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EQ5 AC Drive Operations Manual

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TECO – Westinghouse Motor Company Serial Communications Modbus 112

8-4 RS-485 Modbus RTU Serial Communications

The serial communications interface supports operation, configuration and monitoring of inverter

functions through an EIA/RS-485 connection. The serial interface is based on Modbus RTU

protocol. This protocol allows the inverter to function as an RTU slave on an industrial network.

8- 4-1 Transmission Specifications

Item Specification

Physical level EIA/RS-485

Transmission distance 1600 ft (500 m)

Number of nodes 32 total

Transmission speed 19200, 9600, 4800, 2400 [bits/s]

Transmission mode Half duplex

Transmission protocol Modbus RTU

Character code Binary

Character length 8 bits

Error check CRC

8- 4-2 Connection

Connection method:

Use shielded wire and connect to the control terminals (DX-, DX+ and SD). A terminating

resistor should be added between the data lines on the each end of the network. The value of

the terminating resistor depends on the characteristic impedance of the cable. A common

value is 120 ohms.

Control terminals:

Terminal

Designation

Terminal Name Function Description

DX+

RS-485 communication data (+) Input/output terminals for RS-485

communication.

DX-

RS-485 communication data (–)

Cable shield Electrically floating

8- 4-3 Serial Interface Configuration

Inverter function codes H30 to H39 are used to configure the serial interface parameters, such

as device address, baud rate and error response.

8- 4- 4 Modbus RTU Functions

The following RTU functions are supported. The maximum number of consecutive parameters

for function 03 and 16 messages is 16.

Code Description

Read Holding Registers (16 registers maximum)

Preset Single Register

Preset Multiple Registers (16 registers maximum)

1 2 ... 113 114 115 116 117 118 119 120 121 122 123 ... 130 131

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