problem for downloading program using USB to serial converter

Hi all,
I am working on RCM3400 kit. I am trying use PROLIFIC SERIAL TO USB CONVERTER (which is COM5) for downloading the program. While doing that I have set following options.

In project options-> communication

connection type: use serial connection
In serial options

debug baud rate: 9600
max download baud rate:460800
serial port:COM5
stop bits :1
Use USB to serial converter option is checked.


I have also tried different baud rates and another USB port (which is COM6); still it is giving the same error.

When Enable Processor Verification option is checked, it is giving me error as: �WHILE SENDING COLDLOADER NO RABBIT PROCESSOR DETECTED.�

Is there any other setting that I have to do? Could you please suggest me any solution for this problem?

Thank you,


Not all USB to serial cables communicate with Rabbit Products. The one we recommend is from FDTI. We do not guarantee that cables manufactured by prolific with work with our products.

Could you please be more specific about the FTDI cables? For example, could you provide a recommended part number? Also, in another post you mentioned that a USB to RS232 interface cable is available at the company website. Could you please provide a current link? Thank you.

Good afternoon, you can find the converter cable at the following link:

part number 20-151-0178

I hope this helps

Here’s what worked for me:
Windows XP
Rabbit RCM3600
Prolific CP-US-03 USB to RS-232 Serial Converter cable

Install Dynamic C (version 9.62) to C:\DynamicC
…not certain that the simple name (C:\DynamicC ) versus the more typical C:\Program Files\Dynamic C is important, but I do note that the default installation path is not to Program Files.

right-click My Computer and select Properties to expose System Properties dialog
Hardware tab
Click Device Manager button to expose Device Manager dialog
Expand Ports (COM & LPT) branch to see Prolific USB-to-Serial Comm Port (COM1)
Right-click Prolific USB-to-Serial Comm Port (COM1) and select Properties to expose
Prolific USB-to-Serial Comm Port (COM1) Properties dialog
Port Settings tab
Bits per second:19200
Data bits: 8
Parity: None
Stop bits: 1
Flow control: None
Click Advanced button to expose Advanced Settings for COM1 dialog
COM Port Number: COM1
Clisk Apply/OK as necessary to finish and close.

Launch Dynamic C
menu File.Open C:\DynamicC\Samples\PONG.C
menu Options.Project Options to expose Project Options dialog
Communications tab
Connection Type

  • Use Serial Connection
    Serial Options
    Baud Rates
    Debug Baud Rate: 19200
    Max Download Baud Rate: 115200
    _ (unchecked) Disable Baud Negotiation
    Serial Port: COM1
    Stop Bits: 1
    X Enable Processor verification
    X Use USB to Serial Converter
    Targetless tab (TargetLESS?)
    22 MHz, RCM3600, 512K SRAM, 512K Flash
    CPU (revision shown on chip): Rabbit 3000 revision IL2T/IZ2T/UL2T/UZ2T
    Selected Board ID: 0x1E00
    RAM (KBytes): 512
    Primary Flash (KBytes): 512
    Base Frequency (MHz): 11.0592

menu Compile.Compile to Target > Compile to RAM
menu Run.Run
…saw the Pong game working…
menu Run.Stop

I don’t know the answer at the present time, but are the USB010 drivers compatible with Vista ? The error certainly seems to indicate a problem between the Programming Editor and Windows / Driver.