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ATIM_ACW-DINRSM_UG_EN_V2.8
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
If the first frame (Code 30) activates concatenation, this frame will be considered as deactivated.
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.
@Reg/bit
–
Byte 3 and Byte 4
This parameter corresponds to the address of the register or bit where the read operation should start. Byte 3
corresponds to the low-order byte of the value and byte 4 corresponds to the high-order byte of the value.
Header
–
Byte 5
This parameter corresponds to a value that is sent directly in a radio frame to identify the frame. It is used in periodic
frames (see ‘Statement Period parameter (Code 14)).
NOTE
When concatenation is used, only the header of the first frame (Modbus) will be used in the radio frame.
Number of registers/bits
–
Byte 6
This parameter corresponds to the number of registers or bits to be read. A value of 0 deactivates the frame. The
maximum value will vary depending on whether concatenation with other frames is activated or not. For LoRaWAN,
the maximum value is limited to 17 registers or 255 bits in one radio frame; in Sigfox, the number of registers is limited
to 5 registers or 80 bits in one radio frame.
NOTE
In other words, you have 34 bytes of data available for your register values with LoRaWAN and 10 bytes available with Sigfox.
