How To Read Tlv Tables - Magtek DynaFlex II Go Programmer's Manual

3 - Messages (Requests, Responses, Notifications, and Files)
▪ DF01 = Payload format is for Response Command 0xDF01 - Echo (not TLV)
▪ Tag 81 = Payload Parameter 1, Value to Echo
▪ Length 03
▪ Value 010203 = Value to Echo 010203

3.2.1.3 How to Read TLV Tables

Throughout this document, tables that show TLV data objects use some number of slashes in front of the
Tag identifier to indicate that object's relative level of nesting / containment within other TLV data
objects in the same table. These levels should not be assumed to be absolute levels, because a given TLV
data object may be nested within other TLV data objects at any level. The slash notation saves table
space compared to whitespace indenting, and is easier to read than a separate "Nesting Level" column,
which can be difficult to notice.
For example:
•
Earth contains
•
/North America, which contains
•
//United States, which contains
•
///California.
Although Earth is a relative root within the context of the objects above, it is not an absolute root,
because the nested objects starting with the Earth relative root could be wrapped inside another object
representing Sol Solar System, and that could be wrapped in Milky Way Galaxy, and so on.
In tables that show TLV data objects, a Length of var means the length is variable, and the device or host
must calculate it based on whatever is nested inside the TLV data object.
See Table 3.2-1 below for an example.
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