Fluke 225C User Manual - Page 154

Profibus DP/RS-485., the negative RxD/TxD-N, DATA - cost

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Profibus DP/RS-485. Profibus DP (Decentralized Periphery) is an open field bus 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 the Fluke 10:1 probes. Connect the probe as shown below. DATA + DATA DATA GND The positive (RxD/TxD-P, DATA +) wire is usually green; the negative (RxD/TxD-N, DATA -) wire is usually red. Cabling and some connector examples are shown in the adjacent figures. Please note that cables often incorporate termination resistors at the end of the network chain. A Appendices Bushealth Measurements Green Red Wiring and bus termination for RS-485 transmissions in PROFIBUS 2 3 1 5 4 M12 connector for RS-485 in IP65/67 Pin assignment: 1: VP 2: Rxd/TxD-N 3: DGND 4: RxD/TxD-P 5: Shield A-7

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Appendices
Bushealth Measurements
A
A-7
Profibus DP/RS-485.
Profibus DP (Decentralized Periphery) is an open field
bus 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 the
Fluke 10:1 probes. Connect the probe as shown below.
DATA +
DATA -
DATA GND
The positive (RxD/TxD-P, DATA
+
) wire is usually green;
the negative (RxD/TxD-N, DATA
-
) wire is usually red.
Cabling and some connector examples are shown in the
adjacent figures. Please note that cables often
incorporate termination resistors at the end of the network
chain.
Green
Red
Wiring and bus termination for RS-485 transmissions in PROFIBUS
1
2
3
5
4
M12 connector for
RS-485 in IP65/67
Pin assignment:
1: VP
2: Rxd/TxD-N
3: DGND
4: RxD/TxD-P
5: Shield