dS1242
dS1242 User Manual v4.10
Function 05 (0x05) Write Single Coil
This function is used to write to a single coil (relay or I/O). Coils 1-2 are the relays 1-2. Coils
41-44 are the I/O's 1-4 remapped to coils 41-44.
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 1-2 are the relays 1-2. Coils 41-44 are the I/O's 1-4 remapped to coils 41-44.
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 15 for functions
1 & 5 or greater than 7 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.
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