Date Code 20080110 SEL-300 Series Relays Firmware Upgrade Instructions B-3
SEL-387E Instruction Manual
B. Establish a Terminal Connection
To establish communication between the relay and a personal computer, you must be able to
modify the computer serial communications parameters (i.e., data transmission rate, data bits,
parity) and set the file transfer protocol to 1K Xmodem or Xmodem protocol.
Step 1. Connect a serial communications cable to the computer serial port.
a. Check the computer for a label identifying the serial communications ports.
b. Choose a port and connect an SEL Cable C234A (or equivalent) serial
communications cable to the personal computer serial port.
If there is no identification label, connect the cable to any computer serial port. Note
that you might later change this computer serial port to a different port in order to
establish communication between the relay and the computer.
Step 2. Disconnect any other serial port connection(s).
Step 3. From the computer, open HyperTerminal.
On a personal computer running Windows, you would typically click Start >
Programs > Accessories.
Step 4. Enter a name, select any icon, and click OK (
Figure B.1).
Figure B.1: Establishing a Connection
Step 5. Select the computer serial port you are using to communicate with the relay
(
Figure B.2) and click OK. This port matches the port connection that you made in
Step 1 under B. Establish a Terminal Connection.
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