Communication Interfaces
8 Rev. B4 Aug 2019 MP150 Protocol
2 Communication Interfaces
The MP150 scanner communicates via RS485 or the Ethernet interface. After scanner start-up, both
interfaces will be active and will remain active. Though two interfaces are available only one should be
used at a time. Using both interfaces at the same time may create undefined results!
For more information about the Ethernet and RS485 interface, see the MP150 manual
“Operating Instructions”!
2.1 Ethernet
2.1.1 Keep Alive Time
The scanner has built-in support for keepalive. The procedures involving keepalive use three user-
driven variables:
• tcp_keepalive_time: the interval between the last data packet sent (simple ACKs are not
considered data) and the first keepalive probe; after the connection is marked to need
keepalive, this counter is not used any further.
• tcp_keepalive_intvl: the interval between sub sequential keepalive probes, regardless
of what the connection has exchanged in the meantime.
• tcp_keepalive_probes: the number of unacknowledged probes to send before
considering the connection dead and notifying the application layer.
The default values are: 240 10 6; which mean after 240 seconds the scanner will send 6 probes with an
interval of 10 seconds, so after 5 minutes a broken connection will be closed.
2.1.2 BootP
Getting the IP-Address via BootP – the BootP Client
Since firmware version 3.43 a BootP client is “asking” for an IP-address if no connection was established.
The implantation is done following the RFC 951 Bootstrap Protocol.
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