Measure data using RS-485 Port on cFP-2120

I have cFP-2120 with one RS-485 Port, One RS-422 and one RS-232 Port available, i want to measure data using the exisiting RS-485 Port on cFP-2120.
I have Rx and Tx Signals from my equipment. Two wire
Also i have RS-485 Enabled device with 4 port availble. I want to use RS-485 connected with RJ-50.
Also give me pinouts for Rx and Tx.
Thanks.

I am a little confused by your statement "I have cFP-2120 with one RS-485 Port, One RS-422 and one RS-232 Port available". The cFP-2120 has 3 RS-232 ports and only 1 RS-485 (or RS-422).
Look in the manual for the cFP-2120. Here is a link. http://www.ni.com/pdf/manuals/371380b.pdf Pages 3-7 thru 3-10 have information and pinouts for the serial ports. It also tells how the RS-485 port is a 4-wire port, but it can connect to a 2-wire RS-485 installation with jumpers and special programming to account for the echo back of outgoing commands. Another alternative to 4-wire to 2-wire conversion is to get an RS-485 isolator that would have switches to set one side to 4-wire and the other side to 2-wire. I have used this one from B&B electronics successfully. Though you say you are using 4-wire on your device, so you would not need it unless you have the need for electrical isolation between the device and your cFP. Perhaps the discussion of 2-wire was a misunderstanding.
Remember that the transmit lines from your device will go to the receive lines of your cFP and vice versa. The polarity of + and - should match between the two devices. TX+ to RX+, TX- to RX-, RX+ to TX+, RX- to TX-, and GND to GND)
As for VISA, you would just configure it like you would any RS-232 device with the baud rate, parity, and stop bits to match your device.
Centerbolt, thanks for the kind words and posting the link to the other thread.

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National Instruments Engineers: Please help identify / fix this problem and give us a Time frame for when the problem can be fixed!
LabView 8.2 Installed Components on cFP 2120:
http://objective.no/gostemp/cFP_Components_LV_8-2.jpg
LabView 8.2 cFP 2120 cPU Load:
http://objective.no/gostemp/cFP_LV_8-2_CPU_Load.jpg
LabView 8.5 Installed Components on cFP 2120:
http://objective.no/gostemp/cFP_Components_LV_8-5.jpg
LabView 8.5 cFP 2120 cPU Load:
http://objective.no/gostemp/cFP_LV_8-5_CPU_Load.jpg
regards
Geir Ove Skjærvik
Objective Technology
Norway
Geir Ove

Hello,
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Download the test from this link: http://objective.no/gostemp/lv_8_5_probleml.zip
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>
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Attachments:
Modbus Communication RS 485(8.2).vi ‏31 KB
RS 485 to 232 Converter Front View.JPG ‏12 KB
MODBUS-RS485-STD.pdf ‏128 KB

If you have a 32bit Floating point number (Single Precision) in your register than you must read to U16 number, concanate them by using the "join Numbers.vi and then typecast them into a Single Precisio. See the image Below for more detailed information.
I'm not sure if you are still having problems with this if you are please re post and we will be glad to help you
thanks
Regards,
CharlesD
Digital MultimetersSchedule a Free 1 Hour LabVIEW Tutorial with an NI Applications Engineer

Measure data using RS-485 Port on cFP-2120

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