Port of the Modbus Server

Default: 502

Server ID of the Modbus Server

Default: 1

Maximum amount of registers read in a single message

Note: Some servers allow for specific numbers of registers read in a single message. If this is exceeded, the connection could be refused

Default: 123

Chooses which function code used for writing

• Multiple registers: 0x15 / 0x16
• Single register: 0x05 / 0x06

Default: Multiple registers

Endianness is documented in this article

Default: Big endian

Endianness is documented in this article

Default: First byte high

Registers are the addressing syntax used by Modbus.

Depending on the register type, chosen below, there are two ways of addressing.

Both 5-digit and 6-digit registers are supported 

When Register Type is Auto

Here we use the full address of the register. 

The first Holding Register will be 40001 or 400001

When Register type is Holding Register (or any other type)

Here SIA Connect will automatically fill out the full register syntax.

The first Holding Register will be 0

Register type defines the method of auto-filling the full register syntax

• Auto
  Use the full address syntax for the register. 4000X for Holding registers, etc.
• Holding Register
  SIA Connect will automatically fill out the full register syntax.
  Holding Register 0 equals Register 40001
• Input Coil
  SIA Connect will automatically fill out the full register syntax.
  Input Coil 0 equals Register 10001
• Output Register
  SIA Connect will automatically fill out the full register syntax.
  Output Coil 0 equals Register 00001
• Input Register
  SIA Connect will automatically fill out the full register syntax.
  Input Register 0 equals Register 30001

Chooses both the amount of registers being read, and how they are parsed as data.

If a tag is over 1 register, this is where it is chosen. Nothing changes on the addressing syntax, as it is automatically handled by SIA Connect