Alexandria Generic Scanner Protocol

TCP-connection from Alexandria (A) to Scanner (S).

S: 220 AGSP (type) (version)
A: SCAN
S: 250 scanned (barcode)
A: ACCEPTED
or
A: REJECTED
or
A: REJECTED (reason)
answer:
S: 211 OK
and again:
A: SCAN
S: 250 scanned (barcode)
A: ACCEPTED
S: 211 OK
A: QUIT
S: 221 (message (e.g. bye))
other responses:
S: 502 (message (e.g. not implemented))
S: 503 (message (e.g. protocol sync error))