Appendix A Modbus Communication Protocol - V&T E5 Series User Manual

Appendix A Modbus Communication Protocol

T. Support Protocol
Support Modbus RTU protocol, broadcast address is 0, the slave address range isT to T47, T48 to T55 is
reserved.
T. Interface mode
RS485: Asynchronous, half duplex, LSB sending priority. Low byte is follow the high byte.
Communication port A (Operation Panel RJ45 interface) default data format: 8−N−T, 38400 bps
Communication port B (terminal RS485+T−) default data format: 8−N−T, T9T00 bps, see group PC
description.
It is recommended to adopt EIATTIA T568B network cable straight-through connection, the interface of
port A is defined as:
Pin of communication
port A
Signal of
communication port A
EIATTIA T568A
EIATTIA T568B
3. Protocol Format
ADU (Application Data Unit) check sum is the CRCT6 check sum of the front three parts of ADU (slave
address, function code and data), through exchange of high byte and low byte.
If the communication request response error, the feedback of PDU(Protocol Data Unit) will be error code
and abnormal code. Error code is 0x80, abnormal code shows the error type.
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E5 Series High Performance Universal Inverter
Appendix Figure T RJ45 interface
T T
+5V GND
White
Green
green
White
Orange
orange
Appendix Figure T Protocol Format
Appendix A Modbus Communication Protocol
T
8
3 4
485+ 485−
White
Blue
orange
White
Blue
green
User's Manual
5 6
485+ 485−
White
Orange
blue
White
Green
blue
7 8
GND +5V
White
Brown
brown
White
Brown
brown