[Koha] protocol used to manage bookcheck unit? (hardware product)

[Gerard Henry]

hello all,
we are looking at a new bookcheck unit from 3M (model 942), coupled with 
koha.
Unfortunately, this model comes with Windows software, while we want use 
it from linux/unix.
Reading the rare docs, i notice that 3M talks about codes sent by ILS, like:
DDD
RRR
SSS

Anybody knows what it means? Is it a known protocol? The 3M software 
seems to use serial line to interact with the bookcheck unit, so i guess 
it is a simple protocol.

Thanks in advance for help,

gerard
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