HP 2624 Manual page 73

Data Communications
RecvPl!lce
Xm1tPl!lce
SRRXm1t
SRRlnvert
BufS1ze
7-10
Table 7-4. Point-to-Point Configuration Menu Fields (Continued)
Reeeive pacing is a mechanism by which ·the terminal automatically controls (halts and resu mes)
the transmission of data from the remote device. There are two means of performing receive
pacing: by manipulating the state of the RS-232C Data Terminal Ready (TR) control line or by using
XON and XOFF control codes.
If this field is set to
"NONE",
then the terminal will NOT perform receive pacing.
HARDWIRED ONLY:
If this field is set to
"TReCD)",
then the terminal will automatically perform receive pacing using the
Data Terminal Ready (TR) control line. With this type of receive pacing, the terminal causes the
remote device to halt transmission by lowering the TR line and to resume transmission by raising
the TR line. For this type of receive pacing to work, the remote device must of course be configured
to start and stop transmission based on the state of the TR control line from the terminal.
FULL DUPLEX ONLY:
If this field is set to
"XonXoff",
then the terminal will automatically perform receive pacing using
XON (ASCII
<DC1»)
and XOFF (ASCII
<DC3»)
control codes. With this type of receive pacing, the
terminal causes the remote device to halt transmission by sending an XOFF code and to resume
transmission by sending an XON code. For this type of receive pacing to work, the remote device
must of course be configured to start and stop transmission in response to XON and XOFF codes.
Note that if the remote device recognizes XON and XOFF codes and your terminal is operating in
character mode, you can issue them through the keyboard regardless of the setting of this field.
The" and
Q
keys (when pressed simultaneously) generate an XON code and the" and
S
keys
generate an XOFF.
Values:
NONE
TReCD)
XonXoff
Transmit pacing is a mechanism by which the remote device can control (stop and resume) the
transmission of data from the terminal.
(
If enabled, transmit pacing is performed using XON and XOFF control codes. When the terminal (
receives an XOFF code (ASCII
<DC3»),
it stops transmitting data. When the terminal subsequently _
receives an XON code (ASCII
<DC1»),
it resumes transmitting data. This should not be used with
DC1/DC2 handshaking.
If this field is set to
"NONE",
the terminal does NOTrecognize the ASCII
<DC1)
and
<DC3)
codes as
XON and XOFF.
For other forms of transmit pacing refer to the descriptions of the SRRXmit and CS(C8)Xmit fields
below.
Values:
NONE
XonXoff
This field specifies whether or not a true state (-12 V) on the RS-232C Secondary Receiver Ready
(SRR) or Secondary Carrier Detect (SCF) control line is a required condition for transmitting data.
This mechanism is primarily used in conjunction with printers which must be able to control the
transmission of data from other devices. The SRRlSCF control line is connected to RS-232C pin
number 12.
Values:
YES
NO
Thisfield applies only when the
SRRXmi t
field is set to
"YES".
When both the
SRRXm1 t
and
SRRlnvert
fields are set to
"YES",
the true state of the RS-232C Secondary Receiver Ready (SRR) or Sec-
ondary Carrier Detect (SCF) control line is inverted from -12 V to +12 V.
Values:
YES
NO
This field specifies the size (in characters) of the receive buffer. The allowable range is 128 to 255.
Note that the space for data comm buffers is taken from display memory. The greater the
BufS1ze,
the less memory is available for display memory. Also note that if you increase the data comm
buffer size when subsequently reconfiguring the port, all of display memory is automatically
reconfigured resulting in the loss of all existing screen data.
Values: Any integer from 128 to 255.
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