- Command line missing coolterm serial#
- Command line missing coolterm driver#
- Command line missing coolterm software#
To get around this issue, a FIFO buffer is used. This gets worse the faster the communication speed (in the case of UART, the baud rate). The alternative would be to generate an interrupt for every single character doing so would lead to your CPU doing effectively nothing at all due to interrupt processing overhead while communications are on going. Most USB interfaces will use a FIFO to allow for efficient communication at high speed.
Command line missing coolterm driver#
Your main issue here will be FIFO buffer & driver latency.
Command line missing coolterm serial#
I’ve sent serial messages to read the position, temperature, voltage and current values and the whole process seem to take about 60 ms to complete (for both reading values sent by the motors and to write request commands to the motors). Now that we’ve established the communication speeds, lets dive into the real reason(s) why the transfers with the LSS might actually much slower (or seem to be): As you probably figured out, though, there’s no real way to reduce the processing time on the LSS, so that ~316 µs will stick around no matter the baud rate. In the example above, the orange section would take about 118 µs instead of 510 µs. Of course, running at 500 kbps will reduce transmission time of one character by a factor of about 4.34, which is quite significant. The LSS and LSS Adapter Board were tested at up to 500 kbps with 36 servos on the bus at the same time and the bus completely saturated at 100% with 0 packet loss. Now, if this is your bottleneck, the best you can do is increase the baud rate. The processing time for the QD command inside the LSS was roughly 316 µs (green) and the response time (i.e.: outputting the values physically on the bus) took just a bit over half a ms, or ~510 µs (orange), yielding us a length per character of ~86 µs which falls right in the expected range for communications at 115.2 kbaud rate. read the voltage) to complete at 115200? I’m using the library given at Īs you can see in the image, the total duration of the transaction from when the last character ( \r ) is received in the LSS (from the PC) to when the response is fully transferred for the QD command was about 827 µs (purple). Would you by any chance know how long it would usually take a single read/write process (e.g. How fast is the serial communication is usually at 115200? I’ve sent serial messages to read the position, temperature, voltage and current values and the whole process seem to take about 60 ms to complete (for both reading values sent by the motors and to write request commands to the motors). I have one last question if you don’t mind. Don’t even need to send the carriage return char for that. It was a bit confusing at first but got the job done. I’ve tried the windows powershell, Serial port monitor and Free serial analyzer.
Command line missing coolterm software#
Would you mind letting us know what software you were using? That would probably be quite helpful for other users of the LSS in case this find this answer in the future.
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