• Auto Detect Serial Baud Rate Software
• Detect Baud Rate Serial Port

Step 1: Select the CNC you want to analyze. Step 2: ProDNC will automatically detect all your PC serial ports. Simply select the COM port you want to use. Step 3: You should now take a guess at the CNC range. (ProDNC will cycle through all ranges, its just quicker if you. Step 4: You should. The Baud rate is the BD setting, with standard baud rates defined as the codes 0 to 7. Use of other codes or support of non-standard baud rates varies by product, so ask Digi sales support for details. XBee for use within a Digi gateway generally should be set to 115200 (code 7), however if it is set for 9600 (default) the gateway will detect. I'm connecting to devices with unknown data streams at odd baud rates (8800, for example). I'm thinking of measuring the period of bits first rec'vd, finding the shortest one and assuming that's the period for the correct baud rate. I need to figure out the proper baud rate after rec'ving one byte and respond correctly to continue the handshakes.

Serial Port Tester is a versatile utility that can be extremely useful in many scenarios involving serial communication and devices. We have demonstrated some popular uses of the tool. You will find it a valuable addition to your software toolbox for identifying issues with serial devices and applications. Automatically Detecting Serial Baud Rate As discussed on the prior page, the transmitter and receiver each needs to be within 2% of the agreed bps/baud rate to ensure accurate serial communication. Usually this means pre-programming or configuring the rate in both devices, and using either an individually compensated oscillator or a crystal.

Auto Detect Serial Baud Rate Software

Comments

Detect Baud Rate Serial Port

• edited 2008-11-29 17:13

  All of the methods for automatic Baud detection rely on some knowledge of the incoming character stream, usually that there are characters coming in with a little time between them so that the start bit can be detected. Usually the characters are odd in value so that the start bit (0) is always followed by a one bit and the width of the start bit is used to set the Baud.
  Your suggestion to measure the width of pulses received and assume that these represent received bits, finding the shortest one and using that for determining the Baud, is reasonable, but don't expect any reliability with arbitrary data streams. I don't think you'll find any better algorithm though. The problem is that the first character that comes along may have no single isolated bits and you'll end up with a Baud that's half or a third of the correct Baud. If there's any noise in the datastream, your Baud detection will be thrown off by that.
  Basically, you've got a bad situation. There is no good solution, but what you suggest will work some of the time. If you can put in a timeout where the whole system resets if synchronization fails and it starts over from the beginning, you at least will have some chance of achieving communications.
• edited 2008-12-12 16:31

  Thanks, Mike for the reply.
  As an aside to dealing with non-standard baud rates, I've found a neat and free terminal program called RealTerm. Works great for diagnosing serial streams.
  realterm.sourceforge.net/
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