Siemens SIMATIC RF600 Series System Manual page 127

Note
Requirement for external power sources
The reader must only be supplied with power by power supply units that meet the
requirements of LPS (Limited Power Source) and NEC Class 2.
Remark
The cable with open cable ends (6GT2891-4EHx0) has an 8-pin M12 plug at one end, the
other end of the cable id "open". There are 8 color-coded single wires there for connecting to
external devices. There are different cable lengths in the product range (3 m to 50 m). Long
cables can be shortened if necessary.
NOTICE
Insulate unused single wires
Unused single wires must be insulated individually to prevent unwanted connections of
signal lines.
NOTICE
For long cables: Adapt the power supply and transmission speed
Note that even with long cables, the supply voltage of 24 VDC must always be guaranteed.
Note also that the transmission speed on the serial interface must, if necessary, be
reduced.
5.3.1.6 Pin assignment for Industrial Ethernet interface
View of M12 plug, 4-pin, D coding
(wiring side)
Note
Use only allowed inside buildings
Only Ethernet cables laid inside buildings may be connected.
SIMATIC RF600
System Manual, 10/2016, J31069-D0171-U001-A19-7618
Pin Pin assignment
1 Data line TxP
2 Data line RxP
3 Data line TxN
4 Data line RxN
Readers
5.3 RF680R reader
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