.
: Note
To provide simultaneous file services for all ports, the SA300 keeps independent file pointers for
each communications port. For a TCP port, the SA300 holds separate file pointers for each
active TCP socket. The TCP server automatically closes a connection if a socket is idle for more
than 5 minutes. There is no guarantee that a new connection is established at the same socket,
so do not make any assumptions regarding the current file status when starting a new
connection from your application. Always initialize a file pointer to a record from where you
expect to begin reading a file. For more information, see “File Transfer” in the SA300 Modbus
Communications Guide.
Using the RDM and RGM
The Remote Display Module (RDM) or Remote Graphical Module (RGM) is
connected to the device’s COM3 port using the RS-485 two-wire connection. The
COM3 port connector has additional isolated 12VDC output terminals to power the
RDM directly from the SA300. For the wiring diagram, refer to the SA300 Installation
Manual. For information on using the RDM, see Chapter 4 “
Using the RDM ”.
The remote display modules communicate with the SA300 using the Modbus RTU
protocol. Both the COM3 port and the RDM/RGM RS-485 port are preset at the
factory to 19200 bps, 8-bits/No-parity, address 1, and run the Modbus RTU protocol.
The baud rate can be increased up to 115200 bps (depending on the
communications quality) through the RDM or service Terminal program.
Using PAS
PAS is the support software supplied with the SA300 that gives the user basic tool for
programming the device, performing remote control operations, monitoring real-time
measurements, retrieving and analyzing historical data files, reviewing fault and
power quality reports, and more.
PAS can communicate with the devices through any SA300 port using the Modbus
RTU, Modbus ASCII and DNP3.0 protocols.
For information on installing and using PAS, see Chapter 6 “ Using PAS ”.
Device Inputs
AC Inputs
The AC voltage and current input terminals are connected to the internal device
circuits through input transformers that isolate the device from external wiring.
Voltage Inputs
The device has four transformer-isolated voltage inputs (direct 690V RMS phase-to-
phase voltage, ×120% overload). Voltage channels are designated as V1 through V4.
The secondary voltage rating and primary to secondary voltage ratio (PT ratio) of the
external potential transformers must be specified in your device to provide correct
voltage measurements. For more information on specifying voltage input ratings in
your device, see
2
Basic Device Setup in Chapter 7.