Fluke 125
Users Manual
A-8
Profibus DP/RS-485
Profibus DP (Decentralized Periphery) is an open
Fieldbus standard used in Process Industry and Factory
Automation. It is optimized for speed, efficiency, and low
connection costs and allows for multiple data senders and
receivers to be connected to an ongoing cable. Data
traffic is continuous.
To check this bustype, ScopeMeter Channel A and B are
on and DC coupled. The recommended probes are
STL120 (1:1). Probe tip A must be attached to the A
(positive; usually green) wire; Probe tip B to the B
(negative; usually red) wire, and the COM input (or Black
Ground Lead) to Data Ground (DGND). Cabling and
some connector examples are shown in the figures
below. Please note that cables often incorporate
termination resistors at the end of the network chain.
GREEN
RED
CHANNEL A
CHANNEL B
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