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This document details the programming of the U232R FTDI USB chip for use in a thermal denuder system controlled by CN7500 Omega controllers. The CBUS0 function is set to TXDEN (transmit enable) and is programmed in the EEPROM for RS485 communication. The utility MProg.exe is utilized to program the EEPROM settings. Different CBUS pins can be configured for various controls, including fan control. Refer to the provided documentation for further details on pin options and programming specifics.
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Nov 14, 2009. revisiting programming U232R FTDI USB chip for Thermal Denuder with CN7500 Omega controllers Blue trace is CBUS0 TXDEN Red is TX “T” character CBUS0 is programmed in EEPROM as TXDEN for RS485 use Use this utility to program EEPROM. D:\John\VS_FTDI_Example\MProg 3.5 Release\MPROG.exe
See D:\John\VS_FTDI_Example\RS485_DS_FT232R_V204.pdf pg 27 TxDEN defaults on CBUS2 Seems I don’t need to use PWREN# (CBUS3) But I have reprogrammed CNUS0 to be TxDEN Use CBUS1, 2, 3 for GPIO, fan control, etc
See D:\John\VS_FTDI_Example\RS485_DS_FT232R_V204.pdf pg 12 for CBUS pin options