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

5. READING COMMAND EXAMPLES

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

5.1 MODBUS RTU/ASCII

The following tables show some reading examples in MODBUS RTU.
Values contained both in Query and Response messages are in hex format.
CURRENT VALUE READING
Query example: 0103000E000A0EA4
Example Byte Description
01 - Slave address
03 - Function code
00
High
Starting register
0E Low
00 High
10 words to be read
0A Low
0E High
CRC
A4 Low
Response example: 010314000009990000099F000009900000001900000998C070
Example Byte Description
01 - Slave address
03 - Function code
14 - 20 data bytes
00
High
00 Low
2457 mA phase 1 current (A1)
09 High
99 Low
00 High
00 Low
2463 mA phase 2 current (A2)
09 High
9F Low
00 High
00 Low
2448 mA phase 3 current (A3)
09 High
90 Low
00 High
00
Low
25 mA neutral current (AN)
00 High
19 Low
00 High
00 Low
2456 mA system current (A∑)
09 High
98 Low
C0 High
CRC
70
Low
88 MODBUS RTU/ASCII, TCP