RS232 framing error

[gurkirt]

Hi-everyone.

I am using optoNCDT 1401 as a displacement sensor, which give digital optput from 40 to 4055 with RS232 interface.

Bit rate: 38400 Data bits: 8
Parity: none; One Start/Stopbit
Line length: 10 m

but I am not able to get searial data properly.

some time it give framing error and it does not give framing output nver been in correct format.

I am attaching snap shot of my program and output without error.

thanks in advance.

gurkirt

IIT Kanpur

[K C]

Hi,

Be sure the RS-232 settings are OK.

The Framing error source can be a bad connection, wrong RS-232 levels or defective hardware.

[Raj_NI]

Hi Gurkirt,

These links might help you..

http://digital.ni.com/public.nsf/allkb/F3E0621CB71AA16786256F970000FC57?OpenDocument

http://digital.ni.com/public.nsf/allkb/13A20C0F9DF265FB86256FC60066D9C2?OpenDocument

Regards,

Rajshekar P

Applications Engineer

National Instruments

[Henrik_Volkers]

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@K C wrote:

Hi,

Be sure the RS-232 settings are OK.

The Framing error source can be a bad connection, wrong RS-232 levels or defective hardware.

---

Adding a low quality cable , noise / interfearence / groundloops to the cable, or the cable capacity is to high for the driver circuit at this speed. A scope at the PC-RX might give a hint.

Can you make a short connection directly to the unit?

[K C]

Hi Henrik,

Du hast so regt……(so far for my German writing)   

Too bad, there is no further reply from the originator.   

Kees

[gurkirt]

thank you all for replying..

rs232 cable and connection are fine i checked it with other software it works fine with other software but there is allways a problem with labview.

please have look at the snapshots i have attached.

thanks and regards

gurkirt

iit kanpur

[K C]

Hi,

The snapshot only shows a read from the COM port. Can you post the complete program.

With the snapshot you set the com port parameters and read the com port once.