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Communications: Appendix – B
B–1
B
Appendix B - Communications
The M-3410A Intertie/Generator Protection Relay
incorporates two serial ports for intelligent, digital
communication with external devices. Equipment
such as RTU's, data concentrators, modems, or
computers can be interfaced for direct, on-line, real
time data acquisition and control.
The M-3810A IPSCom
®
Communication Software
package has been supplied for communication to
any IBM compatible computer running under
Microsoft
®
Windows 95/98/NT/2000.
MODBUS communication protocol is implemented
in the relay. Only RTU mode of the MODBUS
protocol is supported. The following functions are
implemented in IPScom using MODBUS protocol:
•
Real time monitoring of measured
parameters
•
Interrogation and modification of setpoints
•
Downloading of recorded oscillograph data
and sequence of events data
•
Reconfiguration of relay functions
For detailed information on IPScom
communications, refer to
Chapter 4, Operation
.
Communication Ports
The relay includes both front and rear panel serial
COM ports. The front panel port is a 9-pin RS-232
(DB9S) connector configured as DTE (Data Terminal
Equipment) per the EIA-232 standard. The rear port
can be configured as an RS-232 or RS-485 port.
Signals are defined in Table B-1, Communication
Port Signals .
Each communication port may be configured to
operate at any of the standard baud rates (300,
600, 1200, 2400, 4800, 9600, and 19200). The
RS-485 port shares the same baud rate with COM 2
(see Section 2.7,
Circuit Board Switches and
Jumpers
).
While the digital communication ports do include
some ESD (Electrostatic Discharge) protection
circuitry, they are excluded from passing ANSI/
IEEE C37.90.1-1989. Beckwith Electric
recommends the use of RS-232/485 to fiber optic
converters to avoid any question of surge-withstand
capability or ground potential rise.
A null modem cable is also shown in Figure B-1,
Null Modem Cable: M-0423, if direct connection to
a PC (personal computer) is desired.
Summary of Contents for Syncrocloser M-3410A
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