Siemens SIMATIC RF186C Operating Instructions Manual page 29

Reader connector system
A reader always occupies one M12 socket on the RF18xC/RF18xCI. You can connect the
reader to the communications module using a preassembled cable. The connection cable is
available in lengths of 2, 5, 10, 20 and 50 m as standard. If necessary, these can be
extended.
Figure 5-3
SIMATIC RF185C, RF186C, RF188C, RF186CI, RF188CI
Operating Instructions, 06/2019, C79000-G8976-C512-02
Overview of connections
Connection
29