Siemens Simatic S7-400

Initial state of receive line
The following 󹪝gure illustrates the wiring of the receiver at the X27 (RS 422/485) interface:
0 V
0 V
5 V
5 V
R(B) +
R(A) ದ
R(B) +
R(A) ದ
R(B) +
R(A) ದ
R(A) 5 V / R(B) 0 V
R(A) 0 V / R(B) 5 V
none
Figure 5-1 Wiring of the Recipient at the X27 (RS 422/485) Interface (ASCII Driver)
See also
Data Transmission with the ASCII Driver (Page 23)
5.4.4 Con󹪝guration Data of the 3964(R) Procedure
Introduction
Using the parameter assignment data of the 3964(R) procedure, you can adjust the CP 440 to
suit the properties of its communication partner.
Con󹪝guring and Parameter Assignment the CP 440
5.4 Con󹪝guration data
Point-to-point connection CP 440 Installation and Parameter Assignment
Equipment Manual, 03/2022, A5E00057742-AE 63