nomad LK4-2 User manual

OPERATION MANUAL
FOR
LK4-2
LINK UNIT

NOMAD - LK4 -2
O
PERATING
I
NSTRUCTIONS
P
AGE
2 of
2
1. IMPORTANT INFORMATIO N ................................................................ ............................... 3
2. INTRODUCTION ................................................................ ................................ ................... 3
3. SPECIFICATION ................................................................ ................................ ................... 3
3.1 CERTIFICATION ................................................................................................ .......................... 3
3.2 CABLE LENGTHS ................................ ........................................................................................ 4
3.2.1 12V DC POWER CABLING ................................ ................................................................ ..... 4
3.2.2 Network Cabling ................................................................................................ ....................... 4
4. INSTALLATION ................................................................................................ ..................... 5
4.1 M
OUNTING
................................................................................................................................ ...... 5
4.2 C
ONNECTIONS
................................................................................................................................ 5
4.3 N
ETWORK
I
DENTIFIER
................................ ................................ ................................ ...................... 6
4.4 A
NTENNA
........................................................................................................................................ 7
5. MAINTAINENCE ................................................................ ................................ ................... 7

NOMAD - LK4 -2
O
PERATING
I
NSTRUCTIONS
P
AGE
3 of
3
1. IMPORTANT INFORMATIO N
FCC ID:
OOALK4 -2
This device complies with part 15 of the FCC rules. Operation is subject to
the following two conditions:
(1) This device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause
undesired operation.
Warning! Any modification or changes made to this device, unless explicitly
approved by Maynetronics Limited, will invalidate the authorisation of this
device. Operation of an unauthorised device is prohibited under Section 302
of the Communications Act of 1934, as amended, and Subpart I of Part 2 of
Chapter 47 of the code of Federal Regulations.
2. INTRODUCTION
The LK4-2 link unit is a remote transceiver for the NOMAD system. Its
purpose is to provide the radio link to wi reless NOMAD terminals.
Several of these link units can be connected to the same controller via a
single twisted pair cable. Each link unit is powered from a 12V DC supply.
3. SPECIFICATION
Power 10 -18V DC
Average Consumption 100mA
Radio link
Fre quency 915MHz
3.1 CERTIFICATION
This device complies with part 15 of the FCC rules. Operation is subject to
the following two conditions: (1) this device may not cause harmful

NOMAD - LK4 -2
O
PERATING
I
NSTRUCTIONS
P
AGE
4 of
4
interference, and (2) this device must accept any interference received,
includ ing interference that may cause undesired operation.
3.2 CABLE LENGTHS
3.2.1 12V DC POWER CABLING
When fitting the link unit ensure that the voltage at the link unit is in the
range 10 to 18 V DC. Voltage drop between the power supply and the link
units will depend on the cable used and the number of link units connected
to a single power supply.
The following table gives maximum cable lengths for some common
configurations. Note that the cable length is from the power supply to the
farthest link unit for a single cable run. It would be normal practice to make
two or more cable runs from a single power supply (in different directions).
12V DC supply:
# Of Link Units 1.0mm
2
1.5mm
2
1 171 256
2 133 199
3 108 163
4 92 138
15V DC supply:
# Of Link Units 1.0m m2 1.5mm
2
1 427 641
2 332 499
3 272 408
4 230 345
3.2.2 Network Cabling
The maximum cable length for the network cable is dictates the distance
from the controller to the farthest link unit. This is typically 1km. Note that if
the controller is centrallly placed this gives a maximum distance from one
end to the other of 2km.

NOMAD - LK4 -2
O
PERATING
I
NSTRUCTIONS
P
AGE
5 of
5
4. INSTALLATION
The LK4 - 2 has been designed to be permanently installed
4.1 MOUNTING
Whilst the general location for each link unit will be dictated from a system
viewpoint individual link units should adhere to the following guidelines
1. Avoid mounting adjacent to metal pillars etc.
2. The antenna should have a vertical orientation.
It is usual to mount the link unit suspended over a main path with the
antenna pointing vertically downwards. A fixing kit is supplied that assists in
attaching the link unit to parallel overhead support wires, see figure 1 at the
end of this manual.
4.2 CONNECTIONS
The network connection should be made using screened twisted pair cable
with a characteristic impedance of 110 . When connecting multiple link
units to a single controller each item of equipment (link unit or controller)
should be daisy chained - the cable starts at one item and then goes to the
next, and then the next and so on. Do not use a star configuration - one item
has connections running from it to more than two other items.
The last two items, and only the last two items, in the chain should have their
terminators switched on. For the link units this is achieved by sliding switch
SW2 to the left - see above.

NOMAD - LK4 -2
O
PERATING
I
NSTRUCTIONS
P
AGE
6 of
6
Take care on 12V DC powered units to observe the correct polarity.
Cables connected to the link unit should be fixed so that any moisture
running down the cable does not is directed away from the link unit. All
glands must be tightened - any unused glands should be fitted with a
blanking plug.
4.3 NETWORK IDENTIFIER
To enable a link unit to be identified from other link units on the network a
unique number is assigned to it using switch SW1
Set the switch as follows (0 is down, 1 is up)
Identifier Setting Identifier Setting
0 000000 16 010000
1 000001 17 010001
2 000010 18 010010
3 000011 19 010011
4 000100 20 010100
5 000101 21 010101
6 000110 22 010110
7 000111 23 010111
8 001000 24 011000
9 001001 25 01 1001
10 001010 26 011010
11 001011 27 011011
12 001100 28 011100
13 001101 29 011101
14 001110 30 011110
15 001111

NOMAD - LK4 -2
O
PERATING
I
NSTRUCTIONS
P
AGE
7 of
7
Note that switch SW1 position 6 (leftmost) is reserved for factory test mode
and should be in the 0 (down) position for normal use.
4.4 ANTENNA
Screw the antenna directly into the link unit as per figure 1.
Never attempt to use a cable to extend the antenna or mount it remotely
from the link unit.
Never connect anything over than the supplied antenna to the antenna port.
5. MAINTAINENC E
The link unit is designed to give maintenance free service.

NOMAD - LK4 -2
O PERATING I NSTRUCTIONS
P AGE 8 of 8
NETWORK DATA CABLE
IN AND THROUGH
LINK UNITS SHOULD BE CENTRALLY MOUNTED
ABOVE MAIN PATH. AVOID MOUNTING ADJACENT
TO METAL POSTS WHERE POSSIBLE. ANTENNA
SHOULD POINT VERTICALLY DOWNWARDS.
ANTENNA PORT
SUSPENSION WIRES
OPTIONAL SUSPENSION WIRE
FIXING KIT
Figure 1 - suspension mounting