Writing Command Examples; Modbus Rtu/Ascii - Algodue ELETTRONICA UPM309 Manual Del Usuario

6. WRITING COMMAND EXAMPLES

In this chapter, some writing command examples are described according to the used communication protocol
(RTU/ASCII or TCP).

6.1 MODBUS RTU/ASCII

The following tables show some writing examples in MODBUS RTU.
Values contained in Command, Query and Response messages are in hex format.
WIRING MODE SETUP
Command example: 0110203C000204000000032E29
Example Byte Description
01 - Slave address
10 - Function code
20
High
Starting register
3C Low
00 High
2 words to be written
02 Low
04 - 4 data bytes
00 High
00 Low
Set 1 phase wiring mode
00 High
03 Low
2E High
CRC
29 Low
Response example: 0110203C0002048A
Example Byte Description
01 - Slave address
10 - Function code
20 High
Starting register
3C
Low
00 High
2 written words
02 Low
04 High
CRC
8A Low
92 MODBUS RTU/ASCII, TCP