ATIM LoRaWAN ACW/LW8-DIN-RSM, User Manual

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ATIM_ACW-DINRSM_UG_EN_V2.8
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Modbus frame parameters (Code 30 to 61):
These parameters are ‘buffered’ para meters: one or more parts of the configuration can be
applied/accessed. Refer to the document ‘ATIM_ACW - DLConfig_UG_FR_vx.pdf’ for more details.
The buffer for this parameter consists of 6 bytes, as follows:
Octet 1 Octet 2 Octet 3 Octet 4 Octet 5 Octet 6
Function code
Concatenation
@Slave @Reg/bit
LSB
@Reg/bit
MSB
Header Number of
registers/bits
By default, all these bytes are set to 0.
Function code – Byte 1 – bits 0 to 2:
This parameter corresponds to the Modbus function code. The possible values in byte 1 for these bits are:
⚫
0x01 = Function code 0x01, Read Coils.
⚫
0x02 = Function code 0x02, Read Discrete Inputs.
⚫
0x03 = Function code 0x03, Read Holding Registers.
⚫
0x04 = Function code 0x04, Read Input Registers.
Note : By default, the value is 0x00. If a frame is activated (number of registers or bits is non-zero) and this
value is set to 0x00, this will cause an internal error when the frames are sent.
Concatenation – Byte 1 – bit 7:
This parameter is masked with the function code parameter to concatenate multiple registers from multiple
Modbus frames in a single radio frame. The possible values in byte 1 for these bits are:
⚫
0x00 = No concatenation or creates a new radio frame.
⚫
0x80 = Activates concatenation of the registers read in with the previous radio frame.
Limitation :
1. If the first frame (Code 30) activates concatenation, this frame will be considered as deactivated.
2. If a frame activates concatenation (e.g. Code 42) and the preceding frame is not activated (e.g. Code
41), then this frame will be considered as deactivated.
@Slave – Byte 2:
This parameter corresponds to the Modbus ID or the address of the Modbus slave.