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  1. #1

    BUFFER OVER FLOW ALARM

    Hi all.
    we have a SL-25MC with MSD-516 control.
    Error "087 buffer over flow " appears when I try to send a long program . The program is also received incompletely.
    but when i try to send a short program its ok .
    Is it possible to change the amount of device memory through parameters?
    This problem did not exist before on the device.
    I made the following settings but the problem was not solved:
    Right-click on "My Computer" icon and select "Manage"
    Select "Device Manager"
    Find the entry "Ports (COM and LPT" and click the + sign to see what's listed under it.
    Right-click on the COM port you are using (COM1?) and select "Properties"
    Click the "Port Settings" tab, then the "Advanced" button.
    Find the left/right slider control for the "Transmit buffer" and move it all the way to the LEFT (lowest setting).
    Thank you very much for your guidance.

  2. #2
    Registered
    Join Date
    Apr 2009
    Posts
    1266

    Re: BUFFER OVER FLOW ALARM

    As a general rule, reduce the BAUD rate on the control and computer.

  3. #3
    Registered
    Join Date
    Apr 2011
    Posts
    800

    Re: BUFFER OVER FLOW ALARM

    Series 16/18/21
    CNC Port1 (JD5A)
    0000 00000010
    20 0
    101 1***0**1 Maybe with Buffer Overflow issues 1***1**1
    102 3
    103 10
    Program Protect 3202 = xxx0xxx0 NE9 & NE8

  4. #4

    Re: BUFFER OVER FLOW ALARM

    Dear drdos
    I investigated this case.
    I took a photo of the device and computer settings. I attached them.
    please guide me.
    thank you.

  5. #5

    Re: BUFFER OVER FLOW ALARM

    Does anyone have a list of Fanuc control parameters?
    List of parameters and their definition.
    thanks a lot

  6. #6

    Re: BUFFER OVER FLOW ALARM

    i really need solve it. pleas guide me.

  7. #7

    Join Date
    Jun 2021
    Posts
    20

    Re: BUFFER OVER FLOW ALARM

    What is your control model? MSD-516 Is not a FANUC control. If you tell me your control model I can tell you what the part number for the parameter manual

    You sent a picture of your I/O settings, are you able to send anything? As others have said, reduce your baud rate. Make sure parameter 20 is 0 and set parameter 101 to 10. This sets the baud rate to 4800 which you’ll also need to set on your PC

    The first thing I would check is to see if there is a “%” at the end of your part program. That percent symbol indicates to the control that the file has ended.

  8. #8

    Re: BUFFER OVER FLOW ALARM

    Dear bumzag
    thank u for reply
    i check '%' in program and its ok. and when i reduce baud rate to 2400 in machine and pc alarm "070 no program space in memory" appeared.
    parameter 0000 : 00001010
    parameter 0001 : 00001110
    parameter 0020 : 0
    parameter 0100 : 00001111
    parameter 0101 : 10000001
    parameter 0101 : 0
    parameter 0103 : 9
    On the computer side, the port settings are as follows.
    baud rate 2400
    data bit 7
    parity even
    stop bit 2
    flow control : hardware

    my control is MSD-516II

  9. #9
    Registered
    Join Date
    Apr 2009
    Posts
    1266

    Re: BUFFER OVER FLOW ALARM

    Take photos of your DIRECTORY:FLOPPY screen in EDIT mode, and SYSTEM CONFIG.

  10. #10
    Registered
    Join Date
    Apr 2009
    Posts
    66

    Re: BUFFER OVER FLOW ALARM

    087 means that the PC did not stop transmitting within 10 characters of being told to stop. The CNC has a buffer. When the buffer is 50% full the CNC will tell the PC to stop transmitting in order to empty the buffer. This is done by sending an X-off command. Your PC is setup for hardware handshaking. Change this to Software handshaking (also known as X-on / X-off). Verify that the CNC can send a program to the PC. If it can't, the PC will never get the command to stop.

    Here is a link to a Youtube video I made regarding RS232 on a Fanuc. It's a little long since it was made for a training class.

    RS232

  11. #11

    Re: BUFFER OVER FLOW ALARM

    Dear Shoprag
    i tested your solution . i changed the flow control to " X-on / X-off " . But the problem was not solved.
    But when I reduce the baud rate to 2400, error 087 does not happen, but error 70 does. " 070 NO PROGRAM SPACE IN MEMORY"
    And the message of sending the full program appears on the computer.
    How can I see the amount of memory on the device?
    Thanks for your tips.

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