Intesis
TM
Modbus Server
– Mitsubishi Heavy Industries AC
User’s Manual r1.0 eng
© HMS Industrial Networks S.L.U - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
8 / 26
Modbus interface of Intesis
TM
Description
Intesis
TM
acts as a slave device in the Modbus interface. The physical interface can be either
Ethernet, if using Modbus TCP, or the EIA485 (or EIA232), if using Modbus RTU.
Functions supported
This part is common for Modbus RTU and TCP:
•
Modbus functions 03 and 04 (
read holding registers
and
read input registers
) can
be used to read Modbus registers.
•
Modbus function 06 (
Single Multiple Holding Registers
) must be used to write
Modbus registers.
•
As per Modbus standard specification, register contents are always expressed in
MSB..LSB (Bid Endian).
•
Modbus error codes are fully supported, they will be sent whenever a non-valid
Modbus action or address is required (see section 9).
Modbus RTU
Baud rate can be selected from 1200, 2400, 4800, 9600, 19200 and 38400.
Information structure:
•
Data Bits: 8
•
Parity Bit: Selectable from
non
,
even
,
odd
or
second stop bit (2stop)
.
•
Stop Bit: 1
Modbus slave number can be configured.
Physical connection (EIA232 or EIA485) can also be selected.
Only the lines RX, TX and GND of the EIA232 connector are used (TX and RX for EIA485).
Modbus TCP
The TCP port to use can be configured (by default 502 is used).
The IP address, subnet mask and default gateway address to use by Intesis
TM
can be also
configured.
Address Map
Address map is fixed for each indoor unit and can be consulted as explained in the following
tables. Please, remember that in the tables
R/W
stands for
Read
and
Write
,
R
stands for
Read Only
and
W
stands for
Write Only.