Icom IC-905 - About “USB SEND;Keying”; Protection function

8
OTHER FUNCTIONS
8-2
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-905 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
IC-905 Serial Port A (CI-V)” and “IC-905 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)�
Protection function
The transceiver has a 2 step protection function to
protect the nal power ampliers in case the antenna
SWR becomes high�
The function detects the power amplier temperature
and activates when the temperature becomes too
high�
Power down transmission
Reduces the transmission output power�
• “LMT” is displayed while transmitting�
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 amplier cools down by using the transceiver
only to receive�
• You can check the power amplier temperature with the
TEMP gauge in the Multi-function meter�
TIP: About the “USB SEND/Keying” items
• When you operate RTTY or CW through your PC’s USB
port and your IC-905, 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-905, and connect a second transceiver to another PC
USB port, a short “SEND” or “Keying” signal will be sent
from the rst 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�
USB SEND
USB Keying
(CW)
USB Keying
(RTTY)
[USB] port
TXD
RXD
RTS
DTR
TXD
RXD
RTS
DTR
CPU
Virtual
COM
port A
Virtual
COM
port B
IC-905
Serial Port A
(CI-V)
IC-905
Serial Port B