701 Motor Protection Relay Date Code 20010719
ASCII Serial Port Operation
Using Terminal Commands
6.6
Using Terminal Commands
When you type commands at the terminal emulation screen, you can type in either
the entire command or just use the first three letters. For example, the commands
EVENT 1 <ENTER> and EVE 1 <ENTER> both cause the relay to display the most
recent full length event report. You may use upper- and lower-case characters to type in
commands; however, Access Level 2 Password entry is case sensitive. Table 6.4 on
page 6.8 lists all the user commands the relay accepts at the EIA-232 serial ports.
The relay serial ports use software flow control, meaning that character
transmission is controlled by receipt of XON and XOFF characters. When the relay
receives XOFF during transmission, it pauses until it receives an XON character. If
there is no message in progress when the relay receives XOFF, it blocks transmission
of any message presented to its buffer. Messages will be accepted after the relay
receives XON.
You can send control characters from most keyboards using the keystrokes listed
in Table 6.3.
Table 6.3 Seri al Port Control C haracters
You can use the XOFF character to pause in the middle of long transmissions
from the relay, such as event reports and SER reports. To resume the transmission use
the XON character. To cancel a transmission in progress, use the <CNTRL>X
keystrokes.
Table 6.3 Serial Port Control Characters
Control
Characters
Key Commands
Key Command Instructions
XON
<CNTRL>Q
Hold down the Control key and press Q.
XOFF
<CNTRL>S
Hold down the Control key and press S.
CAN
<CNTRL>X
Hold down the Control key and press X.
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