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Electrical Power Connection and Interfacing
MAN0984_Iss 4_01/19
Touchpoint Plus
Pt. No. 3011M5001
48
Technical Handbook
2)
Slide the cover off carefully and place it on a clean, anti-static surface.
3)
Fit the Modbus PCB by carefully aligning the connectors and pushing down gently, observing the orientation
shown below:
Motherboard Showing the Modbus PCB Location
4)
Connect the Modbus cables as shown below. (Y
ou should connect a 120
Ω
termination resistor (R
T
) between A and
B to prevent reflections on the RS485 circuit if TPPL is the last node in a Modbus system highway.
)
Note:
External R
T
is not needed if the logic solver side has an internal R
T
.
MODBUS RTU
Label
Terminal ID
Logic Solver
Drain
D
1
D
Data +
A (D+)
2
A (D+)
Data -
B (D-)
3
B (D-)
Modbus RTU Connections
Touchpoint
Plus
MODBUS RTU
Touchpoint
Plus
MODBUS RTU
Logic Solver
CAUTION
Some manufacturers have been known to incorrectly reverse their RS485 Data terminals, which can cause
Tx/Rx to fail. If this happens, simply swap over A and B cables and re-test.
Modbus
PCB
Modbus RTU
Terminals
B
↔
A
↔
D
↔
Logic
Solver
Ethernet
Connector