Connecting Cables
B.2 20 mA TTY interface on the CP 340-20mA-TTY
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03
173
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
*
Pin Designation Input/Output Meaning
1 TxD - Output Transmitted data
2 20 mA - Input 5 V ground
3 20 mA + (I
1
) Output 20 mA current generator 1
4 20 mA + (I
2
) Output 20 mA current generator 2
5 RxD + Input Received data +
6 -
7 -
8 RxD - Output Received data -
5
4
3
2
1
6
7
8
9
9 TxD + Input Transmitted data +
* View from the front
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