Intelligent Technologies Modbus to QCPort Adapter Manual
January 2006
MN05002002E (C)
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Page 42
Example Transmit Message
Read Register 40111 (nominal frequency) from an SV drive
SV drive address is 02
Read using function code 03
Message will be constructed:
0x01 for the Modbus node ID
0x03 for the function code
0x006E to read register 111
Notice
Modbus is address based, not register based. The address is equal to 1 minus the
register; therefore register 111 is address 110, which is why to read register 111 a
0x006E (110 decimal) was written.
Table 41 Modbus Ethernet Pass-Through Receive Message Format
Address
02 hex
Slave Address 01 hex
Function Code
03 hex
Function code 3 (read single register)
Data
Starting address HI
00
Starting address LO
6E
The response will be 0x003C (60)
