Tokens - HP TR3271 Programming Manual

ELEMENTS OF SPI MESSAGES FOR THE SUBSYSTEM

Tokens

Tokens
The TR3271 subsystem uses tokens for parameters in commands,
responses to commands, and elements of event messages.
token has a token code and token value associated with it.
token code is an identifying tag that programs refer to by name,
and a token value is a data item that programs also refer to by
name. The token code has two parts:
the data type and length of the token value, and a token number
that uniquely identifies the token for the subsystem.
Types" in this section for a list of the token types used in the
TR3271 subsystem.
The actual token value can be in one of the following forms:
A single field, such as an integer or a character string
A fixed structure
An extensible structure
Tokens that have a token value that is a single field or a
fixed structure are called simple tokens.
token value that is an extensible structure are called extensible
structured tokens.
Simple Tokens
Simple tokens are tokens whose values are single fields or fixed
structures. The token codes for the simple tokens used by the
TR3271 subsystem are represented by symbolic names of the form
Z subsys -TKN- name , where subsys is a three-character subsystem
abbreviation and name identifies the token code.
the token code ZEMS-TKN-LDEV identifies a simple token that
contains a logical device number.
tokens because you do not need a map to decode or build the
structure.
3-8
a token type that specifies
Tokens that have a
For example,
They are considered simple
Each
A
See "Token