B.2 20 Ma Tty Interface On The Cp 340-20Ma-Tty - Siemens SIMATIC CP 340 User Manual

B.2 20 mA TTY interface on the CP 340-20mA-TTY
Pin assignment
The table below shows the pin assignment for the 9-pin sub D socket in the front panel of the
CP 340-20mA-TTY.
Table B- 2 Pin assignment for the 9-pin sub D socket of the integrated interface of the CP 340-20mA-TTY
Socket to
CP 340–20mA–TTY
*
5
9
4
8
3
7
2
6
1
* View from the front
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03
Pin Designation
1 TxD -
2 20 mA -
3 20 mA + (I )
1
4 20 mA + (I )
2
5 RxD +
6 -
7 -
8 RxD -
9 TxD +

B.2 20 mA TTY interface on the CP 340-20mA-TTY

Input/Output
Output
Input
Output
Output
Input
Output
Input
Connecting Cables
Meaning
Transmitted data
5 V ground
20 mA current generator 1
20 mA current generator 2
Received data +
Received data -
Transmitted data +
173