ProSoft Technology MVI69L-MBTCP - Manual (Page 125)

MVI69L-MBTCP ♦ CompactLogix Platform Reference
Communication Module User Manual
ProSoft Technology, Inc. Page 125 of 152
January 6, 2014
Func Code - Tells the Client to read the register values from the Server. FC3.
Addr in Dev - Tells the Client where in the Server's database to obtain the data.
In the above example, the Client's Modbus command to transmit inside the
Modbus packet will be as follows.
Server address Function Code Address in Device Reg count
DEC 01 3 6100 2
HEX 01 03 17 D4 00 02
In the above example the (Enron/Daniel supporting) Server's Modbus command
to transmit inside the Modbus packet will be as follows.
Server address Function Code Byte Count Data
DEC 01 3 8 32.75 275.69
HEX 01 03 08 00 00 42 03 D8 52 43 89
In the above example the (a NON-Enron/Daniel supporting) Server's Modbus
command that will be transmitted inside the Modbus packet will be as follows.
Server address Function Code Byte Count Data
DEC 01 3 4 32.75
HEX 01 03 04 00 00 42 03