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USER'S GUIDE
COMMAND
CANLINE
CANPAC
DELETE
PASS
REDISPLA
START, STOP
XOFF, XON
5.2.1.2.
Display Control in Command Mode
The following commands affect display features which are active in the Command
Mode. See the detailed descriptions of these commands in the "Command Summary"
chapter.
COMMAND
ALFDISP
BKONDEL
ECHO
FLOW
LCOK
NUCR
NULF
NULLS
ACRDISP
5.3.
Flow Control
Whenever data are transferred between computers or terminals the data may be received
faster than the receiving system can handle it. Some programs try to deal with this by pro-
viding data buffers for storing incoming data until the program is ready for it. However, this
merely postpones the problem; all buffers have size limitations.
To prevent loss of data, the computer controls data flow by telling the other device to stop
sending data until the computer can empty its buffer. When the computer's buffer has been
flushed and is available again, the computer tells the other device to resume sending data.
If you use a personal computer you're probably already familiar with flow control that allows
you to stop the output from the computer while you read the data and restart the output
when you are ready for more.
5.3.1.
Type-in Flow Control
Type-in flow control (set by the FLOW command) is a display feature. When
ON
, your PK-232 cannot interrupt you with incoming packets while typing a command
word or an outgoing packet.
As soon as you type the first character of a word (except for echoing your typing) your
PK-232 "holds" output towards the computer. This "hold" remains in effect until you type
<CR>
to end the command, or a send-packet character to mark the end of a packet, or
until you erase or re-display the line you've started.
PK232UG Rev. B 9/86
DESCRIPTION
Cancel current line
Cancel packet output
Delete character with destructive backspace
Insert after special character
Re-display current typed line
Computer flow control characters (sent to PK-232)
PK-232 flow control characters (sent to computer
DESCRIPTION
Add <LF> after <CR> in data sent to terminal
Echo after character deletion
Automatic echo of serial port input
Type-in flow control
Lower case translation
Nulls after <CR>
Nulls after <LF>
Null count
Automatic <CR> insertion after
5-2
ADVANCED PACKET OPERATION
n
characters
FLOW
is set
93
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