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Example of uLINK HUB wiring located inside the uLINK bus
return resistance. Never cross data wires, A can be connected only to A and B to B, regardless if you are
connecting additional hub or module.
NOTE: uLINK network has no input or output, it is
a bus. It has only two ends and both must be
terminated. All R terminals are connected
together internally but isolated from ground, the
power supply - pole (return) and earth terminal.
uLINK HUB is a powered device it requires a 12-
15V DC power supply.
Additional uLINK HUBs must be used to connect
more then four (4) SMD into the network. These
additional hubs can be placed anywhere on the
uLINK bus. By default, each uLINK HUB has by
bias biasing resistors connected to the A-B bus
wires. Since only one hub may provide bias to
the bus, the bias must be disconnected by
opening two jumpers on the bottom boards of the
additional hubs.
If the uLINK bus contains more than one uLINK
HUB, each must be powered separately. Avoid
daisy chaining of power leads, connect each
separately to the power supply.
IMPORTANT: Always open the bias jumpers on
additional uLINK HUBs. No damage will occur
but communication will be not reliable or may not
work at all.
IMPORTANT: Never open the bias jumpers if
there is only one uLINK HUB, communication will
be not reliable or may not work at all.
IMPORTANT: Ground every uLINK HUB with
separate ground lead from the ground terminal to
the central ground point in the station.
microHAM © 2016 All rights reserved
Example of two linked uLINK HUBs for six (6) SMD ports
95
CAT5 wire color
Orange
Orange/White
Blue
Blue/White
Green
Green/White
Brown
Brown/White
Shield
IMPORTANT: When connecting uLINK HUB to
the uLINK network, always use two twisted pairs
of CAT5/6 cable. One pair use for data A and B
terminals and one pair connected in parallel for
return R terminal. Unused pairs can be
connected in parallel to R terminal for lower
uLINK HUB terminals
A
B
R
R
R or N/C
R or N/C
R or N/C
R or N/C
SH or Earth
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