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6. Communications
6.3 USB Communication Port Denition
Notes:
• The USB, RS-232 and RS-485 interfaces cannot be used simultaneously. Only one interface can be used at a time.
• These three communication ports use a MODBUS protocol. Refer to the S3M10-20kVA 3-Phase MODBUS Owner’s Manual.
The USB communication port is a USB Type-B female connector.
Connections Between the Connected Computer’s USB Port and UPS System’s USB Port
Computer USB Port UPS USB Port Description
Pin 1 Pin 1 Computer: +5V
Pin 2 Pin 2 Computer: DPLUS signal
Pin 3 Pin 3 Computer: DMINUS signal
Pin 4 Pin 4 Signal ground
Available Functions of the USB Port
• Monitor UPS power status
• Monitor UPS alarm info
• Monitor UPS running parameters
• Timing o/on setting
• One-to-one communication, UPS to computer, at a distance less than 1.5 m
USB Communication Data Format
• Baud rate: 9600 bps
• Byte length: 8 bit
• End bit: 1 bit
• Parity check: None
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