Setting up DNC for the first time

[Clyde_06]

Hello, i'm trying to set up a DNC here at our shop. We just built a new computer and we had 2 25 pin RS-232 ports put in through the PCI slots. I downloaded extreme DNC (thats what we used at my old job so it was what i was used to). the only problem is when i try to set up my Haas VF2 it won't do anything. when i try and choose the port it gives me Com1 and Com2. my computer says they're in PCI slots 3 and 4 (PCI Slot 4 (PCI bus 3, device 4, function 0)). how do i get to work? is there a difference between a 25 pin serial cable and a 25 pin rs-232 cable?

[dcoupar]

The "serial" ports (RS-232) should be assigned a COM number. If your PC doesn't have a standard DB9 com port, then the 25 pin ports should be COM1 and COM2. Set your DNC software to use either COM1 or COM2.

Haas only needs 3 wires to send/receive RS232. Your cable might look like this:

CNC <-------------------> PC
1 <------ shield------ no connection to PC
2 <----------------------> 3
3 <----------------------> 2
7 <----------------------> 7

You can't use a straight-thru cable because pins 2 and 3 don't cross. If you have straight-thru cables, I believe you can use them if you get a couple of Null-Modem adapters from Frys or Radio Shack.

[tommyo]

OK

9 pin or 25 pin the signals mean the same:

older 25 pin

pin1 (shield ground) helps aviod noise suggest grounding only
one end of long cables to aviod ground loops

pin 2 TX (talk)
pin 3 RX (listen)
pin 4 RTS (do you mind if we talk)
pin 5 CTS (I'm ready to listen)
pin 6 DSR (this end has something on)
pin 7 signal ground (completes reference circuit)
pin 8 DCD (says the modem has tone)
pin 20 DTR (says the other end has a device on it)


Simplest connection requires:
signal ground connected to both devices 7-7
TX talk to RX listen 2-3
RX listen to TX talk 3-2
jumper CTS and RTS together 4&5
jumper DSR, DTR and DCD together 6&20&8

If you connect RTS to CTS together on each end of the
cable without going through the cable each device lies
to it's self. This used for "hardware handshake" to
pause transmission in large files. Some software use
"software handshake" Xon Xoff or DC codes. (It's
actually control S control Q if typed on a keyboard
to test it)

If you connect DSR to DTR together on each end of the
cable without going through the cable both ends always
think something is there.

Sometimes computers need to believe a modem exists
before software will work. DCD needs to be tied high to
lie for the software. Easiest way is to jumper it to DSR
because it must be there if you are using it.


9 pin connections do not have shield ground. For some
unknown reason they could not even keep TX and RX
signals on the same pins?


Start with a short file. 2400 baud, 7 data bits, even parity

Good Luck

Tom OConnor