Specifications

PTT Switching
By default, TRX-manager uses a CAT command for RX/TX switching and you don't have to
configure PTT switching!
However, if this CAT function is not supported (IC-706MKIIG is a typical case), PTT Line
switching is possible via the RTS or DTR line of a serial port (CAT or CW Port). In addition
TRX-Manager provides a way to read the state of the transceiver's PTT line by using the DSR
or CTS line of same serial serial port (TX Interrupt option).
What is the use of these functions ?
The PTT switching feature allows you, if necessary, to separately switch the PTT of a
transceiver which does not support the corresponding CAT command. Moreover, in the case
of use of preamplifiers or linear amplifiers, it can be preferable to have a separate switching
circuit so relays can be transferred before actual transmission is started.
You have to wire an interface (see CW interface for some diagrams).
The TX interrupt (advanced) feature makes it possible for the program to detect a manual
switch into TX and thus to stop certain functions such as a CW sequence or a loop (in
connection with Voice Keyer Express).
PTT Time Out option (all rigs)
From Preferences, under Transceiver tab, a PTT Time Out option is available (after a
specified delay in seconds).
PTT switching
Under the Parameters/Setup/TRX1 tab, PTT frame, you have different options to control
TX/RX switching:

CAT (default) is usually checked if the RX/TX command is supported by the CAT/RS232
protocol of your transceiver (please see its manual). This option sets TX/RX by direct CAT
control,

if DTR (or RTS ) if checked, the program sends the TX/RX signal to the DTR (or RTS) line
of the transceiver's serial port. In that case, you have to disable the corresponding line of
the RS-232 interface under the Transceiver frame (see notes) to make these options
available,

CW if checked, the program sends the TX/RX signal to the unused line of the CW
interface's serial port (i.e : if you key CW via DTR, RTS will be the PTT line...). Of course,
if you key CW via the transceiver's serial port, this option is not available...
Notes

Generally RTS and DTR lines are not required by the RS232 protocol to control the transceiver
but you may have the following cases : (1) One line may be required to power ON the
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