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RS232 Voltage Level to PLC

gerrysc

New member
Hello,
I am considering using a CFA533 connecting to a Micrologix PLC. The specification sheet for the CFA533 indicates it has a full swing RS232 function. I assume that is somewhere between +/- 5V and +/- 12V. Is that correct?

My second question is: The CFA533 will that be suitable, or are there any Crystalfontz devices there would be better connecting to a PLC? I Need the RS232 and a the pushbuttons on the unit.

Thanks,
gerrysc
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CF Tech

Administrator
I am considering using a CFA533 connecting to a Micrologix PLC. The specification sheet for the CFA533 indicates it has a full swing RS232 function. I assume that is somewhere between +/- 5V and +/- 12V. Is that correct?
We use a Sipex (now Exar) SP3220EEA for the RS-232 level translation:
https://www.exar.com/connectivity/transceiver/rs232/sp3220e/

Output Voltage Swing: +/- 5.0 minimum, +/- 5.4 typical
Input Threshold LOW: minimum 0.6 typical 1.2
Input Threshold HIGH: minimum 1.5 typical 2.4​

(ref: https://www.exar.com/common/content/document.ashx?id=631&languageid=1033 )

Note that you can order the Inverted Logic Level version of the CFA533, it exposes the UART pin without the SP3220EEA, so it is 0-3.3v or 0-5v (depending on your power supplied to the CFA-533).

My second question is: The CFA533 will that be suitable, or are there any Crystalfontz devices there would be better connecting to a PLC? I Need the RS232 and a the pushbuttons on the unit.
For RS-232 and buttons, the CFA-533 is an excellent candidate :)

If you wanted 4 lines you could go with the CFA-635.

Thanks,
gerrysc
No problem at all, thank you for considering Crystalfontz. Please do not hesitate to contact us if you have any questions.
 
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