User Manual

12/06 AWB2724-1584GB

15 RS 232 interface in Transparent mode

In Transparent mode, data is exchanged between the EC4-200

and data terminal devices (e.g. terminals, printers, PCs, measuring

devices) without any interpretation of the data. For this the serial

interface RS 232 (COM1/COM2 = Multifunction interface) must be

switched to Transparent mode via the user program.

Functions for opening and closing the interface, for sending and

receiving data, and for setting the interface parameters are

provided for the running of Transparent mode. After opening, the

interface runs with the current communication parameters that

you can adapt by calling the “SysComSetSettings” function.

The functions of Transparent mode are contained in the library

“EC_SysLibCom.lib”. The library must therefore be included in the

Library Manager. A description of the functions is provided in the

manual “Function Blocks” (AWB2786-1452GB).

COM1/COM2:

The Transparent mode is automatically deactivated when the PLC

state changes to STOP mode or when the “SysComClose” function

is accessed.

Figure: 86: Function overview

Programming via the RS232 interface (COM1) is not

possible if it is in Transparent mode. For this Transparent

mode must first be deactivated. When Transparent mode

is closed, the original communication parameters are

reinitialised.