Serial Communication

[K C]

OK Cole it's getting better with every step

I assume that the voltages are on the pins 2 on the PC and 3 on the cable ?

Is this a cable special for the instrument or ?

Can you tell where i can find a manual or something like that of your temperature controller.

[JohnGalt]

You are correct, sir. Testing the cable connected to the computer, I get voltages on pins 2 and 3. It is not a special instrument cable. Just your basic serial cable. The manual can be hard to find, since the instrument has a communications manualand a user's manual. You probably wan tcommunications, the harder one to find. I think this is it at http://www.newportus.com/Pdf/M3397CN.pdf check it out.

[K C]

Hi Cole,

I have the manual. On page 7 (11 in PDF) Figure 3.3 there is a drawing of the connection between more instruments. Is this your situation one or more instruments with RS485 interface on one bus connected to a converter RS485 <--> RS232 ??

[JohnGalt]

No, it is the only device connected to this port. What I have is a PCI card that puts out 8 different ports in a card. It is connected to one of those ports, with several other devices connected to the rest of the ports, some left empty, of course. So the problem may be the card, although it's manufacturer guarantees me there is nothing wrong with it. I have the drivers for it as well. I have no idea why it wouldn't work.

[K C]

I am a bit lost now. Are you talking about your com ports on your PC or are you referring to the Newport controller. ( I think the first one)

[JohnGalt]

I only have one COM port on my PC, the rest I suppose are also technically on my PC, but they run through a DAQ card on a PCI board in my computer. I am talking about the Meilhaus ports, which are the ones that are on the PCI card.

Message Edited by JohnGalt on 10-27-2005 01:57 PM

[K C]

You said the COM port is working with a loopback connector. But the Newport Iserie controller is not working on your COM port.

The Meilhaus ports is another, second, problem.

I'm right so far ?

Do you also have a link for the manual of the Meilhaus ports ?

[JohnGalt]

Yes, correct, but it is an Omega controller, not Newport. That is why I was confused. I can looki up the manual, I will link it below.

http://www.icsdatacom.com/pdfs/ME9100_ds.pdf

This should get you what you need. I will make sure to look it over too, make sure there is nothing I missed.

[JohnGalt]

Sorry, found a better manual. http://www.meilhaus.com/download/manuals/english/me9x00_e.pdf

[K C]

Hi Cole,

Your PCI controller ( the first problem). To be sure:

It is a RS232 and not a RS485 controller ?

You also measured the voltage at pin 2 and 3. No voltage ?

Is this controller visible in your windows system hardware list ?

Is the flow control for these com ports set to 'none' ? 

Your temperature controller (second problem):

The COM port on your PC works with the loopback connector. But you got no data from your temperature controller. Correct ? Do you have a manual for this controller?