2-2 General Description Date Code 20010518
SEL-2020 Instruction Manual
the parsed data can be collected from each port’s data region to reduce the processing burden
for downstream devices.
INTELLIGENT PORT SWITCH
You can configure the SEL-2020 as a port switch simply by using the SET P command to
activate and configure each port that has a device connected. Port F on the front and Port 8 on
the rear panel are configured as Master ports at the factory, so you can connect your PC or
terminal to either of these to communicate with the SEL-2020. The default communication
parameters for Port F are 2400 baud, 8 data bits, 1 stop bit, and no parity. For Port 8, the default
is 9600 baud, 8 data bits, 2 stop bits, and no parity.
Once you have configured each port using the SET P command, you can enter transparent com-
munication with the device on any port using the PORT n command, where n is the number of
the port. To quit transparent communication, simply use the default disconnect sequence,
<CTRL-D>, by holding down the Control key and pressing D on your keyboard.
The following features make the SEL-2020 a very intelligent port switch.
Sixteen EIA-232 Rear Ports and One EIA-232 Front Port
Front and rear ports provide connection space for numerous types of devices, including SEL
relays, other types of IEDs, PCs, printers, modems, and even other SEL-2020s. You can inde-
pendently configure each port of the SEL-2020 to match the communication parameters of the
attached device. All communication parameters are software settable. Baud rates can be set up
to 38400 baud.
Multi-Tasking/Multi-User Operating System
The powerful SEL-2020 operating system allows operations to occur on all ports simultaneously.
This capability allows multiple users to communicate with, or through, the SEL-2020 at the same
time; other functions, like printing and modem dial-out, can also be occurring on different ports.
In addition, on ports connected to SEL relays that support Fast Meter data collection, the
SEL-2020 continues to collect meter data while the port is being used for normal ASCII
operation: either ASCII data collection or transparent operation.
Who’s Who Port Directory
The WHO command provides you with a list of all of the ports, the type of relay or device con-
nected to each port, the current communication parameters, and a Port ID string that describes
the device or application. The device type and Port ID string are entered automatically during
the auto-configuration process when the connected device is an SEL relay.
Multi-Level Password Security
Passwords are required to gain access to the various communication levels of the SEL-2020.
One level allows interrogation of settings and data only. Access to a second level is required to
change settings.
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