FingerVein Online
Installation and Programming Manual
Page
30 of 69
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$0E
-
TCP_TimeOut
: This is a byte that encodes the time in seconds between
transmission retries. In other words, after the transmission of a frame, the
FingerVein Online electronics will wait for Acknowledgement from the Host during
TCP_TimeOut
seconds. After this time, the frame will be resent up to 3 times. After
3 failed retries, the FingerVein Online electronics will close the TCP/IP socket. This
same parameter controls the
KeepAlive
frame of the FingerVein Online electronics:
every
10 x
TCP_TimeOut
seconds, the FingerVein Online electronics will send a
frame with the ASCII $06 byte to check that communications with the Host remain
valid. If the frame
KeepAlive
is not acknowledged after 3 retries, the Socket will
also be closed.
If
TCP_TimeOut
is 0, no retries are made,
KeepAlive
frames are not generated and the
socket can only be closed from the Host.
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$0F
-
KSP-Address_Low
: This byte encodes Node_ID in a KSP network. It would be
equivalent to the 8 bit DIP-Switch of Kimaldi CAN system products.
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$10
-
CFG_ePHY
: This byte allows for the type of Ethernet connection available for
our electronics to be consulted and specified in advance.
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$1F
-
KSPPort-RemoteHost:
Four BCD digits that indicate the Host port through
which communications with FingerVein Online electronics will be established (
6001
and it requires a value other than
0000
.
It is important to remember that changes in the IP configuration will not take effect until
after the machine is restarted, which can be done by simply sending the
instruction.
8.2.1. ePHY configuration
During the start-up phase and before starting IP communications, the FingerVein Online
electronics must negotiate the transmission speed to the subnetwork where it is
connected. The process is as follows:
1. Self-negotiation: this allows for connection to 10 BaseT or 100 BaseT, Half-Duplex.
2. Manual negotiation to 100 BaseT, Half-Duplex.
3. Manual negotiation to 10 BaseT, Half-Duplex.
4. Let us assume that there is no available IP connection. PHy is configured to 100
BaseT.
application, the Ethernet connection should be renegotiated, which
could last a few seconds in the worst case scenario (where there is no Ethernet
connection). The correct configuration of the $10 parameter (
CFG_ePHY
) allows for the
electronics start-up time to be optimised.
