TRS3221E: The transmission distance @ baud rate 1152000bps

PYTsai

Genius 11695 points

Part Number: TRS3221E

Can you help check the transmission distance @ baud rate 1152000bps ? thanks!

over 1 year ago

0 Parker Dodson over 1 year ago

TI__Guru 52432 points

HI PYTsai,

None of our RS-232 devices are recommended above 1Mbps - this device is capped at 250kbps. The bit rate you require won't be supported by RS-232.

Is there a typo in bit rate you have provided?

Best,

Parker Dodson

0 Clemens Ladisch over 1 year ago

Guru 317350 points

Assuming you mean 115200 bps, about 1.3 m with standard shielded cables; low-capacitance cables would allow higher distances. See tldp.org/HOWTO/Remote-Serial-Console-HOWTO/serial-distance.html for details.

+1 Parker Dodson over 1 year ago

TI__Guru 52432 points

HI PYTsai,

If you mean 115.2kbps - its going to depend on what package you are using, connectors, and the cable type.

If using RGT package than using CL = 1000pF would be a good place to start for a safe approximation. So if your connectors are 100pF each (2 of them) and the cable you are using has 150pF/m of capacitance then you could support 5.3 meters.

But it is critical to check your own cable parameters - the other link provided in this thread makes way too many assumptions and is outdated w.r.t. RS-232; we have a capacitance budget on this part of 1000pF (it can handle higher loads - up to 2500pF - but the max speed isn't spec'd there)

Please let me know if 115.2kbps is correct.

Best,

Parker Dodson

+1 PYTsai over 1 year ago in reply to Parker Dodson

TI__Genius 11695 points

Thanks for the support it is 115.2kbps.

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TRS3221E: The transmission distance @ baud rate 1152000bps