Prerequisites For Operation In Ascii Mode - Siemens SIMATIC S5 CP 521 Manual

ASCII Mode
7.2

Prerequisites for Operation in ASCII Mode

The following conditions must be met for operating the CP 521:
1. Settings on the peripheral device
The settings on the peripheral device must agree with the parameter setting data
on the CP 521. If, for example, your peripheral device is transmitting data at 2400
baud, you must also set this baud rate in the CP 521.
Note:
• See 3.5.2 for configuration examples with terminal diagrams.
• See 2.3.2 for details of the serial interface.
• Setting the CP 521 parameters in ASCII mode is explained in 7.3.
2. Setting the CP 521 parameters
There are various ways of setting the CP 521 parameters:
• Transfer the parameter setting data in the user program. No memory
submodule is required.
• Transfer the parameter setting data using the "FORCE VAR" programmer
function. No memory submodule is required.
• Store the parameter setting data in a memory submodule in DB 1.
Initialize the memory submodule using a programmer in offline mode.
You must specify the following parameter setting data:
• Parameters for the interface to the peripheral device (baud rate, type of
interface, handshake mode ...)
The parameters must agree with the specifications and settings on the
peripheral device.
7-2
CP 521
GWA 4NEB 812 6030-02b