GEK-106426B
MIB High Impedance Bus Differntial Relay
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1 GETTING STARTED
1.3 MII RELAY FAMILY HARDWARE
1
1.3MII RELAY FAMILY HARDWARE
1.3.1 MOUNTING & WIRING
Please refer to the HARDWARE chapter for detailed relay mounting and wiring instructions. Review all
WARNINGS and
CAUTIONS.
1.3.2 COMMUNICATIONS
The ENERVISTA MII SETUP software can communicate to the relay via the faceplate RS232 port, or the rear panel RS485
port. To communicate with the relay via the RS232 port, a standard “straight through” serial cable is used. The DB9 male
end is connected to the relay and the DB9 or DB25 female end is connected to the PC COM1 or COM2 port as described
in the HARDWARE chapter.
To communicate with the relay’s RS485 port from a computer’s RS232 port, a RS232/RS485 converter box is required. GE
Multilin offers F485, DAC300 and RS232/485 converters. This converter box is connected to the computer using a “straight
through” serial cable. A shielded twisted pair (20, 22 or 24 AWG; 0.25, 0.34 or 0.5 mm
2
) cable is used to connect the
converter box to the relay rear communication terminals. The converter box (-, +, GND) terminals are connected to the
relay (SDA, SDB, GND) terminals respectively. For long communication cables (longer than 1 km), the RS485 circuit must
be terminated in a RC network (i.e. 120 ohm, 1 nF) as described in the HARDWARE chapter.
1.3.3 FACEPLATE KEYPAD & DISPLAY
Display messages are organized into menus under the main headings: Actual Values, Main Settings, Advanced Settings,
Operations and Change Date&Time. A 5-key keypad and a 16x2 character LCD display (shown below) are used as
elementary local HMI.
