The Indactic 33/41 protocol was developed by the BBC company (ABB) at the
beginning of the eighties. It found high resonance in the energy industry for
the automation of transformer stations enabling the communication between a
control station and several RTUs. It is often referred to as "Indactic 33", so
it is easily confused with the Indactic 2033.
Data transmission is based on the half duplex communication mode. The
control station continuously sends synchronization signals even when there is no
data ready to be dispatched. The RTUs on the other hand only respond to an
explicit request from the control station. Up to 15 RTUs can be connected to a
single communication line.
Data is encoded in 16-bit words with 8-bit use data which together make up a telegram.
on-demand transmission of static signals such as single indications and analogs spontaneous transmission of single indications with time tag direct command transmission (without SBO) clock synchronization
up to 15 RTUs connected to one line single indications: up to 15 files with 128 points each analogs: up to 8 files with 16 points each counter values: up to 4 files with 16 points each commands: up to 15 files with 128 points each
Available Protocol Stacks
Indactic 33/41, 2033, Master
Indactic 33/41, 2033, Slave
Universal protocol converter for small and distributed applications