Tech Support Request - Serial baud rade changes

One of my goals for the forum was to provide a source of information sharing and tech support, so, with that, we have our first tech support style question!

From Jim, W6JVE:

Some of us in the amateur radio game would like to be able to use the serial port on the computer at 45.45 baud, 5 bits per character so we can send and receive 60 wpm RTTY signals through the port. That is not one of the supported baud rates. I don't know where to go to ask that this be changed.

So, is this something that can be done easily? Programatically? Can you help Jim out? If so, post a response! And thanks!

Thanks for sharing the Serial

Andrew321's picture

Thanks for sharing the Serial port information. The .NET Framework V2.0 and higher include the SerialPort class for accessing COM ports, including USB Virtual COM Ports?


Serial port information

Jim Haynes's picture

Thanks, I'll try it. 50 baud isn't close enough, but I'm sure 45.44 is.

Serial Port Information

K5TUX's picture


Using the Linux stty utility, it is possible to make changes to serial port settings that can closely emulate a RTTY port. Try the following command:

linux> stty 50 cs5 cstopb -F /dev/ttySx

Substitute the proper serial port number for x, where the first port is 0 and so on. The previous command will set your serial port speed to 50 baud with 5 data bits and two stop bits. This is not exactly 45.45 as required by RTTY and may result in high error rates. Using the setserial utility, you can make a tweak to this configuration:

linux> setserial /dev/ttySx baud_base 115200 divisor 2535

This will bring the baud rate of the serial port to 45.44, resulting in about a 0.1% error rate. This may or may not be good enough for your purposes. There are companies that make serial port UARTs that properly handle 45.45 baud, but the standard 16450 or 16550A in your PC is only going to get close.

You might find some more information to help you out here:

Hope this helps.

73 de Russ, K5TUX

One Click, Universal Protection: Implementing Centralized Security Policies on Linux Systems

As Linux continues to play an ever increasing role in corporate data centers and institutions, ensuring the integrity and protection of these systems must be a priority. With 60% of the world's websites and an increasing share of organization's mission-critical workloads running on Linux, failing to stop malware and other advanced threats on Linux can increasingly impact an organization's reputation and bottom line.

Learn More

Sponsored by Bit9

Linux Backup and Recovery Webinar

Most companies incorporate backup procedures for critical data, which can be restored quickly if a loss occurs. However, fewer companies are prepared for catastrophic system failures, in which they lose all data, the entire operating system, applications, settings, patches and more, reducing their system(s) to “bare metal.” After all, before data can be restored to a system, there must be a system to restore it to.

In this one hour webinar, learn how to enhance your existing backup strategies for better disaster recovery preparedness using Storix System Backup Administrator (SBAdmin), a highly flexible bare-metal recovery solution for UNIX and Linux systems.

Learn More

Sponsored by Storix