User Manual

dS378

dS378 User Manual v4.03

Function 05 (0x05) Write Single Coil

This function is used to write to a single coil (relay or I/O). Coils 1-8 are the relays 1-8. Coils

9-32 are the virtual relays. Coils 41-47 are the I/O's 1-7 remapped to 41-47.

Function 15 (0x0F) Write Multiple Coils

Use this function when you need to write to multiple relays and I/O’s at the same time. Coils

1-8 are the relays 1-8. Coils 9-32 are the virtual relays. Coils 41-47 are the I/O's 1-7

remapped to 41-47.

Error code 1

This error is returned if an unknown or unimplemented function is received. Only functions 1, 4

5 & 15 are implemented.

Error code 2

This error is returned if an illegal address is requested. Addresses greater than 47 for functions

1 & 5 or greater than 40 for function 4 will generate this error.

Error code 3

This error is returned if an illegal data value is received. Number of points = zero will generate

this as will an illegal data value for function 5.