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7.10
SEL-787 Relay
Instruction Manual
Date Code 20081022
Communications
SEL ASCII Protocol and Commands
SEL ASCII Protocol and Commands
Message Format
SEL ASCII protocol is designed for manual and automatic communication.
All commands the relay receives must be of the following form:
<command><CR> or <command><CRLF>
A command transmitted to the relay consists of the command followed by
either a CR (carriage return) or a CRLF (carriage return and line feed). You
can truncate commands to the first three characters. For example,
EVENT 1
<Enter>
becomes
EVE 1 <Enter>
. Use upper- and lowercase characters
without distinction, except in passwords.
The relay transmits all messages in the following format:
<STX><MESSAGE LINE 1><CRLF>
<MESSAGE LINE 2><CRLF>
•
•
•
<LAST MESSAGE LINE><CRLF><ETX>
Each message begins with the start-of-transmission character (ASCII 02) and
ends with the end-of-transmission character (ASCII 03). Each line of the
message ends with a carriage return and line feed.
Software
Flow Control
The relay implements XON/XOFF flow control. You can use the XON/XOFF
protocol to control the relay during data transmission. 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 the relay input buffer. Messages will
be accepted after the relay receives XON.
The relay transmits XON (ASCII hex 11) and asserts the RTS output (if
hardware handshaking is enabled) when the relay input buffer drops below
25 percent full.
The relay transmits XOFF (ASCII hex 13) when the buffer is more than
75 percent full. If hardware handshaking is enabled, the relay deasserts the
RTS output when the buffer is approximately 95 percent full. Automatic
transmission sources should monitor for the XOFF character to avoid
overwriting the buffer. Transmission should terminate at the end of the
message in progress when XOFF is received and can resume when the relay
sends XON.
The CAN character (ASCII hex 18) aborts a pending transmission. This is
useful for terminating an unwanted transmission. You can send control
characters from most keyboards with the following keystrokes:
➤
XOFF
: <Ctrl+S>
(hold down the
<Ctrl>
key and press
S
)
➤
XON:
<Ctrl+Q>
(hold down the
<Ctrl>
key and press
Q
)
➤
CAN:
<Ctrl+X>
(hold down the
<Ctrl>
key and press
X
)
Automatic Messages
When the serial port AUTO setting is Y, the relay sends automatic messages to
indicate specific conditions.
lists these messages.
NOTE:
The
<Enter>
key on most
keyboards is configured to send the
ASCII character 13 (
<Ctrl+M>
) for a
carriage return. This manual instructs
you to press the
<Enter>
key after
commands to send the proper ASCII
code to the SEL-787.
Summary of Contents for SEL-787
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