HMS Networks Intesis INKNXMBM1000200 User Manual page 16

Modbus Interface
Feature
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)
Data coding
format
• 16/32/48/64 bits signed (two's complement - C2)
• 16/32/48/64 bits Float
• 16 bits Bitfields
• Big-endian
• Little-endian
Byte order
• World inverted big-endian
• World inverted little-endian
Register The Modbus register address on the server device for the signal point.
address
You can decide where the signal starts in the register (optional function). The gateway
allows bit decoding from generic 16 bits input/holding Modbus registers.
Bit
Bit coding into 16-bit input/holding Modbus registers is used to encode digital values
into the registers, being usually accessible using Modbus function codes 3 and 4 (read
holding/input registers).
# Bits Number of bits used by the signal.
Deadband Determine the change of value (COV) in a signal value.
The following options are available:
• No operation
• Arithmetic operations: Operations that can be applied to Modbus values before
sending them to the KNX control system. The inverse operation is also applied to
KNX values before sending them to the Modbus installation.
– Multiply by ( x )
– Divide by ( / )
Operation
• Logical operations: Operations that can be applied to read-only or write-only signals.
These operations return "1" when the result matches the condition and "0" when it
doesn't.
– Is equal ( == )
– Is different ( != )
– Is less than ( < )
– Is greater than ( > )
Operation Value Value for the operation formula.
Operation It shows the formula applied to the signal and the direction (from Modbus to KNX or vice
Definition versa).
Figure 2. Points definition window. See the different operation options in the last three columns
USER MANUAL Version 1.0
Description
Modbus RTU Client to KNX TP Gateway
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