Siemens SIMATIC TIWAY 1 Manual de usuario descargar pdf (Pagina 62)

CONFIGURING THE HOST COMPUTER PORT

UNILINK HOST

ADAPTER 3–4

USER MANUAL

When the synchronous modem operation is selected, the adapter expects the

modem to provide the clocking signals on pins 15 (DB) and 17 (DD). Selecting

synchronous modem operation does not mean that you have selected a

synchronous data link protocol such as the bisynchronous data link protocol.

The

adapter supports two asynchronous data link protocols which are described

further in Paragraph 3.3.

3.2.2

Connection to DTE Equipment

You can also connect a host computer that has a DTE port, such as a

microcomputer, to Port 3 for asynchronous communications by using a null

modem cable. A null modem cable uses 25-pin type “D” connectors and

RS–232–C cable wired as shown in Figure 3–4. Both the adapter and the

attached host see that each is connected to a DCE device. The attaching cable

should

not exceed 50 feet in length. Y

ou may order

this cable from your Siemens

distributor

(P/N;VPU–200–3605).

I002378

Attached

Device

DTE

GND

TxD

RxD

RTS

CTS

DSR

GND

DCD

GND

TxD

RxD

RTS

CTS

DSR

GND

DCD

DTR

UNILINK Host Adapter

DTE

RxCLK–No connection

TxCLK–No connection

Figure 3–4 Cable For Connecting To DTE Equipment (Null

Modem)

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Siemens SIMATIC TIWAY 1 Manual de usuario Pagina 62

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