Yes, it did work after I logged out. I amended my instructions. Thanks.

Thanks for the heads up on the chown method not being persistent. I used chown because usermod did not work for me for some reason.

If you're like me you purchased your Optoscan-equipped scanner second hand and didn't get any software or instructions. These instructions are primarily for Linux users. If you're running Windows there is still plenty of helpful information. 1 ) Make sure you have a straight through cable, NOT a …

SUCCESS! I found the original test utility for the Optoscan 456. It is currently running in Dosbox and controlling the radio. Tremendous thanks for the help.

The radio interface is indeed set to 9600. sudo stty -F /dev/ttyS0 9600 sudo stty -F /dev/ttyS0 -a speed 9600 baud; rows 0; columns 0; line = 0; intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = ; eol2 = ; swtch = ; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; …

Optoscan manual says default and recommended baud rate is 9600. I will open the radio to ensure the dip switches are set correctly.

I've been through all those links and many more. Most are dead. The remainder cost money, and out of those the only one I want is Probe, and it works with DOS. My primary objective is to ensure Dosbox "sees" the serial port. If I can get rid of this error 9 thing I think I will be confident enough …

I just purchased a used police scanner with an aftermarket serial port interface. I want to ensure the computer is communicating with the serial port and Dosbox before I fork out $40 for the software to run the radio with the computer. It is a newer computer (core i7), but it has a real RS232 …