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Effective 8/2006
Page 33
I.L. 66A7534H04
Appendix D MODBUS TRANSLATOR Wiring
The Digitrip 520MCV in a Medium Voltage Circuit Breaker can communicate its data using Modbus RTU protocol by
employing an mMINT device to act as a translator from INCOM communication to MODBUS communications. A
Modbus master device is shown wired to gather data.
The mMINT module CAT #MMINT use DIN rail mounting. Connector types are plug-in-Phoenix. . Power is 5 pin.
INCOM network uses a 3 pin. The RS-485 MODBUS uses a 4 pin connector which consist of signals A, B,
COMmon and SHielD.
Three Baud rates of 1200, 9600 or 19200 are selectable via programming switch for the MODBUS network. The
INCOM Baud rate is fixed at 9600 Baud.
2
3
1
4
Control voltage is 120 VAC ± 20% or 48 - 125VDC.
Communication Cable is C-H style 2A957805G01 or Belden 9463 cable.
The overall network will support up to 32 devices with any addresses from 1 to 247
Terminating resistor is 121 ohm 1 watt. Use the mMINT switches to insert these terminators at the mMINT device.
Notes:
B-2
B-1
1
Circuit Breaker
2
B-2
B-1
Circuit Breaker
3
MMINT
A B COM SHD
Modbus Master
COM Inv Non Invert Input
Digitrip 520 M CV
Digitrip 520MCV