Siemens SIMATIC TIWAY 1 Manual de usuario descargar pdf (Pagina 182)

USING THE NON-INTELLIGENT TERMINAL PROTOCOL

UNILINK HOST ADAPTER A-6

USER MANUAL

Figure A–2 illustrates how a TIWAY I Primitive is enclosed in the adapter

command

string which is enclosed in the NITP message structure.

Length

Primitive

Code

Descriptor

Field(s)

Data Unit

Field(s)

Command Code

Secondary

Address

Network Data

TIWAY I Primitives

Adapter Data

Check Sum

UNILINK Host Adapter Commands

Message

Character

Count

;

NITP Protocol Message Frame

Figure A–2 Illustrative NITP Message Structure

1 2 ... 177 178 179 180 181 182 183 184 185 186 187 ... 207 208

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Siemens SIMATIC TIWAY 1 Manual de usuario Pagina 182