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LenzeFpiDrv.lib function library

General information about the RS−232C interface

2−1

LenzeFpiDrv.lib EN 1.1

2 General information about the RS−232C interface

RS−232C stands for Recommended Standard−232C, which is an American Standard of the EIA

(Electronic Industries Association). It describes the serial connection between a DTE (Data Terminal

Equipment) and a DCE (Data Communications Equipment) and all the electrical and mechanical

features.

· The RS−232C is often also described by the V.24/V.28, which is the international

recommendation of the CCITT (today knows as ITU − International Telecommunication Union).

The V.24 specifies the mechanical features and the V.28 the electrical features.

Although the standard RS−232C only describes the connection between a DTE and a DCE, the

RS−232C interface has been established as standard for serial data transmission over short

distances.

The following chapters inform about the mechanical and electrical features of the RS−232C interface

and the serial data transmission.

2.1 Mechanical features

2.1.1 Types of plug−in connectors

In general subminiature−D−plug−in connectors in 9 or 25−pole design are used as interface

connectors. They are distinguished as follows:

Master

(e. g. Lenze PLC with FP interface)

Slave

9−pole SubD connector (male)

25−pole SubD socket (female)

9−pole SubD socket (female)

The FP interface requires a connection cable with a 9−pole SubD connector (male).

2.1.2 Terminal assignment with a FP interface

9−pole SubD socket for RS−232C interface

Pin Designation Input/output Explanation

1 − − not used

2 RxD Input Receive data

3 TxD Output Send data

4 DTR Output no function (logic 0")

5 GND − Reference potential

6 DSR Input no function

7 − − not used

8 − − not used

9 + 5V − max. output current 50 mA

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 26 27

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Lenze Global Drive PLC Developer Studio Manual do Utilizador Página 8