7.2
SEL-700G Relay
Instruction Manual
Date Code 20170814
Communications
Communications Interfaces
Be sure to evaluate the installation and communications necessary to integrate
with existing devices before ordering your SEL-700G. For example, consider
the fiber-optic interface in noisy installations or for large communications
distances. Following is general information on possible applications of the
different interfaces.
Serial (EIA-232 and
EIA-485) Port
Use the EIA-232 port for communications distances of as far as 15 m (50 feet)
in low noise environments. Use the optional EIA-485 port for communications
distances as far as 1200 m (4000 feet) maximum distance (to achieve this
performance, ensure proper line termination at the receiver).
To connect a PC serial port to the relay front-panel serial port and enter relay
commands, you need the following:
➤
A personal computer equipped with one available EIA-232 serial
port
➤
A communications cable to connect the computer serial port to
the relay serial ports
➤
Terminal emulation software to control the computer serial port
➤
An SEL-700G Relay
Some of the SEL devices available for integration or communication system
robustness are included in the following list:
➤
SEL Communications Processors (SEL-2032, SEL-2030,
SEL-2020)
➤
SEL-2800 series fiber-optic transceivers
➤
SEL-2890 Ethernet Transceiver
➤
SEL-3010 Event Messenger
➤
SEL-2505 Remote I/O Module (with SEL-2812 compatible ST
option only for fiber-optic link to Port 2)
A variety of terminal emulation programs on personal computers can
communicate with the relay. For the best display, use VT-100 terminal
emulation or the closest variation.
The default settings for all EIA-232 serial ports are listed below:
➤
Data Rate = 9600
➤
Data Bits = 8
➤
Parity = N
➤
Stop Bits = 1
To change the port settings, use the SET P command (see Section 6: Settings)
or the front panel. Section 8: Front-Panel Operations provides details on
making settings with the front panel.
Содержание SEL-700G Series
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