test plug rs232 port not respond

[joseponzo]

the communication with my machine (vmc20 cnc88hs) worked correctly, but failure, we done a test plug on rs232 port in 1030 board (PCB-0206 interface) and this it does not respond, i suppose that this damage, that they recommend to me to make now or to prove that damage, appreciate some help.

[gar]

071013-1338 EST USA

joseponzo:

I am not familar with Fadal details.

I believe you are talking about a problem at you CNC machine.

Do you know that your computer is good? Here is a test I posted on another question here.

Following is a self-contained procedure that you can use to check your 
PC hardware for both send and receive.

Assume COM1 is your RS232 port.

Make a connector that will jumper pin 2 to 3. You can also bring a wire 
out from pin 5 and another one from the jumpered 2 and 3. Make pin 5 
black, and pin 2-3 green. Two feet long is good. Call this a loopback 
cable. Do not short black and green together.

Plug the loopback cable into the port to be tested.

In Windows pick
START/PROGRAMS/ACCESSORIES/COMMUNICATION/HYPERTERMINAL

Connection Description should be displayed. If not pick FILE at the top 
left and pick NEW CONNECTION.

Under name enter something like the following with the values you want. 
This is just an identifying name. I do not know the length limit.

DIRECT_COM1_RS232_96_7_1_E_XONXOFF

Select COM1 or whatever your port is.

Now enter your settings. APPLY, OK

Pick TRANSFER and CAPTURE TEXT 

Now you have to specify a subdirectory and filename for the captured 
text to be placed into. Then pick its START.

Next type some characters on the keyboard. These should show on the 
screen. If no characters appear, then you have some sort of problem.

Pick TRANSFER again and pick STOP. Now look at the content of the 
file to which you directed your capture. What you typed should show 
up if the loopback worked.

The black and green pigtail wires are so you can look at the voltage, 
or use the signal.

If you know that the PC RS232 works, then you can connect the these 
wires to send a signal to your CNC, but you can not connect the TxD 
from the CNC to this loopback green wire. With the CNC powered up try 
transmitting data again to your capture file. If the data is correct, then 
the CNC RxD input is not excessively loading the TxD output of the PC.

If you go to
http://www.cnczone.com/forums/showthread.php?t=44526
and look at some of my posts you will find discussions on voltage measurements that may help identify the problem area.

Can you define what the pin connections are in the Fadal loopback test plug?

Also visit my web site
www.beta-a2.com

.

[Shizzlemah]

Gar,
The test he mentions is a fadal-only loopback. TX from the Fadal, RX at the Fadal, verify received = sent.

[gar]

071013-2233 EST USA

Shizzlemah:

Are any other pins jumpered in the Fadal loopback connector other than 2 to 3?

In whatever test is run for loopback at the Fadal does it have a long enough data stream that one could monitor the voltage at 2-3 relative to 7 and get information during transmission with a voltmeter as I have described? Clearly we could measure the rest state voltage both with and without the RxD load.

If the Fadal loopback test fails as I believe has been previously indicated, then it is useful to know if the TxD has failed. If it has not, then very high probability the receiver is bad or something beyond it.

.

[joseponzo]

Originally Posted by gar 071013-2233 EST USA Shizzlemah: Are any other pins jumpered in the Fadal loopback connector other than 2 to 3?

review and you found that this jumped 2 to 3, and the 5 to 6 to 8 to 20

In whatever test is run for loopback at the Fadal does it have a long enough data stream that one could monitor the voltage at 2-3 relative to 7 and get information during transmission with a voltmeter as I have described? Clearly we could measure the rest state voltage both with and without the RxD load.

exists the option of a continuous test, if the port does not respond the control continues sending data. review and the test does not arrive anything from voltage when test

If the Fadal loopback test fails as I believe has been previously indicated, c. If it has not, then very high probability the receiver is bad or something beyond it.

the interphase card this marking an error, does not let blink the indicating red led. we suspected that to the card lost the program



thanks

[Neal]

If the Fadal machine fails the loop back test, then the 1030 card is bad.

Neal

[gar]

071016-1300 EST USA

joseponzo:

The problem may be your RS232 board as Neal has indicated, but what is the problem?

Let us assume that your cable to the PC has at the Fadal end the same pins 5,6, 8, and 20 jumpered together, then when you run the loopback test but before transmitting data is the voltage on 5-6-8-20 a positve voltage relative to pin 7 common, and how much? It should be greater than +5 and probably less than +15. And is it the same while transmitting?

If the 5-6-8-20 voltage is correct, before starting the loop back test what is the voltage on pin 2 relative to pin 7 including polarity which is important? If this reset state voltage is between -5 and -15 V, then run the loop back test in a continuous mode. Now the voltage should jump around in the range of +/-1 V on pin 2 relative to pin 7. Does it? If it does, then the Fadal RS232 transmitter is probably OK and the receiver is failing.

It is possible this board is built with 1488 and 1489 RS232 interface chips. If one or both of these are defective, then you may be able to locally repair the board. It could be that some other interface chip(s) are used.

If Fadal uses an input/output protection circuit on the RS232 leads like HAAS does, then it is possible that an input series resistor has been bvurned up.

Any failure in this area is likely caused by a high voltage being connected to an input or output. Our I232 optical isolator can prevent this type of problem in most cases.

.