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FloBoss™ S600+ Flow Computer Modbus Specification Manual

D301904X012

June 2024

Poll Format

Response Format

Address 1 byte

Function 1 byte

Coil Number 2 bytes

Coil Value 2 bytes

6.9 Function Code 16: Write Multiple Registers

Function code 16 writes a value to a multiple holding register in standard Modbus format

to any valid holding register address (Gould/Modicon addresses 40001–49999).

Poll Format

Address 1 byte

Function 1 byte

Start Item 2 bytes

Num Items 2 bytes

Byte Count 1 or 2 bytes

Note: Byte count may be 8-bit byte count or 16-bit

byte count.

Data item 1 2, 4, or 8 bytes

Data item 2 2, 4, or 8 bytes

…

Data item N 2, 4, or 8 bytes

Response Format

Address 1 byte

Function 1 byte

Item Number 2 bytes

Num Items 2 bytes

Section 7. Message Length Mode

Using standard Gould/Modicon Modbus, all variable length messages include an 8-bit

byte count field which allows the receiver to determine the amount of data in the

message. In some applications, the use of this field is not the actual byte count but the

number of data items in the message. This variation only applies to register messages.

This is also referred to as non-extended mode.

Emerson FloBoss S600+ Specification Manual

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