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The tiway i network ports – Siemens SIMATIC TIWAY 1 User Manual

Page 78

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THE TIWAY I NETWORK PORTS

UNILINK HOST ADAPTER

4-4

USER MANUAL

30

25

20

15

10

8

5

4

3

2

1

6

7

10

50

100

250

Cable Unit Loading (Number of Stations)

19.2 k bps

38.4 k bps

57.6 k bps

115.2 k bps

115.2 k bps or lower

Belden 9860

Belden 9271

Cable Distance (1000’

s of feet)

20

5

I003648

Figure 4–3 Number of Local Line Secondaries vs.

Cable Distance

Signals are coupled between the transmission line and the transmit/receive
circuits to provide a level of rejection to normal AC power frequency
interference and other noise sources. Information is transferred on the TIWAY I
twisted pair media asynchronously at user selectable data rates of 110, 150, 300,
600, 1200, 2400, 4800, 9600, 19.2K, 38.4K, 57.6K, and 115.2K bits per second, in
half-duplex mode and NRZI encoding. The Local Line interface does not support
synchronous operation or NRZ.