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The wikipedia article on ISO8583 tells you about a generic ISO8583 message, but don't stick to that.
Types of data elements i-e alphabets, numeric or special characters mostly depends upon the implementation, for example, some financial institutes want the 'currency code' in numeric (586) but some may require as characters (PKR).
Numeric fields are represented in Hexadecimal whereas character or special characters can be represented either as ASCII or EBCDIC.
Wow, that's horrible English!! First of all, there are many types of ISO 8583 message and it depends on who they belong to as to how they are translated. The 8583 standard is only a general guideline as to what message numbers are used for certain purposes such as 0100 being a balance request and 0110 being a balance response. Many messages are very specialized and it would take hundreds of pages to describe some of the most common message formats. Also, translating the headers and the messages are two different animals. I have seen messages with part of the message in ASCII and part of it in EBCDIC. Those are fun.
Moreover, apart from that the bit map plays vital role getting the field information. If a bit field is set, the corresponding field data will be present and vice versa.
However, the base24 variant of ISO 8583 different in terms of data type. Unlike ISO 8583, in BASE 24 all the data elements are in ASCII hence the packet size is more. But now days the packet size is not much matter of concern in server system, however, it plays a key role in POS transactions where majority of the transaction are still done via PSTN line.
Thanks
Chandan kumar
chandank.kumar@gmail.com
Wiki User
∙ 14y ago
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How does data elements are packed in ISO 8583 message?
== == Hi Koso I am excited work in ISO ...please can you tel me, if you have any ISO manual for VISA, hypercom, MC do you mean how is data formatted or do you mean how do you specifically use "packed" data? e.g. a financial transaction request, let's suppose it has ascii format and the bitmap is binary, I'll represent binary data with 'b' as I can't (or won't) go through the trouble of making an actual binary bitmap: 0200bbbbbbbb165500007891111111003000000000000100 Now the above shows only the start of the message and not a real bitmap, but the format should be clear: the first 4 bytes are the message type, in this case "0200", financial transaction request (a response would be 0210). The next 8 bytes are the binary bitmap (64 bits) that will, if done correctly, show which bits (data elements) are present i.e. have value "1" and not "0". Now in this case I show you 3 following data elements which are present in most requests: cardnumber (2), processing code (3) and transaction amount (4). Data element 2 is cardnumber and has variable length where the length subfield is 2 positions - here you can see it has value "16", which means the next 16 bytes are the cardnumber. Then comes data element 3 which is fixed length 6 positions for the processing code, in this case "003000" which means purchase (first 2 positions "00") using a credit card (positions 3-4 "30"). Then comes data element 4 which is a 12 position fixed length numeric field for the transaction amount, in this case 1 (of whatever currency) because 000000000100 translates to 1.00 currency unit. The currency will be determined in the data element 49 later in the stream, e.g. 840 would be USD. It's like this: the ISO-message roughly exists of 3 things: - message type (MTI) - bitmap(s) - data (elements) The message type can be packed or unpacked and if unpacked, it can be either EBCDIC or ASCII. If it's packed (like with "Hypercom" iso or Visa ISO). each byte contains 2 numbers, if you look at the hex value, which you have to "nibble" to get the expanded value. So if your message type (and other numerical data elements) is packed, the message type is your first 2 bytes instead of your first 4 bytes, after which comes your bitmap. Your bitmap can be either single, double or triple and also can be either hex or binary. A normal Point of Sale message contains a single binary bitmap, i.e. 8 bytes with 64 bits turned on or off. After you figure out which bits are on or off, you start parsing the data elements based on the bitmap data element definition, the fact if they're packed or not (if numeric), they are variable length and if they're alpha numeric, if they're ASCII or EBCDIC. It's complicated but once you make one good routine with your data elements, format all defined in tables, you'll breeze through any type of ISO. I'm programming on a daily basis with Hypercom ISO, Visa, Mastercard, Discover and another 3rd party vendor and they're all a bit different ... Regards, Koos Bezemer Curacao
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