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1 local line interface, The tiway i network ports – Siemens SIMATIC TIWAY 1 User Manual

Page 76

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THE TIWAY I NETWORK PORTS

UNILINK HOST ADAPTER

4-2

USER MANUAL

4.1.1

Local Line Interface

Port 1

Port 2

Port 3

Port 4

Local Line Interface Ports

I/O

12345

Figure 4–1

Local Line Interface Ports

The Local Line interface to TIWAY I is a female 9-pin “D” connector shown as
Ports 1 and 2 in Figure 4–1. Port 1 is the primary network port. Port 2 provides
support for redundant media transmission when Ports 1 and 2 are connected to
a redundant twisted pair cable network (discussed further in Paragraph 4.2 ).
The pin assignments for these ports are given in Table 4–2.

Table 4–2

Local Line Connector Pin Assignments

Pin

1
2
3
4
5
6
7
8
9

Name

Sheild

LLM+

LLM–

Description

Reserved
Reserved
Cable shield and signal common
Reserved
Reserved
Positive biased signal line
Reserved
Reserved
Negative biased signal line