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Right now I am having Tablet having OS Android 2.3.3 instead of NFC phone,so I need to connect External card reader to tablet.Please tell me which card reader should I prefer and any driver needed to connect card reader to tablet. The inbuilt NFC libraries support to that reader or not? thanks in advance.
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The built-in NFC library in Android 2.3 and 4.0 only supports the PN544 NFC chip by NXP Semiconductors. I don't think there are any card readers on the market that use it, as this chip is specifically designed for use in mobile devices. You may be able to find alternative implementations of the Android NFC API that support other NFC chips, though.
Another issue may be that your tablet most likely does not have the required NFC libraries installed, including the required system service (NfcManager). After all, your tablet has no NFC support, so it does not need these software components. So a new ROM system image would have to be created for your tablet that includes these software components.
Taking one of the many common desktop readers is probably not really feasible. Creating all the necessary software to integrate it into Android is not really a trivial task. It may be easier to just buy an Android phone with NFC or wait if an Android tablet with NFC comes out.
This is a good topic. I echo RacZo's concerns about NFC library support in the Alibaba sourced tablets. Since NFC chipsets in devices vary and some have dubious or no support for certain operations, you need to be careful and test out your app on those beforehand.
The ACS reader can be a cost effective solution, and there are some mature and well supported libraries and SDKs that support its integration with Android. The downside of the ACS external reader is battery life. Because it monopolizes the the USB port, and Android tablets won't allow charging through a USB port while a peripheral is connected to it. So if your application is some kind of kiosk or self serve app, this may be a problem.
There is a good post here about your various options when faced with this challenge. Without knowing more about your application it's tough to recommend one way or another.