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Feeding serial x2 (WAS:BSI Auto...)
To: CRTech <crtech@crtech.org>
Subject: Feeding serial x2 (WAS:BSI Auto...)
From: Willie Barnett <wbradiolists@gmail.com>
Date: Fri, 15 Dec 2017 11:15:04 -0500
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I remember controlling two B'cast Tools 8x2 switchers with one serial port on the AudioVault system at WFIF. It was what you described... both units "listened only" (in parallel) to one serial port.

My rusty memory (hey, we're talking about stuff I haven't seen/touched in 10 years) ;) recalls that each unit had a 1-character "ID", either "0" or "1" which was programmed into  the serial commands. It worked great once I got all of the command strings set properly in the AV system. The system's other serial port controlled the U4K directly. It "purred like a kitten" until the day I left, about 10 years later. (10 years ago, now!)

You could "cheat" by modifying a couple of cables and disconnecting the TXD line from the devices you're controlling, only using their RXD lines (and ground, of course), to make them "listen-only".

A "normal" cable could be used for programming/troubleshooting one at a time, as needed.

Willie...


On Fri, Dec 15, 2017 at 9:35 AM, Dan Harder <dan@am91.org> wrote:
NOTE: Doing it this way is ugly and may not work. I had several people tell me it wouldn’t, but it did in my circumstance. At the time I was using the ENCO Dad (before windows).

I had one serial port to control two serial devices, so tried splitting the serial cable.

Because the syntax of the commands for the different devices was different, one device ignored the commands of the other. I think I had to begin each command with a carriage return to “clean the cobwebs” of any unknown command before sending, and I think the baud was relatively low, but after experimenting and learning it worked without fail for 4-5 years before the station was sold.

Neither serial device “talked back” to the computer. Just listened.

Good luck.

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