Emerson FloBoss S600+ - 6.7 Function Code 8: Loopback; 6.8 Function Code 15: Write Multiple Coils

FloBoss™ S600+ Flow Computer Modbus Specification Manual
D301904X012
June 2024
10
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)