Why am I experiencing RS232 Buffer overflow errors or CMT Misconnect errors during serial transfer?
Many machines will experience transmission errors if the FIFO buffers are set high on the COM port used to communicate with a machine. Errors can occur when uploading to the machine’s memory, but more often manifest when drip feeding to a machine or when storing or retreiving Mazatrol programs. Mazaks transfering Mazatrol may appear to start transfering correctly but experience communication errors later (CMT mis-connect error). Lower or disable the FIFO buffer on the COM port in question. I personally prefer to set all COM port buffers as low as possible. If you only have a choice of turning them on or off, turn them off. Instructions that follow show how to set the buffers low for COM ports native to a PC or laptop. Most 3rd party hardware require a separate driver and may not have the option to modify this setting. Windows 7 Go to ‘Control Panel’ > ‘System’ Click ‘Device Manager…’ Click ‘Ports (COM & LPT)’ Click the com-port in question, e.g. ‘Communications Port (COM1)’ Click the
