Peekel Instruments PICAS User manual

PEEKEL INSTRUMENTS B.V
INDUSTRIEWEG 161
3044 AS ROTTERDAM
TEL: [phone]
FAX: [phone]
EMAIL: [email protected]
PEEKEL INSTRUMENTS GMBH
BERGMANNSTRASSE 43
44809 BOCHUM
TEL: [phone]
FAX: [phone]
EMAIL: [email protected]
User
manual
PICAS

Peekel Instruments B.V. User manual PICAS V2.6.1
Page 2 of 59
Contents:
1. Introduction.................................................................4
1.1 Power.................................................................................................................................4
1.2 General ..............................................................................................................................5
1.3 The Carrier Frequency principle ........................................................................................5
1.4 General design principles ..................................................................................................6
2Connecting the instrument........................................7
2.1 Carrier frequency inputs on CA2CF...................................................................................7
2.1.1 Connecting the Transducers..............................................................................................7
2.1.2 About Cable-capacitance...................................................................................................7
2.1.3 Bridgeconnector pinout......................................................................................................8
2.1.4 Full-bridge ..........................................................................................................................9
2.1.5 Half-bridge .......................................................................................................................10
2.1.6 Quarter-bridge using 2-wires ...........................................................................................11
2.1.7 Quarter-bridge using 3-wires ...........................................................................................11
2.1.8 Displacement Transducers ..............................................................................................12
2.1.9 Potentiometer connection ................................................................................................13
2.2 Analog inputs on CA4AI...................................................................................................14
2.2.1 Analog input connector pinout .........................................................................................15
2.2.2 Potentiometer connection ................................................................................................16
2.2.3 Connection of a resistor sensor like a PT100 ..................................................................16
2.2.4 Connection of a voltage signal.........................................................................................17
2.2.5 Connection of a 4 – 20 mA Sensor.................................................................................17
2.2.6 Connection of a 0-20mA Sensor.....................................................................................18
2.2.7 Connection of a Thermocouple element..........................................................................18
2.3 Outputs ............................................................................................................................19
2.3.1 Combined analog output..................................................................................................19
2.3.2 Digital Outputs .................................................................................................................19
2.3.3 Digital Inputs ....................................................................................................................19
2.4 Communication ports.......................................................................................................20
2.4.1 RS232 interface ...............................................................................................................20
2.4.2 USB..................................................................................................................................20
2.4.3 RS485 interface ...............................................................................................................21
2.4.4 Rear panel connections ...................................................................................................22
2.4.5 Option Sum & difference values ......................................................................................23
3Setting-up the instrument........................................24
3.1 General ............................................................................................................................24
3.1.1 Power up..........................................................................................................................24
3.1.2 Presentation of numbers..................................................................................................24
3.1.3 Conventions .....................................................................................................................24
3.1.4 Settings Protection...........................................................................................................25
3.2 Software Installation.........................................................................................................25
3.2.1 Loading new versions of firmware (Updates) ..................................................................25
3.3 Human Interfacing ...........................................................................................................25
3.3.1 Navigating the LCD display and the pushbuttons ............................................................25
3.3.2 Fields ...............................................................................................................................27
3.4 Measuring Display ...........................................................................................................29
3.4.1 Actual value display .........................................................................................................29
3.4.2 Peak value display ...........................................................................................................30
3.4.3 Sum – difference value display.......................................................................................31
3.4.4 Bar graph value display....................................................................................................31
3.5 System-menu’s ................................................................................................................32
3.5.1 System-menu: GENERAL ...............................................................................................34
3.5.2 System-menu: Communication........................................................................................35
3.5.3 System-menu: Actions.....................................................................................................36
3.5.4 System-menu: Memory....................................................................................................37

Peekel Instruments User manual PICAS V2.6.1
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3.5.5 System-menu: Measuring Parameters ............................................................................38
3.5.6 System-menu: Datalog ....................................................................................................39
3.5.7 System-menu: Password.................................................................................................41
3.6 CA2CF channel menu’s...................................................................................................42
3.6.1 CA2CF -menu: GENERAL...............................................................................................43
3.6.2 CA2CF -menu: SENSOR.................................................................................................45
3.6.3 CA2CF -menu: STRAIN...................................................................................................46
3.6.4 CA2CF -menu: RANGE ...................................................................................................47
3.6.5 CA2CF -menu: BALANCE ...............................................................................................48
3.6.6 CA2CF -menu: TRIPS .....................................................................................................49
3.7 CA4AI channel menu’s ....................................................................................................50
3.7.1 CA4AI menu: GENERAL .................................................................................................51
3.7.2 CA4AI menu: Sensor .......................................................................................................52
3.7.3 CA4AI menu: Range........................................................................................................53
3.7.4 CA4AI menu: Tara ...........................................................................................................54
3.7.5 CA4AI menu: Trips ..........................................................................................................55
4Problem resolving ....................................................57
5Technical Specifications..........................................58
Version number 2.7.0
Release date March 2008
Author J.H. Steeneveld

Peekel Instruments User manual PICAS V2.6.1
Page 4 of 59
1. Introduction
1.1 Power
The instrument is powered from an earthed 230 V / 50 Hz mains through a standard euro-
plug.
The power switch is at the rear.
Just below the power switch the fuse of 1A slow is present.
WARNING
Replacing the fuse must be done with
the power cord disconnected, to
prevent
electrical shock hazard
WARNING
Do not open the case. There are no user serviceable
parts inside.
Danger for electrical shock hazard!!

Peekel Instruments User manual PICAS V2.6.1
Page 5 of 59
1.2 General
PICAS is a tabletop stand-alone compact amplifier system from Peekel Instruments B.V.
It can be connected as one node (station) in a larger, decentralized system by using the
integrated RS-485 bus connection.
PICAS is delivered with an LCD-front and pushbuttons for the operation of the system.
The PICAS can be also be connected to a external PC through a RS232 or USB interface.
It is designed to be used for high-accuracy experimental and industrial measurements and
can be used with a variety of Wheatstone bridge-based sensors.
PICAS can hold 2 input cards. These input cards can be the CA2CF or CA4AI cards.
The CA2CF card comprises 2 high-accurate galvanic isolated carrier frequency amplifier
channels each with its own analog output. On these channels a variety of resistive
straingauge configurations can be connected for experimental materials testing. Also Load
cells can be connected for industrial weighing and force measurements. LVDT’s (Linear
Variable Differential Transformers) can be used for measuring linear or angular
displacements and also Capacitive Transducers can be connected.
The CA4AI card comprises 4 input channels for voltage, current or resistor measurements.
PICAS contains a control board which comprises a microprocessor which controls the
amplifier settings, keyboard and display handling and the communication to external
systems through the serial communication channels.
1.3 The Carrier Frequency principle
High-accuracy measuring at the output of passive transducers is usually configured into
some sort of a Wheatstone Bridge circuit which always needs some form of reference
(bridge supply) voltage.
DC bridge supply is by far the most popular for resistive transducers, but when it comes to
the highest sensitivity, DC might introduce different spurious voltages which makes the
measuring unreliable. In the late 50’s PEEKEL already developed the Carrier Frequency
principle for these applications, where an AC voltage is being used for the supply, which
eliminates most of these spurious and misleading signals. Furthermore, AC bridge supply
can be also used together with capacitive and inductive transducers.
If dynamic signals are being measured, the AC bridge supply voltage will be “modulated” by
the measuring signal and by “detecting” this signal, the output signal becomes available.
This way of measuring, through modulation of a carrier frequency with detection in a later
step, is similar to the principle of AM radio. Hence, the term “Carrier Frequency” is being
used.
The inherent use of isolation transformers assures a complete isolation between the
sensing circuit and the rest of the system.

Peekel Instruments User manual PICAS V2.6.1
Page 6 of 59
1.4 General design principles
The following drawings only show the basic principles of the carrier frequency amplifier, as
it is outside the scope of this user’s manual to go in full detail.
Basically, PICAS houses 1 controller board which controls the settings of the amplifiers as
well as the communication with external devices like a PC.
Also PICAS can hold up to 2 input cards, of the type CA2CF or CA4AI or a mix of those
cards.
The carrier frequency Amplifiers
gnd
-IN
+IN
+EX
-EX
1/4
+SE
-SE
IN
ZERO
9p M
Dsub
+
Analog
OUT
Phase
C-BAL
R-BAL
Demodulator
(Detector)
Bandpass
Phase
shifter
Gain-
control
Lowpass
125 uV/V .. 1V/V
Input
Control
5 KHz exc.ref.
Bridge completion
+ EX
-
EX
1/4
SE
240Ω
240Ω
120Ω
350Ω
-IN
The Controller board
The drawing shows the
evident advantage: the two
transformers, fully isolating
the measuring input from the
rest of the system.
The blockdiagram
shows the basic
elements of the central
processor module.
Further hardware
components.
Apart from the basic module,
the PICAS cabinet further
houses the power supply, the
LCD display-module, the front
with integrated pushbuttons and
a backpanel with various input-
and output- connectors.
Analog
amplifiers
controls
5KHz
0.1234
Frontpaneel
Analog
signals
1 2 3 4
Multiplexer
Excitation
reference
FPGA
ADC
Power
regulator
Vin
Unstab.
Digital
sync.
Microprocessor,
Memory,
Communications
RS232
RS485
USB

Peekel Instruments User manual PICAS V2.6.1
Page 7 of 59
2 Connecting the instrument
2.1 Carrier frequency inputs on CA2CF
The following pages show examples of the various options of how to connect various input
signals and transducers to the instrument. Later in this document, further details are given
of how to actually measure these signals.
2.1.1 Connecting the Transducers
The carrier-frequency amplifier is mainly used for straingauges and lvdt’s. They are
connected in full-, half- or quarter-Wheatstonebridge configurations, having 4, 2 or 1
external straingauges, resistors, inductances or capacities respectively. The other arms of
the bridge can be completed with the internal, on-board, ½- and ¼-bridge complementary-
resistors. (As a standard, these are 240 Ωfor 1/2 bridge and 120 Ω for 1/4 bridge.)
The precise value for a half-bridge completion is not important as long as these resistors
are stable and in balance. The value of a quarter-bridge completion resistor, however,
should fairly accurately match the external straingauge, otherwise a too large unbalance
(offset) will be the result.
All drawings show dotted lines, connecting the ± SE with the ± EX lines. These are the sense-
lines and must be connected, even when not 6 but only 4 wires to the straingauge-bridge
are used.
The drawings include polarity-signs within the straingauge-resistors. These indicate the
polarity of the amplifier-output-signal for increasing strain and increasing resistance.
It is strongly recommended to use shielded cables.
2.1.2 About Cable-capacitance
A topic, inherent with the use of CF-amplifiers (contrary to DC-amplifiers) is cable-
capacitance. The capacitance between cables to a straingauge-bridge yields a parasitic
impedance, parallel to the arms of the Wheatstone bridge. Any unbalance in capacitance
may therefore lead to errors in the measured signal.
This becomes crucial in quarter-bridge configurations, where the capacitance comes
directly across one arm of the bridge.
(Example: every 1 meter cabling of 100 pF/meter, connecting a 120 Ωbridge to a 5 kHz
carrier-frequency amplifier, gives rise to 100 µV/V C-signal offset. The carrier-frequency-
amplifier luckily does suppress this C-signal by at least a factor 1000. However, this works
only if the amplifier is not overloaded by the C-signal. The C-signal therefore should not be
more than 4...7 times the selected measurement-range of the amplifier. In the most-
sensitive range of 100 µV/V this would allow for 10 meters of cabling.)
The presence of such a large C-signal is not recommended though. In quarter-bridge
configurations therefore, it is common practice to compensate the capacitance by a fixed
capacitor, built in the other arm (between pins + EX and ¼).

Peekel Instruments User manual PICAS V2.6.1
Page 8 of 59
2.1.3 Bridgeconnector pinout
pin 1 : -EX (-excitation)
pin 2 : +EX (+excitation)
pin 3 : +IN (+input)
pin 4 : -IN (-input)
pin 5 : Gnd (ground)
pin 6 : -SE (-sense)
pin 7 : +SE (+sense)
pin 8 :
pin 9 : 1/4 (quarter-bridge completion resistor, 120 or 350 ohm)
The straingauge-bridges and lvdt’s are connected through 9-pole male DSUB connectors.
The pin connections are shown in the above table. The abbreviations are as follows:
± EX Excitation to the transducers. For the carrier-frequency-amplifier this is an ac-signal
of 0,5 to 5 volt at normally 5000 Hz. Although the polarity-signs do not have a meaning for
this ac-signal, they are used here to indicate the relation with + IN and - IN .
± IN Differential input of the amplifier. Like for the excitation, the polarity-signs wouldn’t
have a meaning if they weren’t used to indicate the relation with + EX and - EX . Connecting
+ EX to + IN and - EX to - IN should give a positive (but overload) outputsignal.
± SE Sense-lines for 6-wire connection of full-bridges. The + SE and - SE connections
have to be connected (see diagrams at the next pages) in order to compensate for the
voltage drop of the EXcitation voltage over the lines, connected to the measuring sensors.
¼Quarter-bridge completion resistor. (120Ωor 350Ω precision-resistor.). A single
external straingauge can be completed by the internal resistors in the other bridge-arms,
available through ¼-pin. The ¼-bridge completion resistor is internally connected to + EX .
With the settings a choice can be made between a 120 Ω or a 350 Ω internal
compensation resistor.
Gnd -ground. At this pin the ground from the system is connected. Normaly this pin is not
used
Screen When a cable is used with a screen, this screen must be connected to the
housing of the connector. For the optimal screening this housing must be metalised.

Peekel Instruments User manual PICAS V2.6.1
Page 9 of 59
2.1.4 Full-bridge
Figure 1 shows the connection of a full straingauge-bridge. This is the most reliable
configuration. The leadwire-resistances affect only the sensitivity of the bridge. For instance
6Ωresistances in both the + EX as well as the - EX wire, connected to a 120Ωbridge, give a
decrease in outputsignal of 9.1%. This can be compensated by using the internal sense
circuit. However, that does not compensate the temperature-influence on the leadwire-
resistance. A temperature-coefficient of 0.4%/°C on 12Ωof copperwire, connected to a
120Ωbridge, will still give 0.04%/°C change in sensitivity. Short, thick cabling is therefore
recommended.
-EX
+EX
9 polig
male Sub D
+SE
-SE
-
IN
+IN
-EX
+EX
-
IN
+IN
5
9
6 1
SIGNAL
Connect cable screen to
connector case.
Figure 1: Full-bridge, 4-wire, straingauge-connection
+SE -EX
+EX
9 polig
male Sub D
+SE
-SE
-IN
+IN
-EX
+EX
-
IN
+
IN
-SE
5
9
6 1
SIGNAL
Connect cable screen to
connector case.
Figure 2: Full-bridge, 6-wire, straingauge-connection

Peekel Instruments User manual PICAS V2.6.1
Page 10 of 59
2.1.5 Half-bridge
Figure 2 shows half-bridge configured straingauges. The ½-bridge completion-resistors are
internally connected to - IN .
-EX
+EX
9 polig
male Sub D
+SE
-SE
+IN
-EX
+EX
+IN
5
9
6 1
Connect cable screen to
connector case.
Figure 3: Half bridge, 3-wire, straingauge-connection
+SE -EX
+EX
9 polig
male Sub D
+SE
-SE
+IN
-EX
+EX
+IN
-SE
5
9
6 1
Connect cable screen to
connector case.
Figure 4: Half bridge, 5-wire, straingauge-connection
The connection of the ½-bridge completion to - IN sets the amplifier for positive gain: so
connecting the + IN signal to + EX gives a positive outputsignal (although in overload).
Half-bridge connections are more critical than full-bridge. The leadwire-resistances in the
± EX -lines are in series with the 2 straingauges, in the Wheatstone bridge. Any slight
unbalance in these leadwire-resistances will give rise to signal-offset. Every 1mΩdifference
in resistance on a 120Ωbridge gives 2 µV/V offset. This may be compensated by use of the
internal balance circuit. However, temperature-influence can not be compensated. Short,
thick cabling is highly recommended

Peekel Instruments User manual PICAS V2.6.1
Page 11 of 59
2.1.6 Quarter-bridge using 2-wires
Application of quarter-bridges is the simplest but least accurate way of measuring. The
leadwires in 2-wire configurations are completely incorporated in one arm of the
straingauge-bridge. Every 1 mΩof cabling-resistance in series with a 120Ωstraingauge, will
directly add 2 µV/V signal-offset, though in practical situations it is more likely to meet
several ohm’s of resistance
-EX
9 polig
male Sub D
+SE
-SE
+IN
-EX
+IN
5
9
6 1
Connect cable screen to
connector case.
Figure 5: Quarter-bridge, 2-wire, straingauge-connection
The internal balance-compensation range is 65 mV/V at 5 volt excitation. This allows for
1.25Ωtotal leadwire-resistance in series with a 120Ωstraingauge. A bridge-voltage of 0.5
volt however gives a 10 times balance-range and enables 12.5Ωleadwire in series with a
120Ωstraingauge.
The temperature-influence on the cable-resistance cannot be compensated. The
temperature- coefficient of copper of 0.4%/°C will give rise to 8.3 µV/V offset-change for
each Ωin series with a 120Ωstraingauge. Short and thick cabling is evidently necessary!
2.1.7 Quarter-bridge using 3-wires
Most of the problems, mentioned before, can be avoided by using the 3-wire connection
method. It adds the resistance of the - EX -leadwire to the external straingauge, and it adds
the resistance of the wire leading to the internal ¼-bridge completion to this internal ¼-
bridge resistance. Only the difference in leadwire-resistance (and connector contact-
resistance) gives signal-offset.
-EX
9 polig
male Sub D
+SE
-SE
+IN
-EX
+IN
5
9
6 1
Connect cable screen to
connector case.
-1/4
1/4
Figure 6: Quarter-bridge, 3-wire, straingauge-connection.

Peekel Instruments User manual PICAS V2.6.1
Page 12 of 59
A similar situation as with the ½-bridge connection method has appeared. Every 1 mΩof
difference in resistance, when using 120Ωstraingauges, gives a change in signal-offset of 2
µV/V. This may be compensated internally by the balance circuit. However, the
temperature-influence cannot be compensated for. Short and thick cabling is again highly
recommended.
2.1.8 Displacement Transducers
LVDT’s, or Linear-Variable-Differential Transformers may be configured as full- or half-
bridges. The connection method for both possibilities is shown in the next figures.
-EX
+EX
9 polig
male Sub D
+SE
-SE
-
IN
+IN
-EX
+EX
-
IN
+IN
5
9
6
1
Connect cable screen to
connector case.
Figure 7: Connection of a full-bridge lvdt.
-EX
+EX
9 polig
male Sub D
+SE
-SE
+IN
-EX
+EX
+IN
5
9
6 1
Connect cable screen to
connector case.
Figure 8: Connection of a half-bridge lvdt

Peekel Instruments User manual PICAS V2.6.1
Page 13 of 59
2.1.9 Potentiometer connection
A potentiometer can be connected as a half bridge, 3 wire connection:
-EX
+EX
9 polig
male Sub D
+SE
-SE
+IN
-EX
+EX
+IN
5
9
6 1
Connect cable screen to
connector case.
Figure 9: Potentiometer connection as a half bridge, 3-Wire
The linearity of the measurement is influenced by the impedance of the potentiometer.
When the potentiometer value is between 120 and 350 Ohm, the linearity of the
measurement is within 0.1 %.
When measuring a Potentiometer based sensor, the mid position of the potentiometer will
be the zero point. Moving the potentiometer to the minimum or maximum position, the
output value will be in the range of –full range to +full range.(-100% to +100%).
Based on the actual input resistance of the CA2CF of about 50K, the following non-linearity
will be present when measuring a potentiometer with a higher value:
potentiometer value linearity
500 ohm 0.15 %
1000 ohm 0.3 %
5000 ohm 1.45 %

Peekel Instruments User manual PICAS V2.6.1
Page 14 of 59
2.2 Analog inputs on CA4AI
The analog DC-inputs are located on the CA4AI card, which can be ordered as a alternative
for a CA2CF card which has 2 carrier frequency channels.
At the back side of PICAS for each CA4AI card 4 detachable screw terminals with each 6
terminals are present, on which the signals/sensors can be connected.
Also each CA4AI cards holds another detachable screw terminals with 2 terminals. On this
terminals an 24VDC/80mA power supply is present which can be used as a power supply
for electronic sensors.
Figure 10: Backside of PICAS with 1 CA2CF-card and 1 CA4AI-card.

Peekel Instruments User manual PICAS V2.6.1
Page 15 of 59
2.2.1 Analog input connector pinout
The following signals are present on the input connector:
pin 1 : + Supply voltage or current
pin 2 : - supply current
pin 3 : + IN (+ Input)
pin 4 : - IN (- Input)
pin 5 : - Supply voltage (0V)
pin 6 : Screen Ground
(Pin 1 is on the left side of each terminal, when one is looking at the rear site of PICAS.
5V
1mA
1
2
3
4
5
6
to chassis
Figure 11: Interne connection of the analog input
Connection pinout of the Power-terminal:
pin 1 : + 24VDC
pin 2 : - 24VDC
(Pin 1 is on the left side of each terminal, when one is looking at the rear site of PICAS.
24V
1
2
+
-
Figure 12: Interne connection of the 24VDC supply
This power supply can deliver 80 mA maximum, and is galvanic isolated from PICAS.

Peekel Instruments User manual PICAS V2.6.1
Page 16 of 59
2.2.2 Potentiometer connection
5V
1mA
1
2
3
4
5
6
screen gnd
Figure 13: Potentiometer connection
2.2.3 Connection of a resistor sensor like a PT100
5V
1mA
1
2
3
4
5
6
screen gnd
Figure 14: Resistor connection
This connection diagram is used with a PT100 sensor.

Peekel Instruments User manual PICAS V2.6.1
Page 17 of 59
2.2.4 Connection of a voltage signal
A voltage signal is directly connected to the signal input terminals of the channel.
5V
1mA
1
2
3
4
5
6
to chassis
V
Figure 17: Voltage signal connection
2.2.5 Connection of a 4 – 20 mA Sensor
Normally these sensors will deliver a 4 mA signal, when the measured signal is at minimal
level. This 4 mA signal is also used as a power supply for the sensor. In this case a 2 wire
connection to the sensor is used. The 24VDC supply can be used for these sensors.
5V
1mA
1
2
3
4
5
6
to chassis
24V
1
2
+
-
Active 4-20
mA sensor
Figure 15: 4 – 20 mA Sensor connection
note: make sure that the sensor can handle the 24VDC supply.

Peekel Instruments User manual PICAS V2.6.1
Page 18 of 59
2.2.6 Connection of a 0-20mA Sensor
Connection of a current sensor (0-20 mA or 4 – 20mA) when the sensor power supply from
PICAS is not used.
5V
1mA
1
2
3
4
5
6
to chassis
I
Figure 16: 0 – 20 mA Sensor connection
2.2.7 Connection of a Thermocouple element
A thermocouple element is connected like a voltage signal. For the compensation of the
cold junction at the screw terminals, the first channel of the CA4AI card is used. With this
channel the temperature of the junction must be measured, with a PT100 element.
5V
1mA
1
2
3
4
5
6
to chassis
V
Figure 17: Thermocouple connection

Peekel Instruments User manual PICAS V2.6.1
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2.3 Outputs
2.3.1 Combined analog output
pin 1 : Amplifier output 1
pin 2 : Amplifier output 2
pin 3 : Amplifier output 3
pin 4 : Amplifier output 4
pin 5 : Screen gnd
pin 6 : Ground
pin 7 : Ground
pin 8 : Ground
pin 9 : Ground
Through these connections, all 4 outputs (0...+/-10 V)
are continuously available. They might be used for connecting an external multiplexer, or
other device.
Cable screen should be connected to the connector case. Do not connect to pin 5!
Individual analog outputs:
For each Carrier frequency channel, the same output voltage (0... +/-10 V) is also available
on a BNC connectors at the rear of the cabinet.
Note: The Channels from the CA4AI card do not have an analog output. Not on the board
itself and not on this combined analog output connector!!
2.3.2 Digital Outputs
Connection diagram for
channel 1. The other channels are
identical, just use other pins:
2.3.3 Digital Inputs
On the same connector 2 digital
inputs are present. These
inputs are connected through
optocouplers to the processor.
Pin 12
Pin 11
5 – 24VDC
Imax = 2 mA
V
Input 2
Pin 9
Pin 10
Input 1
LOAD
AC or DC
max 48V
Pin 1
Pin 2
Imax = 300 mA
V

Peekel Instruments User manual PICAS V2.6.1
Page 20 of 59
2.4 Communication ports
2.4.1 RS232 interface
This port can be used to connect a COM-port of a PC. The Baudrate can be selected with
System Menu 02.
pin 1 : -
pin 2 : RXD
pin 3 : TXD
pin 4 : -
pin 5 : Ground
pin 6 : -
pin 7 : -
pin 8 : -
pin 9 : -
2.4.2 USB
This interface is only present on the fast controller. It is used for data communication
between the PICAS and the PC.
The PICAS is a USB device, and the USB connector on the back side is a type B
connector. It is a USB V1.1 interface.
When the PICAS has a USB interface, only 1 RS485 connector is present.