FTDI CDM Drivers - Revision Comments (English)
Product: AM.CO.ZA Blue USB to Serial COM Converter Cable. No prices.
Local: T:\U\C\Other-Softwares\AM.CO.ZA Blue USB to Serial COM Converter Cable\Windows 98 XP 2000 VISTA 7 2003 2008 SERVER\X32\CDM 2.08.30 WHQL Certified X32\CDM 2 08 30 Release Info.rtf (191954 bytes, MD5 85F1A4C6FBC59C8268E95F51894F338A).
Live: same path under https://cncu.co.za/Other-Softwares/AM.CO.ZA%20Blue%20USB%20to%20Serial%20COM%20Converter%20Cable/ HEAD 200, Content-Length 191954 (2026-08-14T03:05:29Z; re-read 2026-10-19, same MD5).
Copied: T:\V\sources\manuals\usb-serial\CDM 2 08 30 Release Info.rtf
English FTDI Combined Driver Model (CDM) revision-comments handbook. RTF document properties: title FTDI CDM Drivers - Revision Comments May 18, 2006; author/operator Andrew Miller; company FTDI; ~12 pages / ~2483 words. The body heading reads FTDI CDM Drivers 2.08.30 - Revision Comments. Bundled with CDM 2.08.30 WHQL Certified X32 (X64 tree has an MD5-twin RTF, not re-copied). Prefer current Windows 10 installer CDM212364_Setup.exe for new PCs (see USB to Serial software notes); this RTF documents the older 2.08.30 WHQL package.
What the CDM driver is
One FTDI driver package that gives both interfaces on the same cable:
- VCP (Virtual COM Port): the cable shows up as a normal
COMport in Device Manager, which is what machine software (controllers, cutters, RIPs, terminal programs) uses. - D2XX: FTDI's direct USB library (
FTD2XX.DLL) for software written against the FTDI API.
Windows versions covered by 2.08.30
Windows 8 and 8 x64, Windows 7 and 7 x64, Windows Vista and Vista x64, Windows XP and XP x64, Windows Server 2003 / 2003 x64, Server 2008 / 2008 x64 and Server 2008 R2. Windows 10 and newer are not listed in this release; use the newer CDM212364_Setup.exe installer on those PCs.
Files in a standard CDM release
| Group | Files |
|---|---|
| Installation | FTDIBUS.INF, FTDIPORT.INF |
| Drivers | FTDIBUS.SYS (bus driver, 32/64-bit), FTSER2K.SYS (serial/COM port driver, 32/64-bit) |
| D2XX interface | FTD2XX.H; FTD2XX.DLL + FTD2XX.LIB (dynamic, 32/64-bit); static FTD2XX.LIB (32/64-bit) |
| Supporting | FTLang.DLL (property-page languages), FTCSERCO.DLL (co-installer), 32/64-bit each |
Release 2.08.30 (29 July 2013, WHQL certified)
- Fixed remote wakeup for composite devices.
- Fixed wrong bytes-written count reported after a timeout.
- Fixed VCP XON/XOFF (software) flow control.
- Fixed connecting multiple devices to an EUSB adapter.
Recent releases before 2.08.30
| Version | Date | Type | Notable fixes |
|---|---|---|---|
| 2.08.28 | 13 Feb 2013 | WHQL | Close-port bug for .NET Framework apps; close-port problem that made some hubs fail |
| 2.08.26 | 30 Nov 2012 | WHQL | Windows 8 support; faster open/close; COM port unavailable after D2XX access; sync issue that could lose data |
| 2.08.24 | 25 Apr 2012 | WHQL | EEPROM fix for FT-X; rolls up fixes since 2.08.14 |
| 2.08.23 | 7 Feb 2012 | Interim | Spurious data with BM devices |
| 2.08.21 | 25 Jan 2012 | Interim | Data loss when writing right after opening the port |
| 2.08.19 | 14 Dec 2011 | Interim | New FT_EEPROM_Read / FT_EEPROM_Program; read-timeout data integrity; BSOD fixes on surprise removal (hubs, Ethernet USB hosts); slow port open; reliability when other USB devices are plugged/unplugged |
| 2.08.17 | 25 Aug 2011 | Interim | VCP timeout issue; FT232H LED definitions and high baud rates; FT_Purge dropping valid data; faster FT_Close |
| 2.08.14 | 16 Mar 2011 | WHQL | Lock-up or BSOD when buffers are full |
| 2.08.12 | 28 Feb 2011 | Interim | FT232H support; deadlock fix; COM number creeping up on driver upgrade; COM port usable without replug after changing its number |
| 2.08.08 | 16 Nov 2010 | Interim | Hang on COM write timeout; new FT_GetQueueStatusEx; sub-integer baud divisors |
| 2.08.02 | 11 Aug 2010 | WHQL | Faster reads; co-installer can set the starting COM index; FT_GetCOMPortNumber fix; Portuguese |
| 2.06.02 | 31 Mar 2010 | Interim | Vista/7 power management; resume of an open COM port after suspend |
| 2.06.00 | 22 Oct 2009 | WHQL | Hi-speed buffer fixes; XON/XOFF; baud aliasing up to 12 Mbaud; Dutch; UI-language detection |
| 2.04.16 | 17 Feb 2009 | WHQL | Power management; serial-driver protection |
| 2.04.14 | 27 Oct 2008 | WHQL candidate | FT2232H/FT4232H support; blocks EEPROM VID/PID 0x0000; USB 2.0 hub enumeration; Finnish |
| 2.04.06 | 13 Mar 2008 | WHQL | Multilingual property page (FTLang); FT_GetComPortNumber; blue-screen and multi-CPU deadlock fixes; Vista/XP lock-up |
| 2.02.04 | 3 Jul 2007 | WHQL | One driver for 32-bit and 64-bit Windows; write-timeout fixes; Vista fast resume |
| 2.00.00r | 18 May 2006 | WHQL | First combined D2XX + VCP driver model |
Before CDM, FTDI shipped separate VCP drivers numbered 1.00.xxxx (Alpha100, 18 Feb 2000, to 1.00.2176, 12 Dec 2005). Highlights: multiple devices at once (1.00.2067), Windows XP support (1.00.2072), non-standard baud rates and serial printers (1.00.2098), FT232BM/FT245BM (1.00.2112), FT2232C (1.00.2172).
Troubleshooting pointers from the revision notes
- COM port disappears or is "in use" after a program used D2XX: fixed in 2.08.26; update older drivers.
- COM number keeps increasing each time the driver is updated or the cable is moved to another USB port: fixed in 2.08.12. From 2.08.12, a COM number changed on the driver's advanced property page works without unplugging and replugging the cable.
- Blue screen when unplugging the cable while software is open: several surprise-removal fixes from 2.08.12 to 2.08.19, so update older drivers.
- Data loss or garbled data at start of a job: fixes in 2.08.21 and 2.08.26.
- XON/XOFF flow control problems: fixed again in 2.08.30.
- Windows 10 or newer PC: this 2.08.30 package does not list it; use
CDM212364_Setup.exefrom the software notes.
Related
- AM.CO.ZA Blue USB to Serial COM Converter Cable Linux driver install how-to
- USB to Serial software notes
- usb-serial manuals index
Chinese OEM User manual.pdf (FTClean uninstall) skipped. Driver binaries URL-only.