Scaime eNod4-B - Function (06 H) - Write Single Register; Function (10 H) - Preset Multiple Registers (N = 30 Max); Error Frames; Address and Baud Rate

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User manual SCAIME: NU-soft-eNod4B-E-0716_236704-C.doc
slave address
03
H
or 04
H
NB *
data 1
…
CRC16
1 byte
1 byte
1 byte
2 bytes
2 bytes
2 bytes
* NB: number of read bytes (= N*2)
3.4.2 Function (06H) – write single register
• request command sent to the slave :
slave address
06
H
register offset
data
CRC16
1 byte
1 byte
2 bytes
2 bytes
2 bytes
• slave response :
slave address
06
H
register offset
data
CRC16
1 byte
1 byte
2 bytes
2 bytes
2 bytes
3.4.3 Function (10H) – preset multiple registers (N = 30 max)
• request command sent to the slave :
slave address
10
H
starting register
offset
N registers
NB
Data 1
…
CRC16
1 byte
1 byte
2 bytes
2 bytes
1 byte
2 bytes
2 bytes
2 bytes
• slave response :
slave address
10
H
starting register
offset
N registers
CRC16
1 byte
1 byte
2 bytes
2 bytes
2 bytes
3.4.4 Error frames
• frame format in case of a transaction error :
slave address
Function code
+ 80
H
error code
CRC16
1 byte
1 byte
1 byte
2 bytes
• Error codes meaning :
Error code
Meaning
description
01
H
illegal function
Modbus-RTU function not supported by eNod4
02
H
illegal data address
register address requested out of eNod4 register table
03
H
illegal data value
forbidden data values for the requested register
04
H
eNod4 not ready
eNod4 is not ready to answer (for example measurement
request during a taring operation)
3.5 Address and Baud rate
Address Modbus RTU
Meaning
Access
Type
0x0001
Address and Baud rate
RO
Uint
Reads the address and baud rate selected on the front panel via the rotary switches and dipswitches.
3.6 Product identification
Software and product versions of the eNod4 are accessible via Modbus RTU.