USB FTDI cable/null modem to SteppIR not talking

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I bought a FTDI USB /Serial cable from Amazon made by Cable creation and one from UGreen. Plugged it into my 6400 and it was reconized by the rig. The SSDR USB setting is thus: cable type CAT,source Active slice, 9600, 8 N 1. Flow control none. Made a null modem cable with pins 2 - 2, 5 - 5 and 7-9 on the Steppir side. Set the Steppir controller (the old original version) to 9600 and rig type Kenwood. After hooking this up it the Steppir does not change frequency when I tune around. Tried both USB FTDI cables and neither work. But when I plug in my original serial cable that goes to my PC and run DDUTIL it does track frequency changes. Tested both USB FTDI cables with my KPA 500 and they both communicate with the rig so the are fine. Also verfied with a multimeter that the serial plugs are soldered correctly.

Any thoughts as to what I am doing wrong?

Zack N8FNR

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Zack Schindler

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Posted 4 months ago

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KENT HUFFORD

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What did you do with pin 3?
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Zack Schindler

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Tried the data out too but no joy.
Tried picking a different Source in the USB Cables setting. Now it says Type Invalid and I can't edit or delete it. Great. Can't believe that this is not working. It is just 4 wires on two connectors.
Put it back on the DDUTIL cable and it tunes just fine but still can't edit the USB Cables setting.
(Edited)
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Frank WA3NHK

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Zack....you said you connected 7 & 9 together on the "controller" side.  Do the same on the connector facing the radio as well.  Also make double sure that your bit rate and parity config are consistent.
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Geoff - AB6BT

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Just curious...why would you connect RTS to RI?
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Frank WA3NHK

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Actually, I had a minor brain burp.  Pins 7 and 9 need to be made common on the steppir controller connector only.  They can remain unconnected at the radio end of the serial cable.  The steppir controller uses them for some sort of TTL-level pass-thru. within the connector  Not entirely sure why, but it's mentioned in a flex PDF regarding the different USB cable options.
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Don N

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The USB Cable manual mentions crossing pins 2 and 3... 2/3 on this end go to 3/2 on that end, as well as the 7/9 connection at the Steppir end.  5 to 5 for ground too, though the manual doesn't say that explicitly.  Looks like the CAT command comes from the Ant Controller, requesting the freq as per the source you setup in the radio, so the serial cable has to have both send and receive circuits in place.

Good Luck, Don
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Frank WA3NHK

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Zack,

Take a look at this thread from earlier this year on this very same subject.  Toward the bottom you'll see my post of the same cable info I've given you.  In this case everything worked fine after he reworked his cable.  Perhaps something else in this thread might be of help.

https://community.flexradio.com/flexradio/topics/usb-interface-and-steppir

Oh, and be sure you're plugged into the "Data In/Radio" port.

73....Frank