Sartorius QC64EDE-S - Pin Assignment Chart for 12-pin Round Connector; Interface Connector:

Pin Assignment Chart for12-pin Round Connector
Interface Connector:
Round connector
B (TXD) send
C (RXD) receive
D (DTR)
H (CTS)
E (SGN GND)
Signal IP65 circular ring 25-pin (with DB25-scale
12-pin adapter cable)
>A 18
TXD B 2
RXD C 3
DTR D 20
SGND E 7, 8,14
+5 V F 13, 25,12
<G 16
CTS H 5
=J 17
Universal switch K 15
SET L 19
+12 V M 11
ensure a low-ohm connection between shielding and plug housing
4–18