Basler Electric BE1-851 - Manual (Page 243)

SECTION 11 • ASCII COMMAND INTERFACE
Introduction
Relay and power system information can be retrieved from a remote location using the ASCII command
interface. The ASCII command interface is also used to enter settings, retrieve reports and metering
information, and perform control operations. A communication port on the relay front panel provides a
temporary, local interface for communication. Communication ports on the rear panel provide a
permanent communication interface.
Front and rear panel communication ports can be connected to computers, terminals, serial printers,
modems, and intermediate communication/control interfaces such as RS-232 serial multiplexors. BE1-
851 communication 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 computer communication and
transmission of raw oscillographic fault data, if available.
Modbus™ and other common protocols are also available. An instruction manual (9289900992) for using
Modbus protocol with the BE1-851 is available as well as instruction manual (9289900995) for using DNP
protocol. For information about other protocols, consult your Basler Electric Representative.
Serial Port
Communication connections consist of two standard RS-232 ports, one RS-485 port, and one IRIG port.
BE1-851 communication protocol is compatible with readily available modem/terminal software. If
required, password protection provides security against unauthorized operation. Detailed information
about making communication connections is provided in Section 12, Installation.
RS-485 Port
RS-485 terminal block connections are located on the rear panel and designated COM 2. This port
supports half-duplex, multi-drop operation. Multi-drop (polled mode) operation is possible if a polling
address is programmed for the port.
RS-232 Ports
Two female RS-232 (DB-9) connectors are provided. One port is located on the front panel and is
designated COM 0. Another port is located on the rear panel and is designated COM 1. Both ports
support full-duplex operation. Polled operation is possible at the rear port using a simple RS-232 splitter if
a polling address is programmed for COM 1.
ASCII Command Interface
A computer terminal or PC running terminal emulation software can be used at any of the three serial
ports to send commands to the relay. Simple ASCII command language is used to communicate with the
relay. When the relay receives a command, it responds with the appropriate action. ASCII commands can
be used in human machine interactions and in batch download type operations.
Command Structure
An ASCII command consists of a string made up of one or two letters followed by a hyphen and an object
name.
xy-object name
x Specifies the general command function.
y Specifies the command subgroup.
Object Name Defines the specific object to which the command refers.
Examples of object names include 51N (neutral inverse time overcurrent function) and PIA (phase A peak
current demand register). A command string entered alone is a read command. A command string
followed by an equal sign (=) and one or more parameters is a write command.
9289900990 Rev R
BE1-851 ASCII Command Interface 11-1