FTDI Community

Please login or register.

Login with username, password and session length.
Advanced Search  

News:

Welcome to the FTDI Community!

Please read our Welcome Note

Technical Support enquires
please contact the team
@ FTDI Support


New Bridgetek Community is now open

Please note that we have created the Bridgetek Community to discuss all Bridgetek products e.g. EVE, MCU.

Please follow this link and create a new user account to get started.

Bridgetek Community

Author Topic: FT2232HQ adds extra one byte  (Read 19637 times)

mnecetinkaya

  • Newbie
  • *
  • Posts: 1
    • View Profile
FT2232HQ adds extra one byte
« on: March 21, 2024, 01:18:18 pm »

Hi everyone,

I have a problem like I mention in title shortly. I designed a board to communicate between pc and a device which use RS485. I can communicate but every time receive a data it comes with a FE or FF byte as prefix. I'm using FT2232HQ with ADM3485EARZ-REEL7 on my board. Then I used USB-COM485-PLUS2 and I compared the waveform of the two converters. Even though the waveforms are same, I did not receive any extra byte while using USB-COM485-PLUS2. I wonder if I get schematic of COM485-PLUS2? Or does anyone have an idea about that situation?
Logged

FTDI Community

  • Administrator
  • Hero Member
  • *****
  • Posts: 906
    • View Profile
Re: FT2232HQ adds extra one byte
« Reply #1 on: March 21, 2024, 03:32:52 pm »

Hello,

The extra bytes may be due to lack of biasing on the RS485 transceiver. If you could email into support1@ftdichip.com we can share the RS485 biasing schematic that will be able to help you.

Best Regards
FTDI Community 
Logged