WAGO-I/O-SYSTEM 750
Connect Devices
45
750-652 Serial Interface RS-232 / RS-485
Manual
Version 1.4.0
7.2.4
DMX Operating Mode
In the DMX operating mode, the wiring is based on the RS-485 operating mode.
7.2.5
Data Exchange Mode
Figure 16: Point-to-point Connection Between Two Nodes
In this mode, the contacts of the I/O modules to connect are connected to each
other crosswise.
In the Data Exchange operating mode (point-to-point connection), a twisted-pair
cable should be used at least for larger cable lengths. Two wire pairs and one
ground wire are required. The ends of the cable should be terminated with a
terminal resistor.
Generally, a passive resistance is used by connecting the signal lines via one
100 … 120 Ω resistor apiece to the ends of the of the cable (A-B).