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Author Topic: USB adapters and the Yaesu FT-847  (Read 1204 times)
N1ZZD
Member

Posts: 2




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« on: August 09, 2006, 01:57:53 PM »

I'm trying to interface some software to my Yaesu FT-847 through a USB serial port.
I actually have tried several of these. Two of them use the prolific chipset,
the third is a Belkin.

I can loop two of the adapters  and read back what I thought I sent, so I believe
the software is correct. Parity, stop bits, and data rate are all set correctly.

Despite all that, the radio seems unimpressed.

Although there is one spot in a sequence where the CAT symbol comes on during one
command and goes off with the next (which I don't think should happen),
I am unable to program the radio.

I've also tried to read my GPS with the same USB devices, both with my own software
and with MapPoint's GPS support. What I see with my software is the right number
of characters, with patterns of change that look like NMEA messages, but are gibberish.
MapPoint never reports a coordinate.

Do these things require level converters to work with the 847 and a Garmin 12?

Has anyone successfully used a usb serial port to program an FT-847? If so, which adapter are you using.

-Brian McCarthy, N1ZZD
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AA4PB
Member

Posts: 12800




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« Reply #1 on: August 11, 2006, 05:23:00 AM »

I have no info on the FT-847 but I've interfaced plenty of different GPS receivers to MapPoint and other software using various USB to Serial converters. The only problem I had was with an early Belkin who's driver made WindowsXP crash. Recently I've tried to stick with the FTDI chipset because their drivers are certified by Microsoft for XP.

I know you said the baud rate was correct, but the problem certainly sounds like an improperly set baud rate. Have you tried connecting two computers with a null modem cable and using Hyperterm to transfer text data back and forth?
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AI4NS
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Posts: 320


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« Reply #2 on: August 14, 2006, 02:34:32 PM »

Several people I know have had the best luck with USB-Serial adaptors from Radio Shack. They are cheap, and work very well.

Mike
AI4NS
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N6FM
Member

Posts: 15




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« Reply #3 on: August 19, 2006, 05:32:13 PM »

Did you use a null modem cable? I believe that the 847 requires one, unlike Kenwood which does not.

Ben
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N1ZZD
Member

Posts: 2




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« Reply #4 on: August 24, 2006, 09:27:26 AM »

Yes, I'm using a null modem cable. I've also tried a straight cable.

I'm reasonably certain that the usb adapter is putting out 0 -> +5 signals. A check of the schematics for the FT-847 indicates that there's a MAX-232 chip in front of the CAT input, which indicates that it probably expects +12 signals. I have the components to build a null-modem level converter, haven't finished debugging the cable yet.

-Brian
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W7CNK
Member

Posts: 38




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« Reply #5 on: September 02, 2006, 10:17:37 AM »

Try shorting pins 7 and 8 ( clear to send/request to send) of the USB adapter.  Use a very small wire ( #28/30 ) and wrap it around the male pins of the DB-9 connector on the USB adapter.  Then connect as normal.
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