Escort 3004B, 3016B, 3008B user manual Syntax of a message unit, Data

15 Ethernet interface

Syntax of a message unit

A message unit (for example: :REAR:SETUP 1) is made of several fields:

- Heading:

For the command messages (for example: :REAR:SETUP 1) or for the interrogation messages (for

example: :REAR ?), it is made of a character chain (simple heading) or of several chains separated with ":" (composed heading).

A chain includes from 1 to 12 alphanumerical characters or the "_" character (code ASCII 95 in decimal). Advisable chain length: 4 characters.

A heading chain always begins with an alphabetic character. It may be preceded by ":" (composed heading) or end with an interrogation point "?" (interrogation message).

An interrogation message must always be followed by the termination sequence.

-Heading separator:

One or several ASCII characters (0 to 32, in decimal except 10 and 13).

-One or several pieces of data:

(for example: :SPEED 1,MM_S), alphanumerical, numerical or made of any characters or binary bytes.

-Data separator:

a comma "," possibly followed and/or preceded by one or several "filling" characters in ASCII code (0 to 32, in decimal except 10 and 13).

Data:

There are several types of pieces of data:

-Alphanumerical data:

1 to 12-character ASCII-coded chains that can be alphabetical (lower or upper case), numerical or the "-" (95d).

The chain must begin with an alphabetical character. For example, for a non-numerical parameter: S1M.

-Decimal digital data:

made of a mantissa and possibly of an exponent, and figured as a succession of ASCII-coded characters that begin with a digit or a sign (+ or -). It can be of NR1 (integer), NR2 (decimal) or NR3 type (with an exponent) or a combination of these three types.

- Text:

7-bit ASCII-coded character chain between quotation marks (") or apostrophes ('). For example: "Channel 1".

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