6-6 Settings Date Code 20010518
SEL-2020 Instruction Manual
Table 6.4: SET P Port Communications Settings Information
Setting Comment
DEVICE
Prompt. Device Type (Unused, SEL IED, Other IED, Printer, Master).
Description. You select the device type attached to this port:
Unused if no device is connected.
SEL IED if an SEL relay is connected.
Other IED if another type of SEL device or other vendor’s IED is connected.
Printer if a serial printer is connected.
Master if an RTU, PC, PLC, NIM or ASCII dumb terminal is connected.
CONFIG
Prompt. Auto-configure port (Y/N).
Description. If you say yes, the SEL-2020 determines relay type, model number, metering
capability, port ID, baud rate, passwords, relay elements, and other information necessary
for the SEL-2020 to automatically communicate with SEL relays. The SEL-2020 reports
the results of the auto-configuration once it successfully completes.
Note:
If auto-configuration fails, it may indicate that the connected device is not recognized, that
there is a communication problem between the devices, or that the connected device was
slow to respond. Check for any obvious problems with the connection, then re-attempt
auto-configuration. If auto-configuration still fails, attempt to gain transparent
communications with the device using PORT n. If this does not succeed, there is a
communication problem. If you can connect transparently, but auto-configuration still
fails, there is a probably an incompatibility between the connected device and the
SEL-2020. If this happens, contact the factory for further assistance.
AUTO_BAUD
Prompt: Attempt to detect port baud rate (Y/N).
Description: The SEL-2020 depends on the IED returning a <CR> or <LF> character in
response to a <CR><LF> for baud rate determination to work.
PROTOCOL
Prompt. Communications Type (SEL/LMD/Modbus/DNP for Master, or ASCII/BINARY
for Other IED).
Description. This setting identifies special port communication parameters. For Other
IEDs you may choose between ASCII and BINARY; selecting ASCII allows the normal
ASCII and binary communication; selecting BINARY automatically disables XON/XOFF
handshaking.
If Port 16 DEVICE is set to master, the choices are SEL, LMD, Modbus, and DNP. If Port
12 or 14 DEVICE is master, then the choices are SEL, LMD, and Modbus. For any other
port with DEVICE set to master, the choices are SEL and LMD. Selecting SEL allows the
normal ASCII and binary communications, selecting LMD adds the SEL LMD Protocol,
selecting Modbus disables normal communications and enables Modbus communications
on the selected port, and selecting DNP disables normal communications and enables DNP
communications on the selected port. If you choose LMD, you must select an address and
prefix character and set the settle time. (See Appendix C: LMD Protocol for an
explanation of LMD protocol.) If you choose Modbus, you must select the address for
each port with Modbus data. (See Appendix G: Modbus Protocol for reference
information on Modbus.) If you choose DNP, there are a number of additional settings to
configure the DNP operation. (See Appendix I: DNP V3.00 for reference information on
DNP.)
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