BENSHAW RSi H2 Series - Page 322

Communications
310
890053-00-02
10.3.6.1.9 Request
Slave
Station ID
Func.
Code
Start
Addr.
(Hi)
Start
Addr.
(Lo)
No of
Reg.
(Hi)
No of
Reg.
(Lo)
Byte
Count
Reg.
Value
(Hi)
Reg.
Value
(Lo)
CRC
(Lo)
CRC
(Hi)
1 byte
1 byte
1 byte
1 byte
1 byte
1 byte
1 byte
1 byte
1 byte
1 byte
1 byte
10.3.6.1.10 Normal Response
Slave Station
ID
Func. Code
Start Addr
(Hi)
Start Addr
(Lo)
No of Reg.
(Hi)
No of Reg.
(Lo)
CRC (Lo)
CRC (Hi)
1 byte
1 byte
1 byte
1 byte
1 byte
1 byte
1 byte
1 byte
10.3.6.1.11 Error Response
Slave Station ID
Func. Code
Except. Code
CRC(Lo)
CRC(Hi)
1 byte
1 byte
1 byte
1 byte
1 byte
* Func. Code of the error response is [Request Func. Code] + 0x80.
10.3.6.2 Exception Code
Code
01
ILLEGAL FUNCTION
02
ILLEGAL DATA ADDRESS
03
ILLEGAL DATA VALUE
06
SLAVE DEVICE BUSY
14
WRITE PROTECTION
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
Item
Station ID
Function
Starting
Address
# of
Register
Byte
Count
Data 1
Data 2
CRC
Hex
0x01
0x10
0x1102
0x0002
0x04
0x0032
0x0064
0x1202
Desc.
COM- 01
Int485 St
ID
Preset
Multiple
Register
Start
Address-1
(0x1103-1)
-
-
50
(Acc time
5.0 sec)
100
(Dec time
10.0 sec)
-
Frame Transmission from Slave to Master
Item
Station Id
Function
Starting Address
# of Register
CRC
Hex
0x01
0x10
0x1102
0x0002
0xE534
Desc.
COM-01 Int485 St ID
Preset Multiple
Register
Starting Address-1
(0x1103-1)
-
-
Example of Modbus-RTU Communication In Use