LSIS LSLV-S100 - Page 258

244
RS-485 Communication Features
Exception Code
Code
01: ILLEGAL FUNCTION
02: ILLEGAL DATA ADRESS
03: ILLEGAL DATA VALUE
06: SLAVE DEVICE BUSY
Response
Field Name
Station ID
Function*
Exception Code
CRC Lo
CRC Hi
* The function value uses the top level bit for all query values.
Example of Modbus-RTU Communication in Use
When the Acc time (Communication address 0x1103) is changed to 5.0 sec and the Dec time
(Communication address 0x1104) is changed to 10.0 sec.
Frame Transmission from Master to Slave (Request)
Item
Station
ID
Function
Starting Address
# of
Register
Byte
Count
Data 1
Data 2
CRC
Hex
0x01
0x10
0x1102
0x0002
0x04
0x0032
0x0064
0x1202
Description
CM.01
Int485 St
ID
Preset
Multiple
Register
Starting
Address -1
(0x1103-1)
-
-
50
(ACC
time
5.0sec)
100
(DEC
time
10.0sec)
-
Frame Transmission from Slave to Master (Response)
Item
Station ID
Function
Starting Address
# of Register
CRC
Hex
0x01
0x10
0x1102
0x0002
0xE534
Description
CM.01
Int485 St ID
Preset Multiple
Register
Starting Address -1
(0x1103-1)
-
-