18
PARAM
This is a two character, message specific, parameter ID. For a
Read/Write Request or Response message, this ID identifies the
controller parameter. For an Auxiliary Command Request or
Response message, this ID specifies the command.
STATUS
This is a single-character field used in all response messages, con-
taining a status code specifying the status of the request message
received.
DATA
This field contains the ASCII representation of the value of the
parameter. For the Auxiliary Request or Response messages, this
field either contains the ASCII representation of a numeric value or
just ASCII data. The length of this field depends on the message
type. The discussion on the specific message types gives the exact
requirements for this field.
All ASCII representations of numeric values must be done using
the characters ‘0’-‘9’, and ‘.’. Any use of other ASCII characters,
including‘ ‘ and ‘-’ will result in a bad message. Negative numbers
CANNOT be represented by preceding the number with ‘-’ charac-
ter. Instead, a special message type is used. See subsequent sec-
tions for more information.
Digital
Communications
Option
