HEIDENHAIN PROFIBUS-DP (DPV2) - Manual (Page 16)

Encoder gateway installation
16
2.3 BUS lines
The PROFIBUS bus line connections of the M12 equipped
devices are constituted by a male B-coded 5 pin M12 connector
(bus in), and a female B-coded 5 pin M12 connector (bus out).
Figure 5 Orientation of M12 bus connectors
Bus in line Bus out line
Function Pin Function Pin
Not connected 1 VP 1
A 2 A 2
Not connected 3 DGND 3
B 4 B 4
Chassis 5 Chassis 5
Table 3 Pinning M12 bus in/out connectors
Bus in Bus out