Transmit Buffer Full-No Response from Controller

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bradders
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Transmit Buffer Full-No Response from Controller

Post by bradders » Thu 02 Mar , 2006 11:22 am

I get the error message “TRANSMIT BUFFER FULL” or "No Response from controller" when running VR Milling Ver2.** (or version 5) with a NextMove ST (the ones with the Green seven segment LED displays - later ones have USB interface)

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Post by bradders » Thu 02 Mar , 2006 11:25 am

A. Down load EASY UPGRADER.ZIP from www.denford.co.uk Technical Support and run it on the PC connected to the Machine Tool

A. If it is Transmit Buffer full, then you cannot change the COM settings apart from the baud rate - 57600 is the minimum for NextMove ST controller.
The latest firmware and version of VR milling will get rid of any buffer full errors - as long as the PC hardware is good. eg, if you are using a laptop, then this will cause very slow communications. we would recommend a desktop PC with a quality serial port (or go to USB NextMove)

Note ? Easy Upgrader information

CPLD :- USB = Ver 4 None USB Ver 9
FPGA :- 5216 (Rev A & B boards will not accept 5216)
Note ? Quickcam pro needs 5216 to work
Firmware :- Ver 17 (Some boards will only take Ver 14)
Note ? Quickcam pro needs Ver 17 to work

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Steve
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Post by Steve » Thu 02 Mar , 2006 14:32 pm

Transmit Buffer full will only occurs on machines with RS 232 communication. The message indicates that the communication between the PC and machine have failed and after repeated tries to communicate without reply the communication buffer is full.

This alarm can be caused by several things.
Electrical noise crashing the PC com port. This may be a static discharge, a noisey electrical supply or piece of equipment being operated nearby.

On older machines when E-stop is pressed the control card power is disconnected this leaves the computer trying to communicate with a machine that is not energised.

Ensure you disconnect the machine interface before you turn off the machine.

Once a transmit buffer full has occured you should power off the computer and machine then restart both before using the machine again.

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Steve
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Static Discharge from Vacuum

Post by Steve » Wed 29 Mar , 2006 2:38 am

We have found that on several machines that have encountered a TRANSMIT BUFFER FULL alarm that this only happens when the machine is cutting and the vacuum is running. The dust going down the vacuum hose creates static and a discharge can cause the machine communications to crash.

In the UK this has been resolved on Compacts by placing an earth clip on the vacuum unit and also earthing the aluminium pipe where the hose exits the cabinet.

If you experience the problem try cutting parts without the vacuum to prove this is the problem. If you contact Denford we will provide a kit to earth both the Vacuum (if it was supplied by Denford UK) and a clip to earth the exhaust pipe.

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