Siemens ATC5300 Manual page 13

Example:
For instance, to read the value of the phase-to-phase voltage, which resides at location 04
(04 Hex) from the slave with serial address 08, the message to send is the following:
:
Whereas:
: = ASCII 3Ah message start delimiter
08 = slave address
04 = Modbus® function "Read input register"
00 03 = Address of the required register (L2 voltage of line 1) decreased by one
00 02 = Number of registers to be read beginning from address 04
EF = LRC Checksum
CRLF = ASCII 0Dh 0Ah = Message end delimiter
The ATC answer is the following:
:
Whereas:
: = ASCII 3Ah message start delimiter
08 = Multimeter address (Slave 08)
04 = Function requested by the master
04 = Number of bytes sent by the multimeter
00 00 01 A0 = Hex value of the phase-to-phase voltage (416 V)
4F = LRC checksum
CRLF = ASCII 0Dh 0Ah = Message end delimiter
ATC5300
Modbus Communication Protocol, Edition 03/2011, A5E02469001-02
08 04 00
08 04 00
1.12 Modbus® ASCII Protocol
03 00
00 00 01
General Information
02 EF CRLF
A0 4F CRLF
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