Lika SMAX-AI1-PRG-L2, User Manual

Page: 54 / 84

SMAX MODBUS®
Request PDU
Function code 1 byte 06 hex
Register address 2 bytes 0000 hex to FFFF hex
Register value 2 bytes 0000 hex to FFFF hex
Response PDU
Function code 1 byte 06 hex
Register address 2 bytes 0000 hex to FFFF hex
Register value 2 bytes 0000 hex to FFFF hex
Exception Response PDU
Error code 1 byte
86 hex (=06 hex + 80 hex)
Exception code 1 byte 01 or 02 or 03 or 04
Here is an example of a request to write in the
Operating parameters [0003
hex] item (register 4): we need to set the scaling function ( Scaling function =
1) and the increasing counting when the sensor moves in the direction shown
by the arrow in Figure 1 (
Code sequence
= 0).
Request Response
Field name (Hex) Field name (Hex)
Function 06 Function 06
Register address Hi 00 Register address Hi 00
Register address Lo 03 Register address Lo 03
Register value Hi 00 Register value Hi 00
Register value Lo 01 Register value Lo 01
As you can see in the table, the value 00 01 hex, i.e. 0000 0000 0000 0001 in
binary notation, is set in the
Operating parameters [0003 hex]
item (register
MAN SMAX MB E 1.2 Modbus® interface 54 of 84