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4.5.1.3 X
ONjX
OFF
If
the X ON
IX
OFF feature is enabled
and the terminal's communications line
buffer (FIFO) approaches the full state, the
terminal will transmit a DC3 code (hexa-
decimal 13) to the host. The host, as a
result, should stop sending data. As the termi-
nal continues to process characters out of
the buffer, and thus begins to approach
the empty state, the terminal will signal the
host by transmitting a DC1 code (hexa-
decimal 11) to resume data transmission.
The terminal will recognize a DC3 and DC1
code from the host and respond similarly
if the terminal is transmitting in Text mode.
Note that a DC3 will lock the terminal and
the keyboard.
If
this feature is disabled, the
terminal will not generate or recognize DC3
or DC1 codes.
Pressing the SET UP key will send a
DC3, if this feature is enabled. Then, press-
ing the SET UP (or SAVE) key again will
send a DC1 (see subsection 4.4.5 on
unlocking the keyboard).
4-3
4.5.1.4 Baud Rates
Anyone of the following communica-
tions speeds can be selected for the main
port:
19200
9600
4800
2400
1800
1200
4.5.2 Auxiliary Port
600
300
In addition to the main communications
port, the VIP7201 terminal has an auxiliary
port, which also uses a limited EIA RS-232C
or RS-422A voltage interface to allow attach-
ment to local peripherals. This port also has
the X ON/X OFF feature (refer to subsection
4.5.1.3).
4.5.3
Screen Data to Printer
The Aux Port will control the printer
when dumping data from the screen, i.e.
CR,
LF, and 9 DEL codes after each line
(called TTY). The Aux Port will support
ASPI Protocol for the screen dump.
CP91-00A
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