I was going at it from the other direction trying to identify which ttyS is assigned to the physical port I am connecting to.

I came up with many answers that gave hardware addresses (bus and device id's) but not which ttyS* that chirp is using to connect.

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From: Jim Unroe
To: Rick Begeman ; Discussion of CHIRP <chirp_users@intrepid.danplanet.com>
Sent: Thursday, September 28, 2017 2:16 AM
Subject: Re: [chirp_users] Connecting to my radio

On Wed, Sep 27, 2017 at 11:39 PM, Rick Begeman via chirp_users
<chirp_users@intrepid.danplanet.com> wrote:
>

See "serial port permissions" on the "Running CHIRP Under Linux" page.

http://chirp.danplanet.com/projects/chirp/wiki/Running_Under_Linux

Jim KC9HI