Siemens SIMATIC TI525 Hardware And Installation Manual page 58

If you are powering up a TI535 for the first time, turn off the
battery backup. This ensures that the TI535 PLC is properly
initialized. Refer to the startup procedure in Chapter 5.
6. Enable power.
Pin
2
3
4
5
6
7
8
20
Hardware and Installation User Manual
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INSTALLATION
Table 3 1 Pin out for the RS 232 C/RS 423 Port
RS 232 C/423 Port
Signal
Transmitted data
Received data
Request to send
Clear to send
Data set ready
Signal ground
Received line signal
detector
Data terminal ready
All others no connection
3-28
NOTE
RS 422 Port
Pin Signal
1 Data out
5 Data in
6 Ground
7 Data out, inverted
8 Data in, inverted
All others no connection