Lenze Global Drive PLC Developer Studio Instrukcja Użytkownika Pobierz pdf (Strona 9)

LenzeFpiDrv.lib function library

General information about the RS−232C interface

2−2

LenzeFpiDrv.lib EN 1.1

2.2 Electrical features

2.2.1 Voltage level

The logical states of the individual bits are sent as voltage states via send or receive cables:

Logical state Voltage level Min. voltage level − sender*

1 −3 ... −15 V −5 V

0 +3 ... +15 V +5 V

* at permissible ohmic load > 3 kW

The achievable distance between two RS−232C devices depends on the cable and baud rate used.

We recommend not to exceed a distance of 15 to 30 meters at a baud rate of 9600 baud.

2.2.2 Baud rate/data transmission rate

The baud rate indicates how many bits are transferred per second. This figure together with the other

transmission parameters (number of stop bits/data bits and parity bit) result in the data transmission

rate which is usually indicated in characters per second.

Transmissionrate +

Baud rate

Total number of bits transmitted per character

Example

Transmissionrate +

9600

1 (start bit) + 8 (data bits) + 1 (parity bit) + 1 (stop bit)

+ 872 characters/s

The following table indicates the data transmission rates possible when using a FP interface for a

transmission with 8 data bits, 1 stop bit and even parity.

Baud rate*

(Bit/s)

Transmission time per character

(ms)

Data transmission rate

(characters/s)

600 18.33 54

1200 9.17 109

2400 4.58 218

4800 2.29 436

9600 1.15 872

19200 0.573 1745

38400 0.286 3490

* With the FP interface every 250 ms a character can be sent, therefore a baud rate higher than 38400 baud cannot be recommended.

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Lenze Global Drive PLC Developer Studio Instrukcja Użytkownika Strona 9