Timewave DSP-232, Operating Manual

Page: 59 / 271

Chapter 4 Terminal Interfacing
UBIT is an extension of the CUSTOM command which allows up to 255 ON | OFF functions to be added to the
DSP without burdening you with a large number of extra commands. The functions controlled by
UBIT
aren’t
things that you’ll most likely change—still, they’re important enough to some users or application programs that we
have included them under the umbrella command of
UBIT
.
The following are examples of how to use the
UBIT
:
UBIT 5 Shows the present status of UBIT 5
UBIT 1 O N
Sets the function controlled by
UBIT 1
to
ON
UBIT 10 T Toggles the state of the function controlled by UBIT 10
UBIT
Returns the state of the last
UBIT
value that was accessed
Listed below are the terminal relevant
UBIT functions and the default state that presently have been assigned. The
default state of each
UBIT
is shown first. Others are listed in Appendix C.
UBIT 2
:
ON
: A Break signal received on the RS-232 line forces the DSP into Command mode
from all the modes except Host mode.
OFF
: A Break signal on the RS-232 line is ignored by the DSP.
UBIT 5
:
OFF
: The DSP will always power up in Command mode.
ON
: The DSP will remain in the last mode (Converse, Command or Transparent)
provided the battery jumper enabled.
UBIT 14 : OFF : In packet, the transmit buffer for data sent from the computer to the DSP is limited
only by the available DSP memory.
ON : In packet, the serial flow control will permit only a maximum of seven I-frames to
be held by the DSP before transmission. This solves a problem with the YAPP
binary file transfer program which relies on a small TNC transmit buffer to operate
correctly.
XFlow ON | OFF Default: ON
Host: XW
ON
XON/XOFF (software) flow control is activated.
OFF XON/XOFF flow control is deactivated - hardware flow control is enabled.
With
XFLOW ON , software flow control is in effect—it’s assumed that the computer will respond to the DSP’s
Start and Stop characters defined by the XON and XOFF commands. Similarly, the DSP will respond to the
computers start and stop characters defined by
START
and
STOP
.
With
XFLOW OFF
, the DSP sends hardware flow control commands by way of the CTS line and is controlled by
either the RTS or the DTR line.
XMITOk ON
|
OFF
Default: ON
Host: X0
ON Transmit functions (PTT line) are active.
OFF
Transmit functions (PTT line) are diabled.
When XMITOK is OFF, the PTT lines to your transmitter on both Radio Ports are disabled - the transmit function
in inhibited. All other DSP-232 functions remain the same. Your DSP generates anmd sends packets as requested,
but does not key the radio’s PTT line.
Use the XMITOK command to ensure that your DSP does not transmit.
Turning XMITOK OFF can be used to enable full break-in CW operation (QSK) on certain transceivers.
4-26 September, 05