Ptt & 2; Ports: Foot Switch - microHAM microKEYER Manual

The PTT channels are used to control transmit/receive switching of the transceiver and power amplifier. An
internal sequencer assures 100% protection against hot switching of the PA when the PTT channel is used.
More information about T/R switching and the sequencer is provided under the PTT tab.
Router allows assigning virtual serial ports for PTT using the DTR or RTS signals. DTR* and RTS* are
identical to DTR/RTS except that the output is inhibited for one second after the COM port is opened and .
should only be used with programs that cause unwanted key-ups during startup.
TIP: More applications use RTS for PTT than DTR.
The state of the PTT channel is indicated by a green
arrow. If the port is opened, it does not mean it is
properly configured. When the port is properly
configured, the arrow will light during the entire
transmission. To test PTT operation, click on the Test button with no port assigned or the port closed.
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The 2 PTT channel is identical to the primary PTT channel. 2
application to key the radio if the primary application also controls PTT – for example, a logging program
and CW reader/keyboard.
TIP: Always use serial PTT instead of the radio command PTT or VOX. It is the only way to assure
proper sequencing of a Power Amplifier, LNA or receive antenna switch.
To test PTT, click on the Test button with no port assigned or the port closed.
NOTE: The test buttons do not activate the PTT outputs in VOICE modes.
Even though many applications do not monitor the status of the foot switch and do not have the ability to
perform specific functions based on operation of the foot switch, this capability has been implemented in
Router. Hopefully sometime soon applications will be able to detect the footswitch status and use this this
information to automate user functions as was done in the DOS based TRLog.
Router allows assigning a virtual serial port to the footswitch channel and selecting one of four available
input control lines (CTS, DSR, DCD, or RING). CTS is not available if foot switch is shared with the radio
control port. The state of the signal can be inverted by checking the inverted box.
When a COM port is assigned in Router but the
application does not support foot switch status (or no
application is running), Router reports the channel as
closed.
When foot switch is pressed, this state is indicated by a red arrow.
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PTT & 2 PTT PORTS
FOOT SWITCH PORT
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PTT provides a way for a second