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Help with faulty rs232 debugging steps

mTeryk

Hot Rolled
Joined
Jul 4, 2010
Location
corvallis,or
I've had my FP2NC with Dialog 4 for quite awhile since I got it from Ross maybe 8 years ag. File transfer has been working fine the whole time. I use DNC4U to transfer files from either my PC with a native com port or a small mini PC using a USB com port. A few months ago I noticed that I couldn't download files from the Deckel to the mini PC and figured it might have been due to a software update. Didn't troubleshoot it as I rarely need to copy programs from the Deckel. After not using the machine for awhile, I went to transfer a program over yesterday and file transfer is totally broken. Can't transfer files to or from using either my PC or the mini PC. There is no error reported. When trying to transfer files to the machine it just waits forever and never appears to see data. When sending data out, it just immediately returns. Don't see it sending any data out.

Nothing about the cable or connectors has changed. Both computers have seen many Windows updates but the settings for the com ports remain the same. I've pulled and reset each board in the control and there is no visible corrosion. I did a hard reset using the K10 jumper and reset my rs232 settings (4800baud, 7 bits,1 stop bit, no parity) and there is no difference.

There are 2 solid red leds on either side of what I believe is the serial connector coming into the NPP54 board. Is that a sign of an error?

Looking for suggestions on what to check next to localize the problem.

Thanks

control boards.jpg
 

Colt45

Hot Rolled
Joined
Nov 27, 2004
Location
SLC, UT
The connector you have circled is for the "PC" in the outboard cabinet. The LEDs on either side indicate good "send/receive" to the PC and should be lit when things are normal. K11 connects to the RS232 port on the bottom of the console (thx Ross).

In my experience, USB-RS232 adaptors can be problematic but I would triple check your RS232 settings on the computer. Check if those settings are available in more than one place on the computer- there is a place in your computer OS as well as your communications program. Sometimes your settings get changed in an update, maybe in a place on the computer you don't expect. Make sure you have the correct "port" designated. Might want to also check your cable, especially that the connectors are still making good contact.
 
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AlfaGTA

Diamond
Joined
Dec 13, 2002
Location
Benicia California USA
Actually i believe that K11 is the connection to the RS232 port and it connects to the NSI board (slot 11)
Think if i am not mistaken K7/8 connect to the MPG.(Dialog4)
Power off the machine (main)
Remove each board from the chassis (one at a time) No need to do the NZP boards (axis boards or the power supply NSV)
Lay each board down on a flat wooden surface and firmly press down on each socketed IC to make sure they are seated.
Thermal changes (on/off) can cause the chips to move in their sockets.....
Restart and try your transfer again.

Cheers Ross
 

mTeryk

Hot Rolled
Joined
Jul 4, 2010
Location
corvallis,or
The connector you have circled is for the "PC" in the outboard cabinet. The LEDs on either side indicate good "send/receive" to the PC and should be lit when things are normal. K11 connects to the RS232 port on the bottom of the console (thx Ross).

Arg! I forgot that PC refers to the high voltage cabinet not the personal computer. Thanks
In my experience, USB-RS232 adaptors can be problematic but I would triple check your RS232 settings on the computer. Check if those settings are available in more than one place on the computer- there is a place in your computer OS as well as your communications program. Sometimes your settings get changed in an update, maybe in a place on the computer you don't expect. Make sure you have the correct "port" designated. Might want to also check your cable, especially that the connectors are still making good contact.

Yep, I know. That is why I initially suspected a driver update on the Mini PC but the fact that it behaves the same with my workstation that has native com ports seems to eliminate that possibility. I have the ports and settings correct in both dnc4u and Device Manager so I highly doubt it is a problem on the computer side of things. Not impossible, though. Thanks for the suggestions.
 

mTeryk

Hot Rolled
Joined
Jul 4, 2010
Location
corvallis,or
Actually i believe that K11 is the connection to the RS232 port and it connects to the NSI board (slot 11)
Think if i am not mistaken K7/8 connect to the MPG.(Dialog4)
Power off the machine (main)
Remove each board from the chassis (one at a time) No need to do the NZP boards (axis boards or the power supply NSV)
Lay each board down on a flat wooden surface and firmly press down on each socketed IC to make sure they are seated.
Thermal changes (on/off) can cause the chips to move in their sockets.....
Restart and try your transfer again.

Cheers Ross

Thanks for the pointer to K11 and the NSI board. That should give me a place to start. I already removed each board and pressed on the socketed ICs. I'll try that again, however.

Thanks
 
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