Endress+Hauser NRF81 - Page 25

Tankside Monitor NRF81 Electrical connection
Endress+Hauser 25
6.1.4 Terminals of the "Modbus" or "V1" module
D
E
F
C
B
A
1
1
1
1 3
2
2 4
1
HR
CDI
WP
on
SIM
2
2
3
3
4
4
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
POWER
A
1 2 3 4
A1-4
i
D
1
2 3 4
D1-4
A0031200
 7 Designation of the "Modbus" or "V1" modules (examples); depending on the device version these modules
may also be in slot B or C.
Depending on the device version, the "Modbus" and/or "V1" module may be in different
slots of the terminal compartment. In the operating menu the "Modbus" and "V1" interfaces
are designated by the respective slot and the terminals within this slot: A1-4, B1-4, C1-4,
D1-4.
Terminals of the "Modbus" module
Terminal
1)
Name Description
X1 S Cable shielding connected via a capacitor to EARTH
X2 0V Common reference
X3 B- Non-inverting signal line
X4 A+ Inverting signal line
Designation of the module in the operating menu: Modbus X1-4; (X = A, B, C or D)
1) In this column, "X" stands for one of the slots "A", "B", "C", or "D".
Terminals of the "V1" module
Terminal
1)
Name Description
X1 S Cable shielding connected via capacitor to EARTH
X2 not connected
X3 B- Protocol loop signal -
X4 A+ Protocol loop signal +
Designation of the module in the operating menu: V1 X1-4; (X = A, B, C or D)
1) In this column, "X" stands for one of the slots "A", "B", "C", or "D".