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6. DATA ADDRESSES
The data in the modules is stored in registers. These registers are accessed over the network
using the MODBUS communication protocol.
The MODBUS mode used is the RTU mode with the following set-up:
BAUD RATE
DATA BITS
PARITY
STOP BITS
There are 4 types of variables which can be accessed from the module. Each module has
one or more of these data variables.
Type
1
2
3
4
Note: Due to the limited buffer memory size in the modules, the Modbus
message length must be limited to 8 consecutive read or write registers.
If more registers are required then a new poll group must be added for
the next 8 registers.
9600
8
NONE
1
Start Address
00001
10001
30001
40001
Variable
Digital Outputs
Digital Inputs
Input registers (Analog)
Output registers (Analog)
9
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