MIB Installation Instructions and Reference Handbook
DEIF A/S
Page 26 of 50
Communication
The communication port and protocol are RS485 and Modbus RTU. The
terminals are A, B and S (14, 15, 16). A is differential data signal +, B is
differential data signal and S is connected to a shield of twisted pair cables.
The unit can handle up to 32 devices on the RS485 bus. The maximum
connection length is 1000m. Conductors A and B should be terminated with a
120Ω terminating resistor at the end of the string.
The MIB 7000C operates as slave unit, and the master unit is normally a PC,
PLC or a data collector of RTU. The communications port of the master unit
must have RS485 port.
Use shielded twisted pair of cable AWG22 (0.6mm
2
).
The shield of the RS485 cable must be connected to the ground at
one end only.
USB/RS485 or RS232/RS485 converter can be used to convert
signal for PC.
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