[arm-allstar] DMK URI Connection

[Doug Crompton]

 No pullup resistors are needed on the DMK or any FOB as long as it is
connected to a radio. You just need to set the PTT and COS to match your
radio. PTT except in a few rare cases is usually active low which is the
default and COS can be either active high or low depending on the radio. A
few COS examples - Alinico DR13x, TYT are active low, Most 6 pin din
(Yeasu, Icom, etc.) are active high, Baofeng 888 (and others) active high.
If you were to have a radio that needed active high PTT you would need to
add a pullup but as I mentioned this is a rare occurrence.

The FOBS have pullups so if COS is set active high (usb in settings) and
the radio is not connected it will tell Allstar there is an RF connection
coming in just like the node radio RX was receiving a signal. It is always
a good idea to never disconnect the radio from the FOB in any event if you
are connected anywhere.

The V1.5 simpleusb-tune-menu has a (V)iew mode that shows the COS state so
you can easily set it. Virtually allof your troubleshooting can be done
from simpleusb-tune-menu.



*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*

On Sat, Apr 8, 2017 at 8:48 PM, "Maurice Dake via arm-allstar" <
arm-allstar at hamvoip.org> wrote:

> Have a question to those that are using the DMK URI.  Some where I read
> that you need to use pull up resistors on the PTT connection.  My
> transceiver requires a connection to ground for PTT, so I am assuming that
> I need a pull up resistor between +5V line and PTT.
>
> Do I also need a pull up on the COS line?  I will be using a data
> connector SQL line output which go +5V high with squelch open.  Hope this
> makes sense to those that have built a interconnecting cable from URI to
> radio data port.
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