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CP 523 Technical Description

2.3 Serial Interface CP - Peripheral Device

The CP 523 is equipped with an RS-232-C (V.24) interface and a TTY interface. You can set the serial

interface parameters in two ways:

• In the user program with job number 90

"Set interface parameters" parameter block

( 7.3.2).

The CP 523 copies the parameter setting data from the submodule into a RAM area on the CP

during startup. If the CPU transfers new parameter setting data to the CP during operation,

the CP continues with the new data.

• In data block 1, parameter block 0, on the user submodule (Print mode 6.3.1,

Communications mode 7.3.1).

Data is transferred between the CP and the peripheral device in a 10-bit or 11-bit character frame.

Three data formats are available for each character frame.

10-Bit-character frame

• 1 start bit, 7 data bits, 2 stop bits (data format 3 in parameter block 0)

• 1 start bit, 7 data bits, 1 parity bit, 1 stop bit (data format 4 in parameter block 0)

• 1 start bit, 8 data bits, 1 stop bit (data format 5 in parameter block 0)

11-Bit-character frame

• 1 start bit, 7 data bits, 1 parity bit, 2 stop bits (data format 0 in parameter block 0)

• 1 start bit, 8 data bits, 1 parity bit, 1 stop bit (data format 1 in parameter block 0)

• 1 start bit, 8 data bits, 2 stop bits (data format 2 in parameter block 0)

Figure 2-3. 10-Bit Character Frame with 7 Data Bits, 1 Parity Bit and 1 Stop Bit

Bit no.:

1st example:

Character frame: 10-bit

Data format: 7 data bits (1 start bit, 7 data bits, 1 parity bit, 1 stop bit)

1 2 3 4 5 6 7 8 9 10

1 start

bit

1 pari-

ty bit

1 stop

bit

7 data bits

EWA 4NEB 811 6044-02a

2-5

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 256 257

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Siemens KS7 Series Spezifikationen Seite 19