Rockwell-automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM Uživatelský manuál stáhnout pdf (Strana 328)

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Publication AG-UM008C-EN-P - February 2005

10-8 Using Dial-up Telephone Communication

Figure 10.5 AHL Instructions Lower and Raise DTR

Peer-to-Peer

Communication

Peer-to-peer communication is the simplest method. Two units

establish a telephone modem link point-to-point using DF1

full-duplex protocol. In this mode, neither unit has control over the

other, but is simply a peer. One of the units sends the command string

to a telephone modem to dial the other unit. Once the communication

has been established, then each unit can send messages back and

forth to exchange data. The unit that initiated the connection normally

hangs up the connection as well.

This configuration is an extension of peer-to-peer communication in

that it involves stations establishing point-to-point telephone modem

links using DF1 full-duplex protocol.

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