Modbus Specifications; Implemented Modbus Functions; Modbus Physical Layer; Modbus Registers - HMS Networks Intesis IN485FGL001I000 User Manual

IN485FGL001I000 Gateway

8. Modbus Specifications

The following sections provide the gateway's specifications when it is set for Modbus RTU.

8.1. Implemented Modbus Functions

The IN485FGL001I000 gateway implements the following standard Modbus functions:
• 03: Read Holding Registers
• 04: Read Input Registers
• 06: Write Single Register
• 16: Write Multiple Registers
IMPORTANT
Even though function 16 is available, the gateway does not allow writing operations on more than
one register with the same request, so the length field when using this function should always be
one.

8.2. Modbus Physical Layer

The IN485FGL001I000 gateway implements a Modbus RTU (server) interface to be connected to an EIA-485
bus. It features an 8-N-2 communication (eight data bits, no parity, and two stop bits) with several available
baud rates: 2400, 4800, 9600 -default-, 19200, 38400, 57600, 76800, and 115200 bps. It also supports 8-N-1
communication (eight data bits, no parity, and one stop bit).

8.3. Modbus Registers

Register Name
ON/OFF
OPERATION MODE
FAN SPEED
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Possible values
0: Off
1: On
0: Auto
1: Heat
2: Dry
3: Fan
4: Cool
NOTE
The available modes may vary depending
on the AC model.
0: Auto
1 .. 5: Speed 1 .. Speed 5
10: Fan stop
NOTE
The available fan speeds may vary
depending on the AC model.
NOTE
Set the available fan speeds via the DIP
switch SW1.
Modbus Specifications
Modbus PLC
address address
R/W
(base 0) (base 1)
0 1 R/W
1 2 R/W
2 3 R/W
USER MANUAL Version 1.0.9