About This Manual ................................................................................................................................... 1
This manual is intended for use by service technicians
™
920i
responsible for installing and servicing
digital
diagnostic junction boxes. This manual applies to
Version 2145 or later of the
Version 2.05 or later of the
Configuration and calibration of the
accomplished using the
iQUBE software and
920i indicator software.
iQUBE can be
Revolution III configuration
utility.
For installations using the
can be configured using the
920i indicator, the indicator
Revolution III or iRev
™
configuration utilities, serial commands, or the 920i
indicator front panel keys.
1.0Introduction
The iQUBE is a digital programmable junction box
used to connect up to 16 full bridge analog load cells.
iQUBE outputs a serial stream that can be directly
The
input to the
Ethernet cabling. Alternatively, the
configured to provide an analog output signal for
input to standard digital weight indicators.
The
iQUBE is available in three models:
•Four-channel
•Eight-channel
•Eight-channel with eight digital I/O channels
The basic
•The connector board provides the physical
•The core module, which plugs into the
Up to four
as a multidrop RS-485 network, consisting of one
primary and up to three secondary
maximum number of load cells supported for the
indicator is 16. Up to four individual weighing
platforms can be configured for a scale system.
The
iQUBE can be configured and calibrated through
920i indicator (Version 2.05 or later), the 920i’s
the
iRev configuration utility, or by using the iQUBE
module of the Revolution III configuration utility.
920i indicator using copper, fiber-optic, or
iQUBE can be
iQUBE consists of two boards:
connections for the load cells, serial
communications, analog output, and digital
I/O.
connector board, contains the
iQUBE’s
processor and stores configuration and
calibration data for the
iQUBE. The core
module provides a discrete A/D for each
channel input and converts the analog load
cell signal to a digital serial output.
iQUBE units can connect and commun ic ate
iQUBE units. The
920i
Some procedures described in this manual
require work inside the
enclosure. These procedures are to be
performed by qualified service personnel
only.
iQUBE or indicator
Authorized distributors and their employees
can view or download this manual from the
Rice Lake Weighing Systems distributor
www.rlws.com.
site at
iQUBE Options
Options for the iQUBE include the following;
Internal power supply: The 6 VDC power supply
mounts inside the
iQUBE enclosure and requires a
115/230 VAC input. This option is required for
applications that do not use the
920i applications that use more than two iQUBE units,
the distance between the
920i and the master iQUBE is
920i indicator and for
more than 75 feet, or the fiber optic modules are used.
Analog output: This option consists of a DAC card
that mounts on the core module and converts the
iQUBE’s digital output stream to 0–30 mV or 0–20
mA (passive only).
Fiber-optic transceiver: This option mounts on the
connector board to convert the
iQUBE’s serial output
into visible light for fiber-optic interface. When used
with the optional power supply, the fiber-optic
interface provides electrical isolation of the
iQUBE
from the host.
Fiber-optic transceiver to analog output: This
option converts digital fiber-optic data received from
the
iQUBE to an analog signal that can be input to the
load cell input of a standard weight indicator.
Ethernet: This option mounts on the connector board
to transfer the
Configuration
iQUBE’ s serial output onto the Ethernet.
There are two methods for configuration, using either
920i indicator as the host (menu or iRev
the
configuration) or by using the Revolution III utility to
configure the
the load cells connected to
iQUBE directly. Each method defines
iQUBE, which load cells
comprise a platform, and which platforms make up
the scale system.
Introduction1
Configuration consists of the following steps:
Define Load Cells: This is the electrical sensitivity
(mV/V output) and capacity specification of the load
cells. Load cell names and serial number can also be
specified.
Define Platforms: A platform is a contiguous weigh
bridge. Any
iQUBE board can assign load cells to two
separate platforms. A maximum of four platforms can
be defined in an
iQUBE system. The relationship
between load cells is also defined as a paired or
circular arrangement.
Define Systems: The platforms can be assigned to a
system. Up to four unique systems can be defined,
however the
920i will only support one system per
serial channel.
Error conditions generate a displayed error message if
connected to the
920i which, with an Ethernet card,
can be configured to e-mail the alert message to an
address. In addition, there is a visual LED indication
on the connector board to identify any load cell that
appears to have an abnormal condition.
Cell Emulation
Cell emulation allows the output of a failed load cell
to be emulated. Automatic or manual cell emulation
can be specified (limited to one cell per scale system),
using either truck scale (Type 1) or tank/hopper/floor
scale (Type 2) emulation algorithms.
NOTE:Satisfactory results from cell emulation require the
load to be centered and the scale installation to be plumb and
level.
Load Cell Trimming and Calibration
Cal-Match™ calibration calculates the load cell trim
based on a comparison of the signal generated by an
applied weight for each load cell to the signal
generated by all other load cells. If a known test
weight value is used, this calibration also sets the span
for the scale.
Three types of Cal-Match calibration can be
performed using the
iQUBE. Each type of calibration
captures the initial dead load of the scale and provides
a means to trim the outputs of the load cells.
Cal-Match Theoretical calibration allows each cell
to be zeroed and trim factors calculated. Based on the
cell capacity and sensitivity, the
iQUBE calculates
weight values based on the total signal from all of the
cells.
Cal-Match Section calibration requires a weight to
be placed over each section. Trimming can be
performed by running a weight cart down the middle
of the platform, stopping for calibration of each
section.
Corner calibration requires weight to be placed over
each cell individually. Corner trimming can be
performed for platforms using an even or odd number
of cells.
Diagnostics (Error 2)
Diagnostic functionality can be enabled for the iQUBE
to identify abnormal load cell outputs. This is based
on the reference established through cell associations.
The diagnostic conditions that can be identified for
paired configurations are open bridge or channel, zero
reference tolerance, drifting, peak-to-peak noise, and
out-of-balance conditions. Diagnostic conditions
recognized for circular configurations are limited to
open bridge or channel, drifting, and peak-to-peak
noise.
1.1System Configurations and Options
Table 1-1 lists iQUBE model and option part numbers.
920i part numbers listed are for models without A/D
cards.
Model / OptionPN
4-channel iQUBE
8-channel
8-channel
iQUBE internal power supply, 6 VDC
iQUBE internal Ethernet interface
iQUBE internal fiber-optic interface
920i internal fiber-optic interface
920i internal Ethernet communications card
920i Serial option card
Remote (external) fiber-optic interface77789
Analog output, 0–30 mV77146
Analog output, 0–20 mA (passive)77797
920i universal model, 115 VAC
920i universal model, 230 VAC
920i deep enclosure, wwithout A/D model,
115 VAC
920i deep enclosure, wwithout A/D model,
230 VAC
920i panel mount model, 115 VAC
920i panel mount model, 230 VAC
920i wall mount model, 115 VAC
920i wall mount model, 230 VAC
iQUBE
iQUBE with digital I/O
Table 1-1. iQUBE Model and Option Part Numbers
92391
92392
92393
77531
77142
77143
77788
71986
67604
77790
77791
93243
93244
77792
77793
77794
77795
2iQUBE Installation Manual
2.0Installation
This section describes procedures for connecting load
cell, analog output, power, and serial communications
cables to the
drawings and replacement parts lists for the
are included for the service technician.
2.1Unpacking and Assembly
Immediately after unpacking, visually inspect the
iQUBE to ensure all components are included and
undamaged. The shipping carton should contain the
iQUBE, this manual, and a parts kit. If any parts were
damaged in shipment, notify Rice Lake Weighing
Systems and the shipper immediately.
See Section 2.16 on page 16 for parts kit contents.
2.2Mounting the Enclosure
The iQUBE can be mounted either vertically or
horizontally to a flat surface.
2.3Cable Connections
All models of the iQUBE provide ten cord grips for
cabling into the unit, plus a dedicated cord grip for a
ground wire. Up to eight load cells can be cabled into
iQUBE; other cord grips allow cabling for serial
the
communications, analog output, digital I/O, and AC
power. Install plugs in all un us ed co rd grips to prev ent
moisture from entering the enclosure.
iQUBE junction box. Assembly
iQUBE
Use a wrist strap to ground yourself and
protect components from electrostatic
discharge (ESD) when working inside the
iQUBE enclosure.
Channels 1–4
iQUBE
ConnectorCell Name
J12A1J16A5
J13A2J17A6
J14A3J18A7
J15A4J19A8
NOTE: For secondary
with B, C, or D.
Table 2-1. iQUBE Connector and Load Cell Names
iQUBE units, the A prefix is replaced
Channels 5–8
(8-channel units only)
iQUBE
ConnectorCell Name
Figure 2-1 shows two exa mples of load cell naming
for eight-cell platforms. While load cells can be wired
to any connector on the
iQUBE connector board,
platforms defined as using “paired” sections
(including most truck scale applications) must
correctly associate these pairs to ensure valid
calibration and diagnostic functions.
In the top example of Figure 2-1, the even/odd load
cell wiring scheme requires cells A1/A2, A3/A4, A5/
A6, and A7/A8 to be associated as section pairs. In the
lower example, the sequential wiring requires pair
associations for A1/A8, A2/A7, A3/A6, and A4/A5.
Pair association is set in the platform configuration for
the scale.
A1
A3
A5
A7
2.4Load Cells
When wiring load cells, cells wired to iQUBE
connectors J12–J19 (8-channel units) are assigned
default names A1–A8 (8-channel primary unit) or
B1–B8 (8-channel secondary unit). Be aware that
graphic representations of the weighing platform
shown when configuring the scale assume particular
locations for each load cell, based on the
connector used (see Table 2-1). Load cells can be
renamed during configuration.
iQUBE
A2
A4A8
A6
A1A2A3A4
A8A7A6A5
Figure 2-1. Load Cell Pairing for Eight-Cell Platforms
Installation3
+SIG
1
–SIG
SHLD
JP1 is located on the back
side of the core module
1
+SIG
–SIG
+EXC
LOAD CELL 1
–EXC
J12
SHLD
1
+SIG
–SIG
+EXC
LOAD CELL 3
–EXC
J14
SHLD
1
+SIG
–SIG
+EXC
LOAD CELL 5
–EXC
J16
SHLD
1
+SIG
–SIG
+EXC
LOAD CELL 7
–EXC
J18
SHLD
INPUT/OUTPUT LEDs:
OUTPUT: GREEN = RELAY ON
INPUT: GREEN = SWITCH CLOSED
1
+SIG
–SIG
+EXC
LOAD CELL 2
–EXC
J13
SHLD
1
+SIG
–SIG
+EXC
LOAD CELL 4
–EXC
J15
SHLD
1
+SIG
–SIG
+EXC
LOAD CELL 6
–EXC
J17
SHLD
1
+SIG
–SIG
+EXC
LOAD CELL 8
–EXC
J19
SHLD
J21
IO 8
DAC
C44
C72
C47
C73
C50
C74
C53
C56
C76
C59
C62
C78
C65
8-CHANNEL
MODELS ONLY
IO 7
IO 6
IO 5
IO 4
DIGITAL I/O
ON
123 45678
DIP SWITCH / S1
4-Channel
C75
C77
8-Channel
C79
CORE MODULE
J8
ANALOG 2
1
+SIG
GND
+PWR
IO 3
IO 2
IO 1
1
J20
1
DIGITAL I/O
MODEL ONLY
J6
1
J4
Serial LEDs
JP1
D7
D5
D8
D6
1
EXPANSION MODULE
CELL STATUS LEDs
D1
C1C2 C3C4
C5C6 C7C8
Version
Label
J3
1
LED EXTENSION
SW1
SETUP
J2
J3
PIN 1
J9
ANALOG 1
SHLD
+SIG1–SIG
–SIG
SHLD
BOARD POWER
+PWR
OFFON
F1
J10
1
GND SHLD
FIBER-OPTIC OR
GREEN =
POWER ON
J11
SECONDARY
POWER
1
GND SHLD
+PWR
ETHERNET
OPTION
J7
B
Y
Z/TXDA/RXD
GNDSHLD
1
GND SHLD
ZB
Y
1
A
J4
Figure 2-2. iQUBE Connector Board (8-channel with Digital I/O) with Core Module and DAC Card
Load Cell Wiring
T o attach load cell cables to the connector board, route
the cables through the cord grips on the load cell
connector end of the
iQUBE enclosure. Note the load
cell numbering assigned to the connectors (see
Figure 2-2).
Strip 1/4-inch of insulation from the ends of the load
cell wires. Use the cable clamp tool included in the
parts kit to open the connector springs and install
wires into the connectors. Wire load cell cables as
shown in Table 2-2.
When connections are complete, use cable ties and
mounts to secure the load cell cables to the inside of
the enclosure.
4iQUBE Installation Manual
Load Cell Connector
Pins (J12–J19)
Function
1+SIG
2–SIG
3+EXC
4–EXC
5SHIELD
Table 2-2. Load Cell Connector Pin Assignments
2.5Serial Communications
The J4 and J7 serial communications ports on the
iQUBE connector board support communications
between the
PC) or other
•Port J7 supports full-duplex RS-232 or
NOTE: Four-wire RS-485 communications with
the
card in the indicator. See Table 2-4.
•Port J4 supports full-duplex RS-485
To attach serial communications cables, route the
cable through the cord grip and wire to the connector.
Use cable ties to secure serial cables to the inside of
the enclosure.
Table 2-3 sho ws the pin assignments for connectors
J4 and J7. See Section 2.6 for information about
wiring for secondary units.
Connector PinSignal
J7
J4
iQUBE and a host device (indicator or
iQUBE units.
four-wire RS-485 communications between
the primary
iQUBE unit and a host device.
The communications protocol (RS-232 or
RS-485) and port used to communicate with
the host device are selected by setting DIP
switches on the core module (see Section 2.9
on page 10).
920i requires installation of the serial option
Port J7 is also used by secondary
iQUBE units
to connect to the master and secondary unit.
communication between the primary
iQUBE
unit and any secondary iQUBE, and between
successive secondary units (see Section 2.6).
1SHIELD
2GND
3Z / RS-232 TxD
4Y
5B
6A / RS-232 RxD
1A (RS-485 +RxD)
2B (RS-485 –RxD)
3Y (RS-485 +TxD)
4Z (RS-485 –TxD)
5GND
6SHIELD
Table 2-3. Serial Port Pin Assignments
RS-485 Connections to Host 920i
Table 2-4 shows the connections needed for RS-485
communications between a host
920i serial expansion card, PN 67604, must be
The
920i and the iQUBE.
installed in the indicator for 4-wire RS-485
communications with the
920i Serial Option Board
J2 Connector
RS-485 SignalPinPinRS-485 Signal
+RxD14+TxD (Y)
–RxD23–TxD (Z)
–TxD35–RxD (B)
+TxD46+RxD (A)
Table 2-4. RS-485 Connections for 920i Host
NOTE: RS-485 is only supported on Port A of the
iQUBE.
iQUBE
J7 Connector
2-channel expansion board.
Communications Cable Distance Limitations
The maximum cable lengths that can be used for
various communications types depend on a number of
factors. These include: output impedance of the
transmitter; electrical noise in the environment; cable
capacitance, gauge, termination, and shielding.
Given that these and other factors will affect the
maximum usable cable length, the following distances
can be used as a general guide for
iQUBE
communications cabling:
RS-232:50 ft (15 m)
RS-485:1000 ft (300 m) (Twised pair cable)
Fiber-optic: 500 ft (150 m)
2.6Primary/Secondary Configuration
Up to three iQUBE junction boxes can be configured
as secondary units controlled by a primary
unit. Figure 2-4 on page 7 shows the
primary-to-secondary wiring for multiple
units. Successive secondary units are wired in parallel
(A to A, B to B, and so on) as shown in Figure 2-5 .
NOTES:
•120Ω termination resistors (included in parts
kit) must be installed across the A and B
terminals on the J4 connector of the primary
unit and between the A and B terminals on the
J7 connector of the last secondary unit (see
Figure 2-4 on page 7).
•All six wires, including shield and ground
wires, must be connected between the
communicating
iQUBE units.
iQUBE
iQUBE
Installation5
DIP switches on the core module of each iQUBE must
be set to indicate whether the unit is a primary or
secondary, the communication protocol and port used,
and the secondary address.
•For the primary unit, DIP switches 1–3 must
all be set OFF. Set switches 5 and 6 based on
the protocol (RS-232 or RS-485) and port (J7
or J6) used to communicate with the host
device.
•For secondary units, DIP switch 5 must be set
ON; use switches 1–3 to set the secondary
address as shown in Table 2-5.
RS-232 to
Host PC (920i)
RS-232
DIP
Switch
1–3OFF, OFF, OFFON, OFF, OFF = SECONDARY1
5RS-232 = OFF
6OFF = J7
Primary UnitSecondary Unit
OFF, ON, OFF = SECONDARY2
ON, ON, OFF = SECONDARY3
The iQUBE junction box is available with support for eight channels of digital I/O.
Digital inputs can be set to provide many indicator functions, including all keypad functions. Digital inputs are
active low (0 VDC), inactive high (5 VDC).
Digital outputs are typically used to control relays that drive other equipment. Outputs are designed to sink,
rather than source, switching current.
Each output is a normally-open collector circuit, ca pable of sinking 25 mA when active. Digital outputs are wired
to switch relays when the digital output is active (low, 0 VDC) with reference to a 5 VDC supply. Auxiliary
power is available at connector J20 (see Figure 2-2 on page 4).
Table 2-6 shows the pin assignments for connector J21.
J21 PinJ21 Signal
1I/O 1
2I/O 2
3I/O 3
4I/O 4
5I/O 5
6I/O 6
7I/O 7
8I/O 8
Table 2-6. J21 Pin Assignments (Digital I/O)
Digital inputs and outputs for the
920i indicator are configured using the DIG I/O menu.
8iQUBE Installation Manual
2.8Analog Output
The analog output option consists of either a 0-30mV (PN 77146) or 0-20mA (PN 77797) digital-to-analog
(DAC) card that plugs into the
standard junction box, allowing connection to standard indicators. A 0–20 mA (passive only) DAC is also
available for PLC applications. the 0-20mA and the 0-30mV DAC cards connect to J4 on the
module. See Figure 2-6 for J4 location.
NOTE: Analog output setup information is supplied with the 920i, VIRTUi, or Revolution III technical
documentation.
Analog output from the
iQUBE is sent to connector J9 on the connector board (see Figure 2-2 on page 4). See
Section 2.14.1 on page 15 for more information about installing the analog output option.
PLC
Analog Input
N104
iQUBE core module. The 0–30 mV output simulates the output of a load cell or
iQUBE core
+IN
J9
1
-IN
+SIG
–SIG
SHLD
ANALOG 1
Power Supply
+24
+24V Ret
Brown capacitor
150
CORE MODULE
Figure 2-6. 0-20mA Analog Output Wiring
Figure 2-7. 0 - 30mV and 0 - 20mA Converters
ON
J4
DAC
Connection
Installation9
2.9Core Module DIP Switches
The DIP switches on the iQUBE core module must be
set to configure the
unit, and to specify the type of serial communications
provided by the unit. Table 2-7 lists the DIP switches
and their functions.
SwitchFunctionVal ues
1–3Primary/
secondary
address
4Setup enable/
disable
5Host
communication
protocol
6Host
communication
port
7Reserved—
8Load defaultLoad default configuration on
iQUBE as a primary or secondary
OFF, OFF, OFF = PRIMARY
ON, OFF, OFF = SECONDARY1
OFF, ON, OFF = SECONDARY2
ON, ON, OFF = SECONDARY3
OFF = setup disabled
ON = setup enabled
OFF = RS-232
ON = RS-485
OFF = Port J7
ON = Port J6
power-up (see Section 2.10)
Table 2-7. Core Module DIP Switch Settings
2.10Core Module Reset Procedure
To reload the default firmware into the iQUBE core
module, do the following:
1. Power-off the
units can be powered off by temporarily
removing fuse F1 (see Figure 2-2 on page 4).
2. Set core module DIP switch 8 ON.
3. Power-on the
core module, to cycle from red to green or
green to red several times, then off.
4. Power-off the
5. Set DIP switch 8 OFF.
6.Power-on the
iQUBE. Remotely powered
iQUBE. Allow LED D1, on the
iQUBE.
iQUBE. The reset is now complete.
10iQUBE Installation Manual
2.11iQUBE Communications Configurations
The following sections describe some of the ways digital or analog output from the iQUBE can be connected to
weight indicators.
2.11.1Copper-Wire Connection to the 920i
A basic configuration of the iQUBE is shown in Figure 2-8. A single 6-conductor load cell cable can be used both
to supply 6 VDC power to the
included in the
page 14).
iQUBE parts kit are used to tap power from the indicator power supply (see Sect ion 2.12 on
NOTE: Applications using more than two iQUBE units must use the iQUBE’s optional internal power
supply.
iQUBE and to exchange serial data with the 920i indicator. Tap and run connectors
Figure 2-8. iQUBE Copper Wire Connection to 920i, Showing RS-232 and DC Power Connections
2.11.2Fiber-Optic and Ethernet Communications
Both fiber-optic and Ethernet communications cards are available for the iQUBE. Figure 2-9 shows an iQUBE
unit with the fiber-optic card and the optional internal power supply installed.
An internal fiber-optic module for the
between the
iQUBE and the 920i. The optional remote fiber-optic interface can also be used to convert digital
data carried on a fiber-optic cable from the
920i (see Figure 2-18 on page 16) allows direct fiber-optic communication
iQUBE to an analog signal for any weight indicator.
Figure 2-9. iQUBE Fiber-Optic Connection to 920i or Remote Fiber Module
Installation11
2.11.3Remote Fiber-Optic Module (PN 77789)
The optional remote fiber-optic module provides optically isolated digital-to-analog (DAC) conversion of digital
data received from the
iQUBE. The analog output from the module can be connected to the analog (load cell)
signal input of a standard weight indicator that can read 0-30mV (0-20mA) referenced to ground (see
Figure 2-10).
This option requires that the
iQUBE be fitted with its internal fiber-optic card (see Figure 2-9 on page 11); both
voltage- and current-based DAC cards available for the remote fiber-optic module.
J5
DAC
J3
FIBER-OPTIC
INTERFACE
V1
V1A
V2A V2
AC
POWER
IN
POWER
SUPPLY
J4
ANALOG
OUTPUT
J1
POWER
IN
ANALOG OUTPUT
TO INDICATOR
Figure 2-10. Remote Fiber-Optic Module
Figure 2-11 shows connector locations on the remote
fiber-optic interface.
(BLACK)
DAC
J5
FIBER-OPTIC
J3
INTERFACE
J4
ANALOG
OUTPUT
GND
–OUT
+OUT
V1
(BLUE)
V2
TRANSMITTER
J1
POWER
IN
+V
GND
FIBER-OPTIC INPUT
FROM iQUBE
Figure 2-11. Remote Fiber-Optic Interface, Including DAC
12iQUBE Installation Manual
2.11.4Analog Output
The analog output from the iQUBE can be connected to the analog signal inputs of any weight indicator that can
be read 0-30mV (0-20mA) referenced to ground (see Figure 2-12). Analog output from the
digital-to-analog (DAC) card be installed on the
iQUBE core module. Both voltage- and current-based DAC
iQUBE requires that a
cards are available. See Section 2.14.1 on page 15 for more information about DAC card installation.
NOTE: Analog output wiring must include ground wire (pin 3 on connector J9 on the iQUBE connector board).
Figure 2-12. iQUBE Analog Output Connection to Indicator
Installation13
2.12Installing Tap and Run Connectors for 920i Power
iQUBE installations that are remotely powered by the
920i indicator, and those that use the 920i internal
fiber-optic module, require tap and run connectors to
draw power from the
920i power supply (see Figures
2-13 and 2-14).
To install tap and run connectors in the
920i indicator,
do the following:
1. Place red (+6V) wire from
920i power supply
inside the run channel of the tap and run
connector. The cable tie used to secure the
power supply wires may need to be cut to allow
sufficient slack in the wires.
POWER SUPPLY
2. Close side cover of connector until latched.
3. Insert tap wire (+6V supply to
connector. Use inspection port to check wire
position.
4. Use crimping tool to drive u-contact down flush
with top of connector. Close hinged top cover
until latched.
5. Repeat procedure for green (GND) wire tap and
run connector.
6. Use cable ties to secure power supply wires
inside the enclosure.
WARNING!
HIGH VOLTAGE
DISCONNECT POWER BEFORE SERVICING
iQUBE) into
J8
TAP AND RUN
CONNECTORS
GREEN (GND)
RED (+6V)
Figure 2-13. 920i Tap and Run Connector Installation
POWER SUPPLY
FIBER-OPTIC
INTERFACE
V1
V2
J4
J8
J3
TAP AND RUN
CONNECTORS
GREEN (GND)
RED (+6V)
Figure 2-14. 920i Tap and Run Connector Installation for Internal Fiber-Optic Interface
See Section 2.14.4 on page 16 for more information about installing the 920i internal fiber-optic interface.
14iQUBE Installation Manual
Loading...
+ 37 hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.