Kit CM44x Wiring
Endress+Hauser 23
6.3 Bus termination (module 485 only)
There are two ways to terminate the bus:
1. Internal terminating resistor (via DIP switch on the module board)
‣ Using a suitable tool, such as a tweezers, set all 4 DIP switches to the "ON" position.
The internal terminating resistor is used.
a0016306
Fig. 24: Structure of the internal terminating resistor
2. External terminating resistor
Here, leave the DIP switches on the module board in the "OFF" position (factory setting).
‣ Connect the resistor to terminals 81 and 82 on the front of module 485 for 5-V power
supply.
The external terminating resistor is used.
Fig. 23: DIP switches for internal terminating resistor
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