7.3
Date Code 20170814
Instruction Manual
SEL-700G Relay
Communications
Communications Interfaces
Hardware Flow Control
All EIA-232 serial ports support RTS/CTS hardware handshaking (hardware
flow control). To enable hardware handshaking, use the SET P command or
front-panel
PORT
submenu to set RTSCTS = Y. Disable hardware handshaking
by setting RTSCTS := N.
➤
If RTSCTS := N, the relay permanently asserts the RTS line.
➤
If RTSCTS := Y, the relay deasserts RTS when it is unable to
receive characters.
➤
If RTSCTS := Y, the relay does not send characters until the
CTS input is asserted.
Fiber-Optic Serial
Port
Use the optional fiber-optic port (Port 2) for safety and communications
distances as far as 1 km. Communications distances as far as 4 km can be
achieved by using an SEL-2812 transceiver on Port 3. While Port 2 and the
SEL-2812 are compatible, Port 2 is less sensitive than the SEL-2812, which
limits the distance to 1 km.
Ethernet Port
Use the Ethernet port for interfacing with an Ethernet network environment.
SEL-700G Ethernet port choices include single or dual copper or fiber-optic
configurations. With dual Ethernet ports, the unit has an unmanaged Ethernet
switch. Redundant configurations support automatic failover switching from
primary to backup network if the relay detects a failure in the primary
network. In addition to failover mode, the unit can operate in a “fixed
connection (to netport) mode” or in a “switched mode” (as an unmanaged
switch).
Figure 7.1 shows an example of a Simple Ethernet Network Configuration,
Figure 7.2 shows an example of an Ethernet Network Configuration with Dual
Redundant Connections, and Figure 7.3 shows an example of an Ethernet
Network Configuration with Ring Structure.
Figure 7.1
Simple Ethernet Network Configuration
CAT 5 shielded twisted pair (STP)
cables with RJ45 connectors
(SEL-C627/C628) for
copper Ethernet ports
OR
Fiber-optic Ethernet cables with
LC connectors (SEL-C808) for
fiber-optic Ethernet ports
Set Port 1 (Ethernet) settings in each relay.
NETWORK
Summary of Contents for SEL-700G Series
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