Siemens MPA 1 Series Instruction Manual page 48

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In order to prevent reflections on the RS485 connection, it is absolutely
necessary to terminate the connection at the pyrometer and at the con-
verter. The termination is integrated in the pyrometer and is active when
delivered from the factory.
Moreover, use a converter with galvanic isolation (e.g. W&T 38211) to
avoid problems with ground loops.
Caution !
If the supply voltage or current output are conducted via this ca-
ble, then make sure to consider the voltage drop if the cable
length is greater than 100 m.
 Disconnect the pyrometer from any voltage source
 Install all required electric connections
 Connect the converter with the PC
 Install the converter according to instructions.
 Connect the voltage supply for the pyrometer
 Change the parameter
 Start a terminal program such as Hyperterminal
. to
TERM R485
42
Operating Manual MPA