Siemens SIMATIC TIWAY 1 Manual de usuario descargar pdf (Pagina 83)

THE TIWAY I NETWORK PORTS

UNILINK HOST

ADAPTER4–9

USER MANUAL

4.3 TIWAY I HDLC NETWORK PROTOCOL

The TIWAY I network uses the HDLC protocol in the unbalanced, normal

response mode (UNRM) for transmission of commands and responses. In this

mode a single Network Manager (primary) controls the flow of messages

between secondary devices. Information flows between the primary and

secondaries inside HDLC I-Frames or information frames. The destination of

the

frame is specified by the address field, the nature of the frame by the

control

field, and any data specified by the information field. The TIWAY I primitive

requests and responses are encapsulated inside HDLC I-Frames according to

the

format shown in Figure 4–6.

Flag Address Control Information FCS Flag

Figure 4–6 HDLC Frame

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 207 208

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Siemens SIMATIC TIWAY 1 Manual de usuario Pagina 83