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These are the default settings for the port. Which is to say, that if a program doesn't configure the
port before opening, these are the setting that will be in place at boot time. Since every program I
have ever seen, sets the COM port parameters, this screen is meaningless. It is useful because of
the "Advanced" button, which clicking on it will permit you to change the COM port number.
Interfacing to older CI-V devices
The CI-V Router pulls up the bus with a 4.7K ohm resistor, supplying only one milliamp of current
for the input of any device. For "modern" CMOS inputs, this is more than enough current to pull
up the capacitance for long cables. If you have a device with an older, higher input current logic,
such as TTL, the pull up resistor should be dropped. Look at the schematic in the CIV Router
Board and pick one output to be the high current output, and change either R1, R2 or R3 from 4.7K
to 1K ohm.
http://k9jm.com/CIV_Router/CIV%20Router%20Board.pdf
The CI-V router can pull well over 100ma to ground, so it can easily handle the extra current.
Icom does not specify the loading of the CI-V bus, but in general each node on the bus should pull
up at least enough to provide it's own input current.
Deleting COM Ports in Windows
There are many PC programs that limit the number of COM Ports one can have in your system.
When you install the drivers, your computer will assign the COM port number which is next
available in your machine. If you are like me, over time the next available COM port will quickly
become COM 223. Most of them are COM ports for things that I no longer have or use. Here is
how to delete unused COM ports from your computer.
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