Instructions
Intesis
TM
KNX – Modbus Master User Manual r1.0 eng
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This information is subject to change without notice
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Points definition
Each point defined in the Intesis gateway has the following Modbus features associated to it:
Feature
Description
# Slave
Modbus slave number to which the point belongs to.
Function code
Read Func
Write Func
One of the following Modbus function codes can be used:
• 1- Read Coils.
• 2- Read Discrete Inputs.
• 3- Read Holding Registers.
• 4- Read Input Registers.
• 5- Write Single Coil.
• 6- Write Single Register.
• 15- Write Multiple Coils.
• 16- Write Multiple Registers.
Data Coding
Format
One of the following Modbus data coding formats can be used:
• 16/32/48/64 bits unsigned.
• 16/32/48/64 bits signed (one’s complement – C1).
• 16/32/48/64 bits signed (two’s complement – C2).
• 16/32/48/64 bits Float.
• 16/32/48/64 bits Bitfields.
• Error comm
Byte Order
• Big Endian
• Little Endian
• Word Inverted Big Endian
• Word Inverted Little Endian
Register Address
The Modbus register address inside the slave device for the point.
Bit inside the
register
Bit inside the Modbus register (optional). The gateway allows bit decoding from
generic 16 bits input/holding Modbus registers.
Bit coding into 16 bit input/holding Modbus registers is used for some devices to
encode digital values into this type of registers, being these registers normally
accessible using Modbus function codes 3 and 4 (read holding/input registers).
#Bits
Number of bits to be used by this signal.
Operation
Opeations that can be applied to Modbus values before to be sent to KNX network.
On the reverse way, the inverse operation is applied to KNX values before to be
sent to Modbus network. The next operations can be used:
• - (No operation)
• x10 – Modbus value x 10; KNX value / 10
• /10 – Modbus value / 10; KNX value x 10
• x100 – Modbus value x 100; KNX value / 100
• /100 – Modbus value / 100; KNX value x 100
• Is equal – Checks if Modbus value is equal to Operation value configured, if
so, send 1 to KNX, otherwise, send 0.
Operation value
The operation value is the operand of the operations, which need it. Only Is equal
needs an operand.