KEPCO BOP-GL 1KW, Руководство оператора

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BOP-1K-GL 111315
3-33
XON/XOFF method of communication is selected as the default to ensure “handshake” control
of serial communication.
The echo mode is an optional method used to ensure reliable communication between the com-
mand originator (computer) and the BOP power supply, thus avoiding a more complex “hand-
shake” protocol. When the BOP is in the RS 232 echo mode it returns all data sent to the host
controller.
The BOP provides an additional option that allow handshake communication: the Prompt
method. By using the handshake options (prompt and XON XOFF) the host controller can
ensure that serial data interrupts occurring after parsing of the incoming message do not result
in lost data.
Figure 3-8 illustrates the echo mode, the prompt method and the default XON XOFF method
described in the following paragraphs.
FIGURE 3-8. RS 232 IMPLEMENTATION
Only seven control characters (characters between 00
H
and 1F
H
) are acknowledged by the
power supply:
• Carriage Return (CR, 0D
H
)
• Line Feed (LF, 0A
H
)
• Back Space (BS, 08
H
)
• Escape (ESC, 01B
H
)
• XON (011
H
)
• XOFF (013
H
)
• CAN (018
H
)
BS deletes the last character entered, with the exception of CR or LF characters. Either the CR
or LF character acts as the line terminator, initiating parsing of the ASCII data sent to the BOP
by the command originator. When the line is parsed and the commands are sent to the analog
processor, the BOP sends the line terminator sequence CR LF to the command originator.
The ESC character is used for synchronization, causing the BOP to reset its input buffer and
return a CR LF sequence.