Strange IDN? returned string

[tian66]

Hello All,

I am using LabVIEW 2012 to control Chroma 63600 Electronics Load through Ethernet. The whole system has worked for half of year and several weeks ago, it stopped working.

I have tried using NI MAX to send *IDN?\N to the Electronics, but the following returend string is innormal. I have replaced a new ethernet card but the problem is still there.

1: Write Operation (*IDN?\n)

Return Count: 6 bytes

2: Read Operation
Return Count: 11 bytes

\xFF\xFD\x03\xFF\xFB\x03\xFF\xFB\x01\r\n

3: Write Operation (*IDN?\n)

Return Count: 6 bytes

4: Read Operation
Return Count: 14 bytes

login: *IDN?\r\n

5: Write Operation (*IDN?\n)

Return Count: 6 bytes

6: Read Operation
Return Count: 12 bytes

password: \r\n

7: Write Operation (*IDN?\n)

Return Count: 6 bytes

8: Read Operation
Return Count: 17 bytes

Login incorrect\r\n

i have another Chroma Power supply and the IDN? returend string is:

1: Write Operation (*IDN?\n)

Return Count: 6 bytes

2: Read Operation
Return Count: 32 bytes

CHROMA,62006P-30-80,00286,03.00\n

Thank you for your help!

[PhillipBrooks]

I would try connecting an RS232 cable and performing the query.

If the results are also garbled (as you've seen on the Ethernet interface) then you would need to contact Chroma support.

[tian66]

thank you for your answear.

RS232 is not avaliable on the electronics load. but I tried a USB connection and the problem is gone.

I have contaced Chroma but they still cannot figure out this problem. 

We have two electronic loads with two ethernet cards and both of them have the same problem, so I do think there is something wrong with the hardware. Besides,  if the ethernet card is down, I donot  think instrument can send back any message for IDN?\n.

thanks!

[bwv1043]

It looks like it's booting up differently.  It want you to login.  I don't have any experience with Chroma products but I would find out if there is a login and password procedure in their user manual.  Login name "admin" with no password is a common default login so maybe you'd want to try that.

Also, this is a very small possibility but maybe you're communicating with wrong device such as a network switch or a router in your network?

[billko]

---

@bwv1043 wrote:

It looks like it's booting up differently.  It want you to login.  I don't have any experience with Chroma products but I would find out if there is a login and password procedure in their user manual.  Login name "admin" with no password is a common default login so maybe you'd want to try that.

Also, this is a very small possibility but maybe you're communicating with wrong device such as a network switch or a router in your network?

---

I think it is possibility #2.

Sounds like he is addressing the wrong isntrument.

[JÞB]

The question I would ask is if the load reciently went to the cal lab.  (Often devices get left in a calibration mode that requires a login)

The other question you should be asking Chroma is why they don't have their user manuals on-line (but they wuold sell me a set for 50 USD!  )

[tian66]

I am sure the connection is correct. Since I have matched the IP address showing both on the instrument and the MAX.

[tian66]

Please refer to my latest the following reply.

Thanks!

[tian66]

I can control the load through USB. Do you think the cal mode will lock ethernet communication, but not USB?

Thanks!

[bwv1043]

Is there anything else connected to the same network?  Is it possible that another device has the same address as the Chroma load?

If not, then maybe the login prompt is for low level access to Chroma firmware.