Siemens SIMATIC TIWAY 1 Instrukcja Użytkownika Pobierz pdf (Strona 23)

Network Design Considerations

2-5

SIMATIC TIWAY I Series 500 NIM User Manual

2.2 RS-232-C Cable Installation

The physical layer in TIWAY I provides a modem interface for synchronous

or asynchronous modems at data transmission rates up to 115.2K bits per

second. The modem interface provides standard signals, as defined in

Table 2-1, for control of two-way alternate data transmission using both half

and full duplex modems. The modem interface is a standard “Type E” DTE

configuration as defined in Section 5 of EIA RS-232-C. This interface uses a

male (plug) 25-pin D-type connector on the communication cable. The

circuits and pin assignments for the RS-232-C connector are shown in

Table 2-1.

Table 2-1 RS-232-C Connections

Pin ISO # RS–232-C Name – Function

1 101 AA – Protective Ground (chassis)

2 103 BA – Transmitted Data

3 104 BB – Received Data

4 105 CA – Request to Send (RTS)

5 106 CB – Clear to Send (CTS)

6 107 CC – Data Set Ready (DSR)

7 102 AB – Signal Ground

8 109 CF – Received Line Signal Detector/

Data Carrier Detect (RLSD/DCD)

15 114 DB – Transmitter Signal Element Timing

17 115 DD – Receiver Signal Element Timing

20 108/2 CD – Data Terminal Ready (DTR)

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 137 138

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