Справочник Пользователя для Siemens 500 NIM

 

Network Design Considerations

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.

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)