CERUS CI-007-P2 - RS485;Modbus RTU Communication Wiring

Chapter 3 – Installation & Wiring
3-10
3.3.4 RS485/Modbus RTU communication circuit wiring
Use for Modbus-RTU communication terminals C+ for signal High and C- for signal Low. Set the J3 dip
switch to ON (Upward) position to connect 120 termination resistor. Connect cable shield to CM or
Ground terminals.
Item Specification
Transmission type Bus method, Multi drop Link System
Applicable VFD P Series
Number of VFDs Max. 31
Transmission distance
4000 feet (1200m) Max.
Up to 2300 feet (700m) recommended
Recommended cable Shielded Cable Twisted-pair 0.75mm
2
(18AWG)
Item Specification
Installation C+, C- & CM terminals on the control terminal block
Power supply Isolated from VFD power supply
C+ CM C-
M6 24 M7 M8
M1 CM M2 M3 24 M4 M5
J3
ON
OFF