More DNC problems

[WayneHill]

Originally Posted by Donkey Hotey Nope, not on mine. It was a straight DB25-DB9, without a Null Modem adapter. It worked fine. That was the debate we had in the other thread. One guy is running null modem adapters on his machines and yet, mine worked without it. I'm just not sure why. JNC: have you tried just doing serial file transfer yet? Launch Hyperterminal and see if the Haas can send the current program back to the PC. That's what I did to test things. It was working at 19200 (didn't try any more).

Your wire must be a crossover cable. Easy to verify.

[gar]

071229-1358 EST USA

In software handshake mode you only need three wires and no other pins jumpered for communication. These are:

PC 9 Pin -- HAAS 25 Pin
2 ---------- 2
3 ---------- 3
5 ---------- 7

If the cable is shielded, then
NC -SHIELD- 1

Some software on the PC might require other pins to be jumpered. HyperTerminal and Cimco do not require any jumpers in software handshake (XON/XOFF).

I do not have a demonstratable reason to either connect or not connect HAAS pin 1 to 7, so my suggestion is to not make this connection. I have an analytical reason to not connect, but this may not be very important. HAAS has a 100 ohm resistor in series with each of their used pins except pin 1. Note the only pins HAAS uses are 1, 2, 3, 4, 5, 7. The pins 6, 8, and 20 are simply jumpered together and go nowhere and do nothing.

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[WayneHill]

I have a very logical reason to connect 1 and 7 together, communication does not work without doing it. It does not make any sense to me either. All I know is, the Haas mills are communicating with the network and everybody is happy.

[gar]

071229-1937 EST USA

Wayne:

You have a good reason if it works one way and not the other.

HAAS machines with brushless servos are very noisy. When you connect pin 1 on the HAAS to pin 5 on the PC you have a direct connection from the HAAS machine chassis to the PC chassis. There is no need for the connection to pin 7 in this case.

Since there is a 100 ohm resistor between the HAAS pin 7 and HAAS chassis and the power supply common it is possible that this is introducing a common mode noise voltage into the RS232 common path between HAAS and the computer.

The only problem with direct connection of the two chassis is if there is a short between 240 or 120 and a chassis there will be a current flow thru the interconnect cable that may burn up at least part of the cable and probably other components. Ideally you would like to burn up the 100 ohm resistors and nothing else. But the 100 ohm resistors are not a good solution to the problem and won't be totally effective. The best way is with electrical isolation in the communication path.

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[jnc]

AHA! SUCCESS!
I used Waynes pin info and it worked......even with my own crappy solder job!
The Mill is cutting right now.


Thanks guys!

[jnc]

here she is

[WayneHill]

Originally Posted by jnc AHA! SUCCESS! I used Waynes pin info and it worked......even with my own crappy solder job! The Mill is cutting right now. Thanks guys!

Great
A db hood can hide the solder work.

Okay. Now that it is working, try unhooking the #1 pin on the Haas side and post the results if it works without the #1 wire connected.

[gar]

071231-1937 EST USA

I think, based on this information from more than one source, that the HAAS 100 ohm resistor in series with the common line, pin 7, is the source of the problem in combination with the high HAAS ground path noise level. Thus, you can make your wiring simpler by using pin 1 as signal common, and ignore pin 7 at the CNC.

Then your only problem will be any possible large ground currents or voltages.

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[cpc_it]

I know this is an old thread but Thanks Guys esp Wayne Gar and OP info was very helpful.

I used 2-2 3-3 5-7 and 7-5, with no jumpers. Kind of a cross between Wayne's and Gar's advice, and now a laptop with a USB/Serial device is communicating with a troublesome HAAS.

[hoi.le]

Originally Posted by WayneHill There should be a 9 pin male port that is the serial port. The other port is probably the video port. The cable connector for Haas Mills PC DB9 .............Haas Mill DB25 -------------------------------- 2---------------------2 3---------------------3 8---------------------4 7---------------------5 5----------|----------7 ................|----------1 1-4-6 ................6-8-20 Make a cable up and report back.

Hi everybody,

This is my diagram, have a little difference with Wayne Hill's diagram

PC DB9 --- Haas DB25
2----------------2
3----------------3
4----------------6,8
5----------------7
6,1--------------20
7----------------5
8----------------4

I tried, and succeed for VF-OE

good luck!

[gm3211]

The null modem cabble will work. Any computer store should be able to supply it. Once this cable is in place, then make sure the settings are the same on the PC and CNC. Send from the control back to the PC 1st and confirm data is received.

If the cable is too short, we do sell cables up to 200 ft long for machines. We had one guy run 200 ft with DNC, at 38,400 no issues.