JUMO mTRON T Manual page 33

3.6.2 Reading n words
This function is used to read n words starting from a specific address.
Data request
Slave address
1 byte
Response
Slave address
1 byte
Example
Read the IP address of the central processing unit. Here in the example, it is the address
10.10.1.69. Since each IP address range is stored in a word, 4 words (8 bytes) must be read
out. They and other Modbus addresses can be found in the Chapter 7 "Modbus address ta-
bles", page 77.
Data request:
01
Slave
Response (values in the Modbus float format):
01
Slave
Function
0x03 or 0x04
1 byte
Function
0x03 or 0x04
1 byte
03 10 6D
Function Address
of the 1st word
03 08
Function Bytes
read
3 Modbus protocol description
Address Number of words
of first word
2 bytes
Number Word value(s)
of bytes read
1 byte
00 04
Number of
words
00 0A 00 0A
10 10
IP-address
Checksum CRC
2 bytes 2 bytes
Checksum CRC
x bytes 2 bytes
14 D1
CRC
00 01 00 45 E5 37
1 69 CRC
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