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9-1
9� OTHER FUNCTIONS
About “USB SEND/Keying”
You can control transmit, receive, and CW/RTTY
keying from the PC through the USB port.
Select the control port to be used for
communication between the transceiver and PC
in “USB SEND,” “USB Keying (CW),” and “USB
Keying (RTTY)” according to your operating needs.
» SET > Connectors >
USB SEND/Keying
The IC-705 has two virtual COM ports, A and B.
The transmit and receive control (USB SEND),
CW Keying, or RTTY (FSK) Keying signals from
the PC are assigned to the DTR/RTS terminals in
the virtual port.
L
When connecting to a USB port on your PC that is
installed the USB driver, USB (A) and USB (B) are
named as “IC-705 Serial Port A (CI-V)” and “IC-705
Serial Port B.”
USB SEND
(Default: OFF)
USB Keying (CW)
(Default: OFF)
USB Keying (RTTY)
(Default: OFF)
•OFF:
Turns OFF the function.
• USB (A) DTR: Uses the DTR terminal on USB (A).
• USB (A) RTS: Uses the RTS terminal on USB (A).
• USB (B) DTR: Uses the DTR terminal on USB (B).
• USB (B) RTS: Uses the RTS terminal on USB (B).
USB SEND
USB Keying
(CW)
USB Keying
(RTTY)
[microUSB]
port
TXD
RXD
RTS
DTR
TXD
RXD
RTS
DTR
CPU
Virtual
COM
port A
Virtual
COM
port B
IC-705
Serial Port A
(CI-V)
IC-705
Serial Port B
TIP: About the “USB SEND/Keying” items
• When you operate RTTY or CW through your PC’s
USB port and your IC-705, you may not be able
to send the “SEND” or “Keying” signals until a few
seconds after you connect the USB cable.
• When you operate through your PC’s USB port
and the IC-705, and connect a second transceiver
to another PC USB port, a short “SEND”
or “Keying” signal will be sent from the first
transceiver. Therefore, we recommend that you do
not connect a second transceiver to a USB port of
the same PC. Or, always turn OFF the transceiver
power before you connect a USB cable.
Protection function
The transceiver has a 2 step protection function
to protect the final power amplifiers in case the
antenna SWR becomes high.
The function detects the power amplifier
temperature and activates when the temperature
becomes too high.
Power down transmission
Reduces the transmission output power.
TX inhibit
Disables the transmitter.
•
(Grayed out) is displayed instead of
while
the transmitter is disabled.
NOTE:
If the function is activated, wait until
the power amplifier cools down by using the
transceiver only to receive.
• You can check the power amplifier temperature
with the TEMP gauge in the Multi-function meter.