Siemens SIMATIC TIWAY 1 Bedienungsanleitung PDF herunterladen (Seite 46)

Installation

3-9

TIWAY 1 Ti505 NIM User Manual

3.3.2.2 Synchronous

/ Asynchr

onous Selection

Network Configuration Parameter switch 5 selects synchronous or asynchronous

operation

for modems.

For synchronous modem communication, the NIM receives the transmit and receive

timing signals from the modem via transmit signal timing element (DB), and receive

signal

timing element (DD). If the modem data rate does not match the TIW

Y data rate

exactly,

the data rate select switches should be set to a rate that is the next lower data

rate

from the modem. For example, if a 56,000 bps synchronous modem is used, a data

rate

of 38,400 bps should be selected on the NIM. T

o select synchronous operation, set the

switch

to the open position (towards the bottom of the dipswitch).

For asynchronous operation, the transmit and receive timing elements are generated

within

the NIM.

Synchronous

operation

is not valid for Local Line operation. When you use the Local Line

medium,

this

switch must be in the asynchronous position (towards the top of the dips

witch,

closed, indicates asynchronous; towards the

bottom of the dipswitch, open, is syn

chronous).

3.3.2.3 Full

/ Half Duplex

Network Configuration Parameter switch 6 selects full or half duplex operation when

communicating over an RS-232-C data link. When half duplex is selected (switch 6 is,

closed, towards the top of the dipswitch) the NIM waits for the Data Carrier Detect

(DCD) control signal from the modem to go inactive before activating the Request To

Send (RTS) control signal. If full duplex operation is selected, the timing relationship

between

DCD and RTS will be ignored.

When the Local Line communication media is used, this switch is ignored since no

externally

supplied communication control signals are supplied.

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