SymCom MotorSaver Plus 777-P Series Installation Instructions Manual page 11

COMMUNICATIONS PORT/REMOTE RESET
The unit comes with a 9-pin sub-D connector for remote communications and/or for using a remotely
located reset button. If communications are desired, a communication module (part number
RS485MS-2W) needs to be plugged into this 9-pin connector (this is mandatory when
communicating with the unit). This module provides isolation, signal conditioning for compatibility
with Modbus RTU and RS-485 networks, and provides terminals for terminating the shielded
communications cable. Up to 99 units can be installed on one RS-485 network.
Further information can be obtained at www.symcom.com or by calling in a request. A remote reset
button can be hooked up to the communications module (part number RS485MS-2W) or can be
hooked directly to the 9-pin connector using a male sub-D connector. It should be wired as shown in
Figure 5.
Figure 5: Remote Reset Button Wiring Diagram
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