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FloBoss™ S600+ Flow Computer Modbus Specification Manual

D301904X012

June 2024

Note

The write single register function applies only to simple 16-bit registers. The float and

double formats are not supported.

6.7 Function Code 8: Loopback

Function code 08 performs a loopback test. If successful a loopback test returns the poll

received. There are no variable parameters available on this function code.

Poll Format

Address 1 byte

Function 1 byte

Value 1 2 bytes

Value 2 2 bytes

Response Format

Address 1 byte

Function 1 byte

Value 1 2 bytes

Value 2 2 bytes

6.8 Function Code 15: Write Multiple Coils

Function code 15 writes multiple coils on (1) or off (0). Enter data as a string of up to 8

digits (0s and 1s). The RHS entry represents the LSB. Data is written to any valid coil

address (Gould/Modicon addresses 00001–09999).

Poll Format

Address 1 byte

Function 1 byte

Start Coil 2 bytes

Num Coils 2 bytes

Byte Count 1 or 2 bytes

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

byte count.

Data byte 1 1 byte (coils 0–7)

Data byte 2 1 byte (coils 8–15)

…

Data byte N 1 byte (coils)

Emerson FloBoss S600+ Specification Manual

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