AEG 381 D Specifications download pdf (Page 63)

D3.2 Programming cable PCS 733

PC - PCS Connection

D3.3 Data transfer PCS - PLC

The data traffic with the controller is made in data packages. Each data package

is provided with a checksum. The contents of the checksum is examined for possible

faults by the programmable controller operating system and by the PCS. In

addition, each read and write cycle is provided with a continuous order number.

The PCS is the master during communication. It has the task of establishing the

communication and of sending orders to the programmable controller. PCS and

programmable controller communicate asynchronously via the serial interface (RS

232). Adjustable transmission baud rates are 19200 and/or 9600. 8 data bits are

fixed pre-defined, ODD parity, 1 stop bit for communication via the programming

unit interface.

Only the interchange of data packages is described in this manual.

Structure of the reading cycle:

PCS PROGRAMMABLE CONTROLLER

READ N BYTES →

← ANSWER N BYTES

...

(REPETITION CORRESPONDING TO THE DATA FIELD)

...

READ N BYTES →

← ANSWER N BYTES

Communication

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AEG 381 D Specifications Page 63