M2i-LAN Laser-Scanner manual
HB-M2-iLAN-UDP-E.doc
page 5 of 44
MEL Mikroelektronik GmbH, Breslauer Str. 2, 85386 Eching / Germany
www.MELSensor.de
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Up to 32 Scanners could be integrated in a network. Normally, you should use a separate network card for
the connections to the scanner(s). The use of a separate network card is optional and depends from your
network settings, network traffic on the dedicated PC and system load. You may use a Ethernet switch, a
Ethernet cable to each scanner and power supply 10 … 28 V DC.
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The Scanner sends 290 Profile points per Scan with 93.5 Hz :
o
TCP-IP Header
o
M2DF-LAN-Header
o
Profile data
o
Status information
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Reserved Bytes for additional data
o
additional Information as Encoder-Data, FiFO
o
CRC
Each Profile creates a 2048 Byte Block = 93.4 x 2.048 kBytes / s = 191.28 kByte / s.
The network channel has 100 Mbit = 12.500 kBytes / sec
This will allow theoretically maximum = 12.500 / 191 = 65.4 Scanners.
The numbers of collisions in a network rises, when the network load exceeds 50%. Therefore as a realistic
figure, we assume 50 % of maximum transmission rate.
This leads to the number of
32 Scanners
for maximum usage
in one network segment
.
Segmentation of data blocks
Limitations of the network cards like setting of the MTU (Maximum Transfer Unit), and accordingly load in
the network causes that the 2048 Bytes will not be transferred in one packet, but segmented into two
packets of 1460 k and 588 k. The user must not think about this effect, though the TCP implementation of
the operating systems cares about sorting and reconciling the TCP packets. More likely, the software
engineer designing an application must know this and wait long enough to make sure that all packets have
been received, before using the data.
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At the end of the manufacturing test the scanners are set to:
IP address 192.168.123.245
Subnet mask 255.255.255.0.
Before
you integrate these units in your network, you should set the network address to a working address
which will operate in your network properly. For more technical details and background information see the
network tutorial. The set up procedure is given on page 24.
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The scanner head power supply is connected with a 8 pin M12
connector. The control cable has power supply, sync signals, digital
inputs for encoders and control of firmware upload and RS-232 diagnose
interface. The pin definition is given on the next page.
The Ethernet connection is made with a 4 pin M12 connector according
to standard. The Ethernet cable connectors are male.
The connector for the control cable is male. The
controls & power cable
has a female connector and at the other end is either with open leads for
clamps or with a male connector.
