Modbus Interface; Functions Supported; Modbus Rtu; Modbus Tcp - HMS Intesis INMBSFGL016O000 User Manual

Modbus Server – FUJITSU VRF
TM
Intesis

2. Modbus interface

In this section, a common description for all Intesis Modbus series gateways is given, from the point of view of
Modbus system which is called from now on internal system. Connection with the Fujitsu VRF system is also called
from now on external system.

Functions supported

2.1.
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 functions 06 and 16 (Single Multiple Holding Registers and Write Multiple Holding Registers) can be used
to write Modbus registers.
Configuration of poll records is possible between Modbus addresses 0 and 20000. Addresses that are not defined
in section 2.2 (Modbus map of the device) are read-only and will always report 0.
Modbus error codes are supported, they will be sent whenever a non-valid Modbus address is queried.
All registers are 16-bit signed integer, in standard Modbus Big Endian (MSB/LSB) format.
Intesis supports Modbus RTU and Modbus TCP and both interfaces can be used simultaneously.

Modbus RTU

2.2.
Both EIA485 and EIA232 physical layers are supported. Only the lines RX, TX and GND of the EIA232 connector
are used (TX and RX for EIA485).
Baud rate can be selected between 1200, 2400, 4800, 9600, 19200, 38400, 56700 and 115200. Parity (none, even
or odd) and stop bits (1 or 2) can be selected as well.
Modbus slave number must be configured and the physical connection (RS232 or RS485) can also be selected

Modbus TCP

2.3.
TCP port to use (default is 502) and keep alive period must be configured.
IP settings of Intesis (DHCP status, own IP, net mask and default gateway) must be configured as well.
© HMS Industrial Networks S.L.U - All rights reserved
This information is subject to change without notice
User Manual r1.0 EN
URL https://www.intesis.com
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