Basler Electric BE1-BPR - Manual (Page 129)

9272000990 Rev J BE1-BPR Communications 6-1
SECTION 6 • COMMUNICATIONS
GENERAL
Communications allow the operator to retrieve information about the relay or power system from a remote
location and to request special reports. It also allows the operator to select a specific system protection
scheme or to completely reprogram the relay for a new scheme. A communication port on the front of the
relay provides a temporary, local interface for all communication functions. Rear ports provide a
permanent interface for communications to other areas.
Interface
Communication capability is provided on the relay front and rear panels. The front panel interface mates
with standard RS-232 (DB-9, male) connectors. The rear panel interface uses standard RS-232 (DB-9)
and RS-485 (Terminal Block) connections. The relay communications protocol is compatible with readily
available modem/terminal software. The RS-232 communication ports use the DCE (data circuit-
terminating equipment) type interface and support full duplex operation. The RS-485 communication port
supports half-duplex multi-drop operation. Only one port, front or rear, may be used at a time. The rear
port is the default port, but operation will automatically switch to the front port if a hardware handshake
line (CTS) is asserted. If the rear communication port is active when the front port is enabled, the current
command is completed and the handshake (CTS) line at the rear port will be de-asserted. As soon as
communication ceases, the relay will switch to the front port and assert the front panel handshake line
(RTS). Only one rear port interface (RS-232 or RS-485) may be used at a time.
Applications
The front panel communication port, COM0, is intended for short-term local communication. Hardware
security is provided by a wire seal on the front panel, which limits unauthorized access. Password
protection provides additional security if required.
Rear panel communications ports, COM1A and COM1B, are intended for continuous operation. They
support either RS-232 (COM1A) or RS-485 (COM1B) communications. The RS-485 port (COM1B) and
RS-232 port (COM1A) use the same address so that they can be multi-dropped (polled mode). Although
not intended for multi-dropping, COM1A can be used this way with a RS-232 splitter. COM1A and
COM1B ports are located on physically separate connectors but are internally connected to the same
data stream. The rear panel communication ports have no hardware security other than the mounting
panel enclosure. Password protection provides additional security if required.
Front and rear panel communication ports may be used to interface terminals, computers, serial printers,
modems, and intermediate communication/control interfaces such as RS-232 serial multiplexors. Relay
communications protocols support ASCII and binary data transmissions. ASCII data is used to send and
receive human readable data and commands. Binary data is used for transmission of raw oscillograph
fault data.
BESTview for Windows®
BESTview for Windows is a software application program that enables communication between personal
computers and BE1-BPR relays. Through BESTview, you can retrieve and display COMTRADE
oscillograph fault data, access the front panel from a remote location to change settings, retrieve a
computer file of the relay settings, or send a computer file to the relay to perform all relay settings.
BESTview can be downloaded from
www.basler.com .